阅读说明：本技术 功率控制电路 (Power control circuit ) 是由 李东岳 叶嘉蒙 彭凤雄 董铸祥 阮正坤 孟浩 钱永学 蔡光杰 黄鑫 于 2021-08-23 设计创作，主要内容包括：根据本发明的实施例,提供了一种功率控制电路,包括：反馈放大器,其接收输入控制电压V1和来自其输出端的反馈电压,并且被配置为连接到镜像电流电路；控制开关电路,其接收输入控制电压V1并且被连接到镜像电流电路,以提供电阻随所述输入控制电压V1变化的电路；镜像电流电路,其连接到反馈放大器的输出端、控制开关电路以及输出电压生成电路,以根据输入控制电压V1和控制开关电路的电阻提供镜像电流；输出电压生成电路,其连接到镜像电流电路,以根据接收到的镜像电流来提供变缓后的输出控制电压。(According to an embodiment of the present invention, there is provided a power control circuit including: a feedback amplifier receiving an input control voltage V1 and a feedback voltage from its output and configured to be connected to a mirror current circuit; a control switch circuit receiving an input control voltage V1 and connected to a mirror current circuit to provide a circuit with a resistance that varies with the input control voltage V1; a mirror current circuit connected to the output terminal of the feedback amplifier, the control switch circuit, and the output voltage generating circuit to supply a mirror current according to the input control voltage V1 and the resistance of the control switch circuit; and an output voltage generation circuit connected to the mirror current circuit to provide the output control voltage after the ramp according to the received mirror current.)

1. A power control circuit, comprising:

a feedback amplifier receiving an input control voltage V1 and a feedback voltage from its output and configured to be connected to a mirror current circuit;

a control switch circuit receiving an input control voltage V1 and connected to a mirror current circuit to provide a circuit with a resistance that varies with the input control voltage V1;

a mirror current circuit connected to the output terminal of the feedback amplifier, the control switch circuit, and the output voltage generating circuit to supply a mirror current according to the input control voltage V1 and the resistance of the control switch circuit;

and an output voltage generation circuit connected to the mirror current circuit to provide the output control voltage after the ramp according to the received mirror current.

2. The power control circuit of claim 1, wherein the feedback amplifier comprises an operational amplifier circuit, and

wherein the operational amplifier is configured such that a + input terminal of the operational amplifier is connected to an input control voltage V1, and such that a-input terminal of the operational amplifier is connected to an output terminal of the operational amplifier through the mirror current circuit.

3. The power control circuit of claim 1, wherein the control switch circuit comprises: an N-type pipe N1 used as a switch, a resistor R1, and a resistor R2, wherein,

the gate of the N-type tube N1 is connected to an input control voltage V1, the N1 of the N-type tube is controlled to be switched on and off by inputting a control voltage V1, the source of the N1 of the N is connected to one end of a resistor R1, and the drain of the N1 of the N is connected to the other end of a resistor R1 so as to be connected with a mirror current circuit;

the resistor R2 is configured in series with the resistor R1, one end thereof is connected to the resistor R1, and the other end thereof is grounded.

4. The power control circuit of claim 3, wherein the control switch circuit further comprises a filter network circuit configured to be connected between the gate of the N-type transistor N1 and the input control voltage V1 to filter out fluctuations in the input control voltage V1.

5. The power control circuit of claim 4, wherein the filter network circuit comprises a low pass filter, and

the low-pass filter comprises a resistor R3 and a capacitor C1, one end of the resistor R3 is connected to an input control voltage V1, the other end of the resistor R3 is connected to the capacitor C1 and the grid of the N-type tube N1, one end of the capacitor C1 is connected to the resistor R3, and the other end of the capacitor C1 is grounded.

6. The power control circuit of claim 1, wherein the mirror current circuit comprises a P-type pipe P1 and a P-type pipe P2,

wherein sources of the P-type pipes P1 and P2 are commonly connected to a power supply voltage, gates of the P-type pipes P1 and P2 are commonly connected to an output terminal of the feedback amplifier a, and a drain of the P-type pipe P1 is connected to the control switch circuit and a drain of the P-type pipe P2 is connected to an output voltage generating circuit to output an output control voltage.

7. The power control circuit of claim 1 wherein the output voltage generation circuit comprises a resistor R4, wherein the resistor R4 has one end connected to the mirror current circuit to output an output control voltage and the other end connected to ground.

8. The power control circuit of claim 7 wherein the output voltage generation circuit further comprises a supplemental current source I1, wherein one terminal of supplemental current source I1 is connected to the supply voltage and the other terminal is connected in parallel with resistor R4 to reduce the input control voltage V1 for turning on the power amplifier.

9. The power control circuit of any of claims 1-8,

wherein, when the input control voltage V1 is low and the N-type tube N1 is disconnected, the output control voltage is

10. The power control circuit of any of claims 1-8,

wherein, when the input control voltage V1 is increased and the N-type tube N1 is conducted, the output control voltage isWherein R is_N1Is the on-resistance of N-type tube N1.

11. The power control circuit of any of claims 1-8,

wherein, when the input control voltage V1 gradually increases to more than 1V, the output voltage V2 is

Technical Field

The present disclosure relates to a power control circuit, and more particularly, to a power control circuit that allows a power curve with a control voltage to be gradually changed at a medium or low power.

Background

The rf power amplifier often needs a control voltage to control the output power, i.e. as the control voltage increases, the power also increases. The control voltage is typically linearly increasing from 0V up to 2V, stepped with a fixed accuracy. However, the power, especially the output power of a GMSK saturated power amplifier, generally does not increase linearly with the increase of the control voltage, generally increases faster when the power is smaller, and increases slowly when the power is large and approaches the vicinity of the saturated power. This results in a very steep power-versus-control voltage curve at medium and low power levels, which results in a reduction in power control accuracy.

Disclosure of Invention

The present disclosure provides a power control circuit in which power changes more slowly at medium and small power with a control voltage, and which does not affect the magnitude of the maximum output power at high power.

According to an embodiment of the present invention, there is provided a power control circuit including: a feedback amplifier receiving an input control voltage V1 and a feedback voltage from its output and configured to be connected to a mirror current circuit; a control switch circuit receiving an input control voltage V1 and connected to a mirror current circuit to provide a circuit with a resistance that varies with the input control voltage V1; a mirror current circuit connected to the output terminal of the feedback amplifier, the control switch circuit, and the output voltage generating circuit to supply a mirror current according to the input control voltage V1 and the resistance of the control switch circuit; and an output voltage generation circuit connected to the mirror current circuit to provide the output control voltage after the ramp according to the received mirror current.

According to an embodiment of the present invention, there is provided a power control circuit, wherein the feedback amplifier includes an operational amplifier circuit, and wherein the operational amplifier is configured such that a + input terminal of the operational amplifier is connected to an input control voltage V1, and such that a-input terminal of the operational amplifier is connected to an output terminal of the operational amplifier through the mirror current circuit.

According to an embodiment of the present invention, there is provided a power control circuit, wherein the control switch circuit includes: an N-type pipe N1, a resistor R1 and a resistor R2 used as a switch, wherein a gate of the N-type pipe N1 is connected to an input control voltage V1, the on and off of the N-type pipe N1 are controlled by an input control voltage V1, a source of the N-type pipe N1 is connected to one end of the resistor R1, and a drain thereof is connected to the other end of the resistor R1 to be connected with a mirror current circuit; the resistor R2 is configured in series with the resistor R1, one end thereof is connected to the resistor R1, and the other end thereof is grounded.

According to an embodiment of the present invention, there is provided a power control circuit, wherein the control switch circuit further includes a filter network circuit configured to be connected between the gate of the N-type transistor N1 and the input control voltage V1 to filter fluctuations of the input control voltage V1.

According to an embodiment of the present invention, there is provided a power control circuit, wherein the filter network circuit includes a low pass filter, and wherein the low pass filter includes a resistor R3 and a capacitor C1, one end of the resistor R3 is connected to an input control voltage V1 and the other end thereof is connected to a capacitor C1 and to the gate of the N-type tube N1, one end of the capacitor C1 is connected to the resistor R3 and the other end thereof is grounded.

According to an embodiment of the present invention, there is provided a power control circuit, wherein the mirror current circuit includes a P-type pipe P1 and a P-type pipe P2, wherein sources of the P-type pipes P1 and P2 are commonly connected to a power supply voltage, gates of the P-type pipes P1 and P2 are commonly connected to an output terminal of the feedback amplifier a, and a drain of the P-type pipe P1 is connected to the control switch circuit and a drain of the P-type pipe P2 is connected to an output voltage generation circuit to output an output control voltage.

According to an embodiment of the present invention, there is provided a power control circuit, wherein the output voltage generation circuit includes a resistor R4, wherein one end of the resistor R4 is connected to the mirror current circuit to output an output control voltage, and the other end thereof is grounded.

According to an embodiment of the present invention, there is provided a power control circuit, wherein the output voltage generation circuit further includes a supplementary current source I1, wherein one end of the supplementary current source I1 is connected to a power supply voltage, and the other end thereof is connected in parallel with a resistor R4 to lower an input control voltage V1 for turning on a power amplifier.

According to an embodiment of the present invention, there is provided a power control circuit in which, when an input control voltage V1 is low and an N-type pipe N1 is disconnected, an output control voltage is

According to an embodiment of the present invention, there is provided a power control circuit in which, when an input control voltage V1 increases and an N-type pipe N1 is turned on, an output control voltage isWherein R is_N1Is the on-resistance of N-type tube N1.

According to an embodiment of the present invention, there is provided a power control circuit, wherein, when the input control voltage V1 gradually increases to more than 1V, the output voltage V2 is

According to the embodiment of the invention, the curve of the medium and small power changing along with the control voltage is enabled to become gentle, and meanwhile, the size of the maximum output power is not influenced.

Drawings

FIG. 1 is a schematic diagram illustrating a power control circuit for slowing down the power versus control voltage curve at medium and small powers in accordance with an embodiment of the present invention;

FIG. 2 is a schematic diagram showing a power control circuit for slowing down the power versus control voltage curve at medium and small powers according to an embodiment of the present invention;

FIG. 3 is a schematic diagram illustrating a power control circuit and a power amplifier circuit according to an embodiment of the invention; and

fig. 4 is a graph of output power as a function of control voltage according to an embodiment of the disclosure.

Detailed Description

Before proceeding with the following detailed description, it may be advantageous to set forth definitions of certain words and phrases used throughout this patent document. The terms "couple," "connect," and their derivatives refer to any direct or indirect communication between two or more elements, whether or not those elements are in physical contact with one another. The terms "transmit," "receive," and "communicate," as well as derivatives thereof, encompass both direct and indirect communication. The terms "include" and "comprise," as well as derivatives thereof, mean inclusion without limitation. The term "or" is inclusive, meaning and/or. The phrase "associated with … …" and derivatives thereof means including, included within … …, interconnected, contained within … …, connected or connected with … …, coupled or coupled with … …, in communication with … …, mated, interwoven, juxtaposed, proximate, bound or bound with … …, having an attribute, having a relationship or having a relationship with … …, and the like. The term "controller" refers to any device, system, or part thereof that controls at least one operation. Such a controller may be implemented in hardware, or a combination of hardware and software and/or firmware. The functionality associated with any particular controller may be centralized or distributed, whether locally or remotely. The phrase "at least one of, when used with a list of items, means that a different combination of one or more of the listed items can be used and only one item in the list may be required. For example, "at least one of A, B, C" includes any one of the following combinations: A. b, C, A and B, A and C, B and C, A and B and C.

Definitions for other specific words and phrases are provided throughout this patent document. Those of ordinary skill in the art should understand that in many, if not most instances, such definitions apply to prior, as well as future uses of such defined words and phrases.

In this patent document, the application combination of transform blocks and the division levels of sub-transform blocks are only for illustration, and the application combination of transform blocks and the division levels of sub-transform blocks may have different manners without departing from the scope of the present disclosure.

Figures 1 through 4, discussed below, and the various embodiments used to describe the principles of the present disclosure in this patent document are by way of illustration only and should not be construed in any way to limit the scope of the disclosure. Those skilled in the art will understand that the principles of the present disclosure may be implemented in any suitably arranged system or device.

Fig. 1 is a schematic diagram showing a power control circuit for making a power variation curve with a control voltage gentle at medium and small powers according to an embodiment of the present invention.

Referring to fig. 1, a power control circuit 100 includes a feedback amplifier a, a control switch circuit, a current mirror circuit, and an output voltage generation circuit. The feedback amplifier a may be formed by an operational amplifier that receives the input control voltage V1 and feedback from its output to provide a stable input control voltage relative to the input control voltage V1. And the control switch circuit adjusts the on and off of the switch according to the change of the input voltage so as to adjust the current in the control switch circuit. A current mirror circuit that provides a mirror current of the current in the control switch circuit by mirroring the current in the control switch circuit. An output voltage generation circuit configured to provide the output voltage after the slowing according to the mirror current.

Specifically, in fig. 1, the + input terminal of the operational amplifier a is connected to the input control voltage V1, and the output terminal thereof is connected to the gate of the P-type pipe P1 in the mirror current circuit to be feedback-connected back to the-input terminal of the operational amplifier a through the P-type pipe P1.

The control switch circuit comprises resistors R1 and R2, an N-type tube N1 and a filter network circuit. In which a resistor R1 is connected in parallel with N-type tube N1, one end thereof is connected to the-input terminal of amplifier a, the drain terminal of P-type tube and the drain of N-type tube N1, and the other end thereof is connected to a resistor R2 and the source of N-type tube N1. One end of the resistor R2 is connected to the resistor R1, and the other end thereof is grounded. An N-type pipe N1 is connected in parallel with the resistor R1, and the gate of the N-type pipe N1 is connected to the filter network circuit to be connected to the input control voltage V1 through the filter network circuit.

The mirror current circuit includes a P-type tube P1 and a P-type tube P2. Wherein the sources of P-type pipes P1 and P2 are commonly connected to a power supply voltage, the gates of P-type pipes P1 and P2 are commonly connected to the output terminal of the feedback amplifier a, and the drain of P-type pipe P1 is connected to the drain of N-type pipe N1 and the drain of P-type pipe P2 is connected to an output voltage output port.

The output voltage generating circuit includes a resistor R4. Among them, the resistor R4 has one end connected to the output voltage output port and the other end grounded.

According to an embodiment of the present disclosure, the output voltage generation circuit may further include a supplementary current source I1. Therein, the supplementary current source I1 has one end connected to the power supply voltage and the other end connected to the resistor R4 and to the output voltage output port. Since the input control voltage V1 is also used to turn on the power amplifier, (e.g., turn on the power amplifier at 0.16V), in order to prevent the output control voltage V2 curve from slowing down and causing the power amplifier turn-on voltage to be too large at low power, the supplemental current source I1 is added to ensure that the power amplifier turn-on voltage is not too large.

According to an embodiment of the present disclosure, when the input control voltage V1 is low (e.g., about 0.8V or less), the N-type pipe N1 serving as a control switch is turned off, and the current of the P-type pipe P1 is the result of dividing the input control voltage V1 by the sum of the resistor R1 and the resistor R2. Wherein the resistance R1 and the resistance R2 are large resistances of about 2K-10 Kohm. This current is mirrored through P-type tube P2, and after being added to the complementary current I1, multiplied by resistor R4 to obtain the output control voltage V2, which is expressed as the following equation (1):

according to the embodiment of the present disclosure, when the input control voltage V1 continues to increase (e.g., about 0.8-1.0V), the N-type tube N1 serving as the control switch is gradually turned on, and the on-resistance R of the N-type tube N1_N1Gradually decreases. The output control voltage V2 at this time is represented by the following equation (2):

according to the embodiment of the present disclosure, when the input control voltage V1 continues to increase above 1V, the on-resistance R of the N-type pipe N1 used as the control switch_N1The value of (b) is small compared with the value of the resistor R1, so that the resistance of the two parallel resistors can be ignored. Therefore, the expression of the above expression output control voltage V2 becomes (3):

due to the on-resistance R of the N-type tube N1_N1Is continuously varied, the output control voltage V2 does not abruptly change during the change according to the formula (1) to the formula (3), thereby preventing abrupt changes in power.

Fig. 2 shows a schematic diagram of a power control circuit for slowing down the power versus control voltage curve at medium and small power according to an embodiment of the present invention.

In fig. 2, the filter network circuit includes a low pass filter configured with a resistor R3 and a capacitor C1. Among them, the gate of the N-type tube N1 is connected to one end of a resistor R3 and a capacitor C1, and the other end of the resistor R3 is connected to the input control voltage V1, and the other end of the capacitor C1 is connected to ground. In addition, a description similar to that in fig. 1 is omitted.

According to the embodiment of the present disclosure, the resistor R3 and the capacitor C1 constitute a low-pass filter of the input control voltage V1, which is used for filtering fluctuations of the input control voltage, thereby preventing the accuracy of the output control voltage V2 from being affected.

Fig. 3 is a schematic diagram showing a power control circuit and a power amplifier for making a variation curve of power with a control voltage gentle at medium and small power according to an embodiment of the present invention, and fig. 4 is a curve of output power with a control voltage according to an embodiment of the present disclosure.

Referring to fig. 3, an input control voltage V1 is processed through a power control circuit into an output control voltage V2. The output control voltage V2 is input to the power amplifier for controlling the magnitude of the output power. Referring to fig. 4, in which the horizontal axis represents the input control voltage V1 and the vertical axis represents the output power Pout of the power amplifier. Curve 1 represents the output power as a function of the input control voltage V1 before application of the present disclosure, and it can be seen that at medium and low powers the curve is very steep. Curve 2 represents the output power as a function of the input control voltage V1 after application of the present disclosure, and it can be seen that at medium and low powers the curve is significantly slowed down, but the power at maximum power remains unchanged.

The text and drawings are provided as examples only to aid in understanding the present disclosure. They should not be construed as limiting the scope of the disclosure in any way. While certain embodiments and examples have been provided, it will be apparent to those skilled in the art, based on the disclosure herein, that changes can be made in the embodiments and examples shown without departing from the scope of the disclosure.

According to an embodiment of the present invention, a power control circuit for slowing down power changes at medium and small power is provided, that is, the present invention modifies the control voltage to make it slow down in the medium and small power stage (in the range where the voltage is relatively low). Meanwhile, in order to ensure that the maximum value of the control voltage, namely the maximum value of the output power of the power amplifier, is not influenced by the modification, the embodiment of the invention ensures that the modified control voltage output finally reaches the original maximum value when the control voltage is high.

Although the present disclosure has been described with exemplary embodiments, various changes and modifications may be suggested to one skilled in the art. The present disclosure is intended to embrace such alterations and modifications as fall within the scope of the appended claims.

None of the description in this specification should be read as implying that any particular element, step, or function is an essential element which must be included in the claim scope. The scope of patented subject matter is defined only by the claims.