阅读说明：本技术 一种可控制偏置电路及功率放大器 (Controllable bias circuit and power amplifier ) 是由 张海涛 张泽洲 许育森 谢善谊 刘雨非 于 2021-09-08 设计创作，主要内容包括：本发明公开了一种可控制偏置电路及功率放大器,包括逻辑控制模块、输出电压控制模块、输出稳压模块和射频偏置输出模块,其中,所述逻辑控制模块与逻辑控制输入信号源连接,提供可控的逻辑控制信号；所述输出电压控制模块与所述逻辑控制模块和基准电压源连接,根据所述的逻辑控制信号,调整所述输出电压控制模块输出控制电压；所述射频偏置输出模块与所述输出电压控制模块连接,受控于所述控制电压以输出射频偏置电压；所述输出稳压模块与所述射频偏置输出模块连接,用于稳定射频偏置电压。因此,让功率放大器工作在不同的偏置电路提供的不同偏置电压下,针对功率放大应用的不同优化指标,调整同一功放的性能参数,实现不同的优化。(The invention discloses a controllable bias circuit and a power amplifier, which comprise a logic control module, an output voltage stabilizing module and a radio frequency bias output module, wherein the logic control module is connected with a logic control input signal source and provides a controllable logic control signal; the output voltage control module is connected with the logic control module and the reference voltage source and adjusts the output control voltage of the output voltage control module according to the logic control signal; the radio frequency bias output module is connected with the output voltage control module and is controlled by the control voltage to output a radio frequency bias voltage; the output voltage stabilizing module is connected with the radio frequency bias output module and used for stabilizing the radio frequency bias voltage. Therefore, the power amplifier works under different bias voltages provided by different bias circuits, and the performance parameters of the same power amplifier are adjusted according to different optimization indexes of power amplification application, so that different optimizations are realized.)

1. A controllable bias circuit is characterized by comprising a logic control module, an output voltage stabilizing module and a radio frequency bias output module, wherein the logic control module is connected with a logic control input signal source and provides a controllable logic control signal; the output voltage control module is connected with the logic control module and adjusts the output control voltage of the output voltage control module according to the logic control signal; the radio frequency bias output module is connected with the output voltage control module and is controlled by the control voltage to output a radio frequency bias voltage; the output voltage stabilizing module is connected with the radio frequency bias output module and used for stabilizing the radio frequency bias voltage.

2. The controllable bias circuit according to claim 1, wherein the logic control module comprises a first control transistor and a first impedance unit, a first terminal of the first control transistor is connected to a logic control input signal source, a second terminal of the first control transistor is connected to a first terminal of the first impedance unit, and a third terminal of the first control transistor is connected to ground.

3. The controllable bias circuit of claim 2, wherein the output voltage control module comprises a reference voltage source connected to the second terminal of the first impedance unit.

4. The controllable bias circuit of claim 3, wherein the output voltage control module further comprises a second impedance unit, a first terminal of the second impedance unit being connected to a reference voltage source, and a second terminal of the second impedance unit being connected to a second terminal of the first impedance unit.

5. The controllable bias circuit according to claim 4, wherein the RF bias output module comprises a third control transistor, a first terminal of the third control transistor is connected to the second terminal of the first impedance unit, a second terminal of the third control transistor is connected to a power supply voltage source, and a third terminal of the third control transistor outputs the RF bias voltage.

6. The controllable bias circuit of claim 5, wherein the RF bias output module further comprises a third impedance unit, a first terminal of the third impedance unit is connected to a supply voltage source, and a second terminal of the third impedance unit is connected to a second terminal of the third control transistor.

7. The controllable bias circuit according to claim 6, wherein the output regulator module comprises a second control transistor and a fourth impedance unit, a first terminal and a second terminal of the second control transistor are connected to a first terminal of the fourth impedance unit, a second terminal of the fourth impedance unit is connected to a third terminal of the third control transistor, and a third terminal of the second control transistor is grounded.

8. The controllable bias circuit according to claim 7, wherein the first, second, third and fourth impedance units each comprise at least one resistor in series and/or in parallel, wherein the first and fourth impedance units each have a resistance range >0 Ω; the resistance ranges of the second impedance unit and the third impedance unit are larger than or equal to 0 omega.

9. The controllable bias circuit of claim 7, wherein the first control transistor, the second control transistor, and the third control transistor comprise transistors or fets, wherein the fets comprise jfets and MOS transistors; the triode comprises an NPN triode and a PNP triode.

10. A power amplifier further comprising a master control module and a power amplifier module, wherein the master control module generates the logic control input signal source to change the controllable bias circuit according to any one of claims 1 to 9, so that the power amplifier module operates in different states, and adjusts the rf signal to match the optimal operating state for a specific application environment.

Technical Field

The present invention relates to the field of communications technologies, and in particular, to a controllable bias circuit and a power amplifier.

Background

Devices such as mobile phones, wireless routers and wireless network cards are intelligent data terminals which are difficult for modern people to leave, and a power amplifier directly determines the distance, signal quality, power consumption and standby time of wireless communication of the devices. Different radio frequency performance needs optimization of different indexes, and different bias circuit requirements often exist. For example, for a wireless router, under the condition of power supply, the performance and the coverage are used as main indexes, and the efficiency of a power amplifier is not pursued to reach the optimum; in the case of WiFi, however, only personal perimeter networks need to be overlaid, targeting less power and optimizing efficiency.

The partial radio frequency Power amplifier also adopts technologies such as Envelope Tracking (ET), Average Power Tracking (APT), Enhanced Power Tracking (EPT) and the like, and can achieve the purpose of improving the Power amplifier PAE by adjusting different Power supply voltage values under different output powers. These techniques require a sampling feedback of the RF signal and control of the power supply voltage value via the power management chip, which requires a more complex circuit design and other supporting chips.

The existing power amplification application needs different optimization indexes, when power amplification performance parameters are adjusted, a plurality of power amplifiers are often needed to provide a plurality of bias voltages, and hardware devices such as a radio frequency switch and the like need to be designed, so that the hardware cost is increased.

Disclosure of Invention

In view of the above-mentioned drawbacks of the prior art, an object of the present invention is to provide a controllable bias circuit and a power amplifier, which can enable the power amplifier to operate under different bias voltages provided by different bias circuits through logic control voltage, adjust performance parameters of the same power amplifier for different optimization indexes (such as high linearity optimization or high PAE efficiency optimization) of power amplification application, implement different optimizations, replace the effect that can be achieved by at least two independent power amplifiers before, and save a switching radio frequency switch, thereby greatly saving cost.

In order to achieve the above object, the present invention provides a controllable bias circuit, which includes a logic control module, an output voltage stabilization module, and a radio frequency bias output module, wherein the logic control module is connected to a logic control input signal source for providing a controllable logic control signal; the output voltage control module is connected with the logic control module and the reference voltage source and adjusts the output control voltage of the output voltage control module according to the logic control signal; the radio frequency bias output module is connected with the output voltage control module and is controlled by the control voltage to output a radio frequency bias voltage; the output voltage stabilizing module is connected with the radio frequency bias output module and used for stabilizing the radio frequency bias voltage.

Preferably, the logic control module includes a first control transistor and a first impedance unit, a first end of the first control transistor is connected to a logic control input signal source, a second end of the first control transistor is connected to a first end of the first impedance unit, and a third end of the first control transistor is grounded.

Preferably, the output voltage control module includes a reference voltage source connected to the second end of the first impedance unit.

Preferably, the output voltage control module further includes a second impedance unit, a first end of the second impedance unit is connected to the reference voltage source, and a second end of the second impedance unit is connected to the second end of the first impedance unit.

Preferably, the rf bias output module includes a third control transistor, a first end of the third control transistor is connected to the second end of the first impedance unit, a second end of the third control transistor is connected to a power supply voltage source, and a third end of the third control transistor outputs an rf bias voltage.

Preferably, the rf bias output module further includes a third impedance unit, a first end of the third impedance unit is connected to a power supply voltage source, and a second end of the third impedance unit is connected to a second end of the third control transistor.

Preferably, the output voltage stabilizing module includes a second control transistor and a fourth impedance unit, a first end and a second end of the second control transistor are connected and then connected to a first end of the fourth impedance unit, a second end of the fourth impedance unit is connected to a third end of the third control transistor, and a third end of the second control transistor is grounded.

Preferably, the first impedance unit, the second impedance unit, the third impedance unit and the fourth impedance unit each include at least one resistor connected in series and/or in parallel, wherein the resistance ranges of the first impedance unit and the fourth impedance unit are each >0 Ω; the resistance ranges of the second impedance unit and the third impedance unit are larger than or equal to 0 omega.

Preferably, the first control transistor, the second control transistor and the third control transistor include any one of a triode and a field effect transistor, wherein the field effect transistor includes a junction field effect transistor and a MOS transistor; the triode comprises an NPN triode and a PNP triode.

Based on the same technical scheme concept, the invention also provides a power amplifier, which further comprises a main control module and a power amplifier module, wherein the main control module generates the logic control input signal source and changes the controllable bias circuit, so that the power amplifier module works in different states, and radio frequency signals are adjusted according to specific application environments to match the optimal working state.

Compared with the prior art, the invention has the beneficial effects that:

1. a controllable bias circuit comprises a logic control module, an output voltage stabilizing module and a radio frequency bias output module, wherein the logic control module is connected with a logic control input signal source and provides a controllable logic control signal; the output voltage control module is connected with the logic control module and the reference voltage source and adjusts the output control voltage of the output voltage control module according to the logic control signal; the radio frequency bias output module is connected with the output voltage control module and is controlled by the control voltage to output radio frequency bias voltage; the output voltage stabilizing module is connected with the radio frequency bias output module and used for stabilizing the radio frequency bias voltage. Therefore, the power amplifier works under different bias voltages provided by different bias circuits, and the performance parameters of the same power amplifier are adjusted according to different optimization indexes of power amplification application, so that different optimizations are realized.

2. The power amplifier also comprises a main control module and a power amplifier module, wherein the main control module generates a logic control input signal source and changes a controllable bias circuit, so that the power amplifier module works in different states, and radio frequency signals are adjusted according to specific application environments to be matched with the optimal working state. Specifically, when the logic control signal provided by the logic control input signal source is at a high level, the rf bias voltage output on the emitter of the third control transistor may be made lower, so that the power amplifier collocated therewith operates in a class-c amplification mode to form a Doherty structure, and the power amplifier is controlled to operate in a high-efficiency mode; when the logic control signal provided by the logic control input signal source is at a low level, the voltage output from the emitter of the third control transistor to the base of the amplifying transistor of the power amplifier is higher, and the power amplifier matched with the emitter of the third control transistor can be controlled to work in a class AB amplifier mode, namely a high-linearity working mode.

Drawings

In order to more clearly illustrate the solution of the present invention, the drawings used in the description of the embodiments of the present invention will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without inventive labor.

FIG. 1 is a circuit schematic of a controllable bias circuit provided by the present invention;

fig. 2 is a circuit principle of a power amplifier according to the present invention.

Description of reference numerals:

10. a logic control module; 20. an output voltage control module; 30. an output voltage stabilization module; 40. a radio frequency bias output module; 50. a main control module; 60. a power amplifier module;

q1, a first control transistor; q2, a second control transistor; q3, a third control transistor; r1, a first impedance unit; r2, a second impedance unit; r3, third impedance unit; r4, fourth impedance unit.

Detailed Description

The following detailed description of the preferred embodiments of the present invention, taken in conjunction with the accompanying drawings, will make the advantages and features of the invention easier to understand by those skilled in the art, and thus will clearly and clearly define the scope of the invention. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without any inventive step, are within the scope of the present invention.

The terms "comprising" and "having," and any variations thereof, in the description and claims of this invention and the description of the above figures, are intended to cover non-exclusive inclusions. The terms "first," "second," and the like in the description and in the claims, or in the drawings, are used for distinguishing between different objects and not necessarily for describing a particular sequential order. In the description and claims of the present invention or the drawings, directional terms such as "upper", "lower", "left", "right", "front", "rear", "side", and the like are used for relative positional description of the drawings, and are not used to describe a specific order of actual products.

Referring to fig. 1, an embodiment of the present invention provides a controllable bias circuit, which includes a logic control module 10, an output voltage control module 20, an output voltage stabilizing module 30, and a radio frequency bias output module 40, wherein the logic control module 10 is connected to a logic control input signal source Vin to provide a controllable logic control signal; the output voltage control module 20 is connected with the logic control module 10, and adjusts the output control voltage of the output voltage control module 20 according to the logic control signal; the radio frequency bias output module 40 is connected with the output voltage control module 20 and is controlled by the control voltage to output a radio frequency bias voltage; the output voltage stabilizing module 30 is connected to the rf bias output module 40 for stabilizing the rf bias voltage.

In one embodiment, the logic control module 10 includes a first control transistor Q1 and a first impedance unit R1, a first terminal of the first control transistor Q1 is connected to the logic control input signal source Vin, a second terminal of the first control transistor Q1 is connected to a first terminal of the first impedance unit R1, and a third terminal of the first control transistor Q1 is grounded. The first control transistor Q1 functions as a switch, and is capable of controlling the output current signal based on the logic control signal input from the logic control input signal source Vin. And the first resistance unit R1 converts the current of the control output into an output voltage signal. Further, the first control transistor Q1 adopts any one of a triode or a field effect transistor, wherein the field effect transistor includes a junction field effect transistor and a MOS transistor; the triode comprises an NPN triode and a PNP triode. The first impedance unit R1 includes at least one resistor connected in series and/or in parallel, wherein the resistance range of the first impedance unit R1 is >0 Ω, that is, the first impedance unit R1 may be a resistor, or a plurality of resistors connected in series and/or in parallel, and is not limited herein.

For convenience of understanding, the present embodiment is described by taking an example in which the first control transistor Q1 adopts a PNP transistor, and the first resistance unit R1 adopts a single first resistor R1. That is, the base of the first PNP transistor Q1 is connected to the logic control input signal source Vin, the collector of the first PNP transistor Q1 is connected to the first end of the first resistor R1, and the emitter of the first PNP transistor Q1 is grounded.

In one embodiment, the output voltage control module 20 includes a reference voltage source Vref, and the reference voltage source Vref is connected to the second terminal of the first impedance unit R1. For ease of understanding, a reference voltage source Vref is connected to a second terminal of the first resistor R1. The voltage value of the reference voltage source Vref is adjusted according to the actual circuit requirements, and is not limited herein. It should be noted that the reference voltage source Vref may be an existing voltage source, or may be designed according to actual circuit requirements, and belongs to the prior art, and is not specifically developed here. The reference voltage source Vref adjusts an output control voltage according to a logic control signal.

In addition, the output voltage control module 20 further includes a second impedance unit R2, wherein the resistance range of the second impedance unit R2 is ≧ 0 Ω, that is, the resistance of the second impedance unit R2 may be 0 Ω or greater than 0 Ω. When the resistance of the second resistance unit R2 is 0 Ω, it corresponds to a wire. When the resistance of the second impedance unit R2 is greater than 0 Ω, the first terminal of the second impedance unit R2 is connected to the Vref, and the second terminal of the second impedance unit R2 is connected to the second terminal of the first impedance unit R1, so that the second impedance unit R2 can perform a current limiting function to protect the circuit.

It should be understood that when the resistance value of the second resistance unit R2 is greater than 0 Ω, the second resistance unit R2 includes at least one resistor connected in series and/or in parallel. That is, the second impedance unit R2 may be a resistor, or a plurality of resistors connected in series and/or in parallel, and is not limited in particular.

For understanding, the second resistance unit R2 is exemplified as the single second resistor R2 in the present embodiment. When the resistance of the second resistor R2 is greater than 0 Ω, the first terminal of the second resistor R2 is connected to the Vref, and the second terminal of the second resistor R2 is connected to the second terminal of the first resistor R1.

In an embodiment, the rf bias output module 40 includes a third control transistor Q3, a first terminal of the third control transistor Q3 is connected to the second terminal of the first impedance unit R1, a second terminal of the third control transistor Q3 is connected to the power supply voltage VCC, and a third terminal of the third control transistor Q3 outputs the rf bias voltage Vbias.

The third control transistor Q3 plays a role of signal modulation, and controls the output rf signal. Further, the third control transistor Q3 adopts any one of a triode or a field effect transistor, wherein the field effect transistor includes a junction field effect transistor and a MOS transistor; the triode comprises an NPN triode and a PNP triode.

For convenience of understanding, the third control transistor Q3 is exemplified by a PNP transistor, the base of the third PNP transistor Q3 is connected to the second terminal of the first resistor R1, the collector of the third PNP transistor Q3 is connected to the supply voltage source VCC, and the emitter of the third PNP transistor Q3 outputs the radio frequency bias voltage Vbias. The supply voltage source VCC is prior art and is not specifically developed here.

In order to match the circuit, the rf bias output module 40 further includes a third impedance unit R3, wherein the resistance of the third impedance unit R3 is greater than or equal to 0 Ω, that is, the resistance of the third impedance unit R3 may be 0 Ω or greater than 0 Ω. When the resistance of the third impedance unit R3 is 0 Ω, it corresponds to a wire. When the resistance of the third impedance unit R3 is greater than 0 Ω, the first terminal of the third impedance unit R3 is connected to the supply voltage source VCC, and the second terminal of the third impedance unit R3 is connected to the second terminal of the third control transistor Q3.

It should be understood that when the resistance value of the third resistance unit R3 is greater than 0 Ω, the third resistance unit R3 includes at least one resistor connected in series and/or in parallel. That is, the third impedance unit R3 may be a resistor, or a plurality of resistors connected in series and/or in parallel, and is not limited in particular.

To be understood, the third resistance unit R3 is exemplified as the single third resistor R3 in the present embodiment. When the resistance of the third impedance unit R3 is greater than 0 Ω, the first terminal of the third resistor R3 is connected to the supply voltage VCC, and the second terminal of the third resistor R3 is connected to the collector of the third PNP transistor Q3.

In an embodiment, the output regulator module 30 includes a second control transistor Q2 and a fourth impedance unit R4, a first terminal and a second terminal of the second control transistor Q2 are connected to a first terminal of the fourth impedance unit R4, a second terminal of the fourth impedance unit R4 is connected to a third terminal of the third control transistor Q3, and a third terminal of the second control transistor Q2 is grounded.

Wherein the second control transistor Q2 functions as a voltage regulator, and the fourth impedance unit R4 functions as a quiescent operating point provided by the second control transistor Q2. Further, the second control transistor Q2 adopts any one of a triode or a field effect transistor, wherein the field effect transistor includes a junction field effect transistor and a MOS transistor; the triode comprises an NPN triode and a PNP triode. The fourth impedance unit R4 includes at least one resistor connected in series and/or in parallel, wherein the resistance range of the fourth impedance unit R4 is >0 Ω, that is, the fourth impedance unit R4 may be a resistor, or a plurality of resistors connected in series and/or in parallel, and is not limited herein.

For convenience of understanding, the present embodiment is exemplified by the second control transistor Q2 using a PNP transistor, and the fourth impedance unit R4 using a single fourth resistor R4. The base electrode and the collector electrode of the second PNP triode Q2 are connected and then connected with the first end of the fourth resistor R4, the second end of the fourth resistor R4 is connected with the emitter electrode of the third PNP triode Q3, and the emitter electrode of the second PNP triode Q2 is grounded.

In summary, when the resistances of the second impedance unit R2 and the third impedance unit R3 are both 0 Ω, the operation principle of the controllable bias circuit is as follows: when the logic control signal provided by the logic control input signal source Vin is at a high level, the first control transistor Q1 is turned on, and the reference voltage source Vref applied to the base of the third control transistor Q3 generates a divided voltage in the first resistor R1, so that the rf bias voltage Vbias output by the emitter of the third control transistor Q3 can be made lower by adjusting the voltage value of the reference voltage source Vref, the resistance value of the first resistor R1 and the die size of the third control transistor Q3. When the logic control signal provided by the logic control input signal source Vin is at a low level, the first control transistor Q1 is turned off, and the voltage at the base of the third control transistor Q3 is the voltage of the reference voltage source Vref, compared to the case of a high level, at this time, the voltage output from the emitter of the third control transistor Q3 to the base of the power amplifier amplifying tube is higher. Therefore, the performance parameters of the same power amplifier are adjusted according to different optimization indexes applied to power amplification, and different optimizations are realized.

Based on the same technical solution concept, the present invention further provides a power amplifier, which further comprises a main control module 50 and a power amplifier module 60, wherein the main control module 50 generates a logic control input signal source to change a controllable bias circuit, so that the power amplifier module 60 operates in different states, adjusts a radio frequency signal according to a specific application environment, and matches an optimal operating state. Specifically, when the logic control signal provided by the logic control input signal source Vin is at a high level, the rf bias voltage output from the emitter of the third control transistor Q3 may be made lower, so that the power amplifier collocated therewith operates in the class-c amplification mode to form a Doherty structure, and the power amplifier is controlled to operate in the high-efficiency mode; when the logic control signal provided by the logic control input signal source Vin is at a low level, the voltage output from the emitter of the third control transistor Q3 to the base of the amplifying transistor of the power amplifier is higher, so that the power amplifier matched with the emitter of the third control transistor Q3 can be controlled to operate in the class a and b amplifier mode, i.e., the high-linearity operating mode.

The above description is only for the purpose of illustrating the technical solutions of the present invention and is not intended to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; all the equivalent structures or equivalent processes performed by using the contents of the specification and the drawings of the invention, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.