阅读说明：本技术 一种高速大电流激光器驱动电路及其芯片 (High-speed large-current laser driving circuit and chip thereof ) 是由 林福江 艾哈迈德·瓦哈巴 李喜 于 2019-11-14 设计创作，主要内容包括：本发明公开了一种高速大电流激光器驱动电路及其芯片。驱动电路包括输入级电路、预驱动电路、负电容电路、有源反向端接电路、以及一个或多个并联连接的输出级电路。电压信号由输入级电路通过输入匹配并调整后输出电压信号,再通过预驱动电路放大后输出电压信号至输出级电路,最终产生输出调制电流信号,负电容电路产生负电容来减小输出级电容的输入电容,有源反向端接电路吸收因输出不匹配而产生的反射波。本发明由于避免在输出级使用端接电阻来吸收反射波使得电路功耗显著增大,使得电路在能较好地实现输出匹配的同时功耗相比传统电路下降很多,解决高速大电流驱动电路中因输出级使用端接电阻吸收激光器反射波而造成的功耗浪费问题。(The invention discloses a high-speed large-current laser driving circuit and a chip thereof. The drive circuit includes an input stage circuit, a pre-drive circuit, a negative capacitance circuit, an active reverse termination circuit, and one or more output stage circuits connected in parallel. The voltage signal is input and matched by the input stage circuit and is adjusted to output a voltage signal, the voltage signal is amplified by the pre-drive circuit and then is output to the output stage circuit, finally, an output modulation current signal is generated, the negative capacitor circuit generates a negative capacitor to reduce the input capacitance of the output stage capacitor, and the active reverse termination circuit absorbs a reflected wave generated due to output mismatching. The invention avoids using the terminating resistor to absorb the reflected wave at the output stage, so that the power consumption of the circuit is obviously increased, the power consumption of the circuit is greatly reduced compared with the traditional circuit while the output matching can be better realized, and the problem of power consumption waste caused by using the terminating resistor to absorb the reflected wave of the laser at the output stage in the high-speed heavy-current driving circuit is solved.)

1. A high-speed high-current laser driving circuit,the circuit comprises an input stage circuit, a pre-drive circuit, a negative capacitance circuit, an output stage circuit or a plurality of output stage circuits connected in parallel; voltage signal V_IP、V_inIs input by the input stage circuit, and outputs a voltage signal V after input matching and adjustment_1IP、V_1INThen the voltage signal V is output after being amplified by the pre-driving circuit₊、V_－To the output stage circuit to finally generate an output modulation current signal I_OP、I_ONThe negative capacitance circuit generates a negative capacitance to reduce an input capacitance of the output stage capacitance; the laser driving circuit is characterized by further comprising an active reverse termination circuit;

the active reverse termination circuit includes: a pair of transistors M_7A、M_7BA pair of transistors M_6A、M_6BA pair of transistors M_5A、M_5BA pair of transistors M_S1、M_S2A pair of resistors R_3A、R_3BA pair of capacitors C₁、C₂；

Wherein the transistor M_5A、M_6A、M_7AThe grid electrodes of the grid electrodes all receive an input voltage signal V₊Transistor M_5B、M_6B、M_7BThe grid electrodes of the grid electrodes all receive an input voltage signal V_－(ii) a Transistor M_5A、M_6A、M_7AAre commonly connected to M_S2A gate electrode of (1); transistor M_5B、M_6B、M_7BAre commonly connected to M_S1A gate electrode of (1); transistor M_5A、M_5BAre all connected to a tail current source I_M1K is; transistor M_6A、M_6BAre all connected to a tail current source I_M2K is; transistor M_7A、M_7BAre all connected to a tail current source I_M3/k；

Resistance R_3A、R_3BOne end of which is connected with a voltage source V_DDResistance R_3AIs connected with the other end of the transistor M_S2Gate of (3), resistance R_3BIs connected with the other end of the transistor M_S1A gate electrode of (1); transistor M_S1、M_S2Are all connected to a voltage source V_DD(ii) a Transistor M_S1Is connected to a tail current source I_B1Transistor M_S2Is connected to a tail current source I_B2(ii) a Capacitor C₁One end of which is connected with the transistor M_S2And the other end as a current signal I_OPOutput terminal of (1), capacitor C₂One end of which is connected with the transistor M_S1And the other end as a current signal I_ONTo the output terminal of (a).

2. A high speed high current laser driver circuit according to claim 1, wherein said input stage circuit comprises: transistor M_DResistance R_INA、R_INB、R_1A、R_1BA pair of transistors M_1A、M_1B；

Wherein the transistor M_1A、M_1BRespectively receiving voltage signals V_IP、V_INTransistor M_1A、M_1BRespectively outputs a voltage signal V_1IN、V_1IPTransistor M_1A、M_1BAre all connected to a tail current source I₁；

Resistance R_INAOne end of which is connected with a voltage source V_cmResistance R_INAIs connected with the other end of the transistor M_1AA gate electrode of (1);

resistance R_INBOne end of which is connected with a voltage source V_cmResistance R_INBIs connected with the other end of the transistor M_1BA gate electrode of (1);

resistance R_1AOne end of which is connected with the transistor M_1ADrain electrode of (3), resistance R_1AIs connected with the other end of the transistor M_DSource of (1), transistor M_DBoth the grid electrode and the drain electrode of the grid electrode are connected with a voltage source V_DD；

Resistance R_1BOne end of which is connected with the transistor M_1BDrain electrode of (3), resistance R_1BIs connected with the other end of the transistor M_DOf the substrate.

3. As claimed inThe high-speed large-current laser driving circuit according to claim 2, wherein the resistor R is_INA、R_INBAll resistance values of (2) are 50 ohms.

4. A high speed high current laser driver circuit according to claim 1, wherein said pre-driver circuit comprises: a pair of transistors M_2A、M_2BA pair of resistors R_2A、R_2B；

Wherein the transistor M_2A、M_2BRespectively receiving voltage signals V_1IP、V_1INTransistor M_2A、M_2BRespectively outputs a voltage signal V_－、V₊Transistor M_2A、M_2BAre all connected to a tail current source I₂。

5. A high speed high current laser driver circuit as claimed in claim 1, wherein said negative capacitor circuit comprises: a pair of transistors M_3A、M_3BCapacitor C_c；

Wherein the transistor M_3A、M_3BRespectively receiving voltage signals V₊、V_－Transistor M_3A、M_3BRespectively outputs a voltage signal V_－、V₊Transistor M_3A、M_3BAre respectively connected to a tail current source I_3A、I_3B。

6. A high speed high current laser driver circuit according to claim 1, wherein said output stage circuit comprises: a pair of transistors M_4A、M_4BA pair of transistors M_CA、M_CB；

Wherein the transistor M_4A、M_CAThe grid electrodes of the grid electrodes all receive a voltage signal V₊Transistor M_4B、M_CBThe grid electrodes of the grid electrodes all receive a voltage signal V_－(ii) a Transistor M_4A、M_4BAre all connected to a tail current source I_M1(ii) a CrystalPipe M_4A、M_4BAre respectively connected to the current signal I_OPAnd the current signal I_ONAn output terminal of (a); transistor M_CABoth the source and the drain of (2) are connected to a current signal I_ONOf the output terminal of transistor M_CBBoth the source and the drain of (2) are connected to a current signal I_OPTo the output terminal of (a).

7. A high speed high current laser driving circuit according to claim 1, wherein when said laser driving circuit includes a plurality of output stage circuits connected in parallel, each output stage circuit of the subsequent stage is connected to the output stage circuit of the previous stage through a switching circuit, and at least one output stage circuit among the plurality of output stage circuits connected in parallel is selected by turning on and off the corresponding switching circuit.

8. A high speed high current laser driver circuit as claimed in claim 7, wherein said switching circuit comprises a transistor M_S1、M_S2Transistor M_S1、M_S2The grid electrode receives a switch control signal V_sTransistor M_S1、M_S2Are respectively connected with two input ends of corresponding output stage circuit, transistor M_S1、M_S2Respectively receive voltage signals V₊、V_－。

9. A high-speed high-current laser driving chip, which is packaged by the high-speed high-current laser driving circuit according to any one of claims 1 to 8.

10. A high speed high current laser driver chip as claimed in claim 9, wherein said chip pins comprise:

a pair of input pins for inputting a voltage signal V_IP、V_INIntroducing to the input stage circuit;

a pair of output pins for receiving the current signal I_OPOutput terminal, current signalI_ONOutput ends of the two output terminals respectively lead out an output current signal I_OP、I_ON；

The tail current source pins are used for being connected with tail current sources required by the high-speed large-current laser driving circuit;

the voltage source pins are used for accessing a voltage source required by the high-speed high-current laser driving circuit;

wherein, when the laser driving circuit comprises a plurality of output stage circuits connected in parallel, the pins of the chip further comprise:

at least one control signal pin for receiving at least one control signal for selecting at least one output stage circuit among a plurality of output stage circuits connected in parallel.

Technical Field

The invention relates to a driving circuit and a driving chip in the field of wireless communication electronic systems, in particular to a high-speed large-current laser driving circuit and a high-speed large-current laser driving chip.

Background

With the rapid development of communication networks, optical fiber communication networks with high bandwidth and low loss are increasingly required to be used in the whole communication networks, and a laser driving circuit is the most critical circuit in an optical emission chip in the whole optical fiber communication system. The bandwidth of the driving circuit and the magnitude of the current that can be modulated have a significant impact on the quality of the output optical signal, and the driving circuit must have sufficient bandwidth to ensure that the laser can operate normally at a high rate without Inter-symbol Interference (ISI), and must have a certain gain to obtain a modulation current large enough to ensure that the laser can operate with a large enough extinction ratio.

Due to the mismatch between the internal resistance of the laser and the transmission line impedance of the PCB board, a termination device (usually a passive on-chip resistor) is usually required inside the laser driver circuit to absorb the signal reflected from the laser. If the terminating resistor, the internal resistance of the laser and the impedance of the transmission line are perfectly matched, the reflected signal can be completely absorbed, but half of the output current is wasted, and large power consumption is wasted.

Disclosure of Invention

The invention provides a high-speed large-current laser driving circuit and a high-speed large-current laser driving chip, aiming at solving the problem of power consumption waste caused by the fact that a termination resistor is used by an output stage to absorb reflected waves of a laser in the high-speed large-current driving circuit.

In order to achieve the purpose, the invention adopts the following technical scheme: a high-speed large-current laser driving circuit comprises an input stage circuit, a pre-driving circuit, a negative capacitor circuit, an active reverse termination circuit and an output stage circuit or a plurality of output stage circuits connected in parallel; voltage signal V_IP、V_inIs input by the input stage circuit, and outputs a voltage signal V after input matching and adjustment_1IP、V_1INThen the voltage signal V is output after being amplified by the pre-driving circuit₊、V_－To the output stage circuit, finally generating a modulated output current signal I_OP、I_ONThe negative capacitance circuit generates a negative capacitance to reduce an input capacitance of the output stage capacitance;

wherein the active reverse termination circuit comprises: a pair of transistors M_7A、M_7BA pair of transistors M_6A、M_6BA pair of transistors M_5A、M_5BA pair of transistors M_S1、M_S2A pair of resistors R_3A、R_3BA pair of capacitors C₁、C₂；

Transistor M_5A、M_6A、M_7AThe grid electrodes of the grid electrodes all receive a voltage signal V₊Transistor M_5B、M_6B、M_7BThe grid electrodes of the grid electrodes all receive a voltage signal V_－(ii) a Transistor M_5A、M_6A、M_7AAre commonly connected to M_S2A gate electrode of (1); transistor M_5B、M_6B、M_7BAre commonly connected to M_S1A gate electrode of (1); transistor M_5A、M_5BAre all connected to a tail current source I_M1K is; transistor M_6A、M_6BAre all connected to a tail current source I_M2K is; transistor M_7A、M_7BAre all connected to a tail current source I_M3/k；

Resistance R_3A、R_3BOne end of which is connected with a voltage source V_DDResistance R_3AIs connected with the other end of the transistor M_S2Gate of (3), resistance R_3BIs connected with the other end of the transistor M_S1A gate electrode of (1); transistor M_S1、M_S2Are all connected to a voltage source V_DD(ii) a Transistor M_S1Is connected to a tail current source I_B1Transistor M_S2Is connected to a tail current source I_B2(ii) a Capacitor C₁One end of which is connected with the transistor M_S2And the other end as a current signal I_OPOutput terminal of (1), capacitor C₂One end of which is connected with the transistor M_S1And the other end as a current signal I_ONTo the output terminal of (a).

As a further improvement of the above aspect, the input stage circuit includes: transistor M_DResistance R_INA、R_INB、R_1A、R_1BA pair of transistors M_1A、M_1B；

Wherein the transistor M_1A、M_1BRespectively receiving voltage signals V_IP、V_INTransistor M_1A、M_1BRespectively outputs a voltage signal V_1IN、V_1IPTransistor M_1A、M_1BAre all connected to a tail current source I₁；

Resistance R_INAOne end of which is connected with a voltage source V_cmResistance R_INAIs connected with the other end of the transistor M_1AA gate electrode of (1);

resistance R_INBOne end of which is connected with a voltage source V_cmResistance R_INBIs connected with the other end of the transistor M_1BA gate electrode of (1);

resistance R_1AOne end of which is connected with the transistor M_1ADrain electrode of (3), resistance R_1AIs connected with the other end of the transistor M_DSource of (1), transistor M_DBoth the grid electrode and the drain electrode of the grid electrode are connected with a voltage source V_DD；

Resistance R_1BOne end of which is connected with the transistor M_1BDrain electrode of (3), resistance R_1BIs connected with the other end of the transistor M_DOf the substrate.

Further, a resistor R_INA、R_INBAll resistance values of (2) are 50 ohms.

As a further improvement of the above aspect, the pre-drive circuit includes: a pair of transistors M_2A、M_2BA pair of resistors R_2A、R_2B；

Wherein the transistor M_2A、M_2BRespectively receiving voltage signals V_1IP、V_1INTransistor M_2A、M_2BRespectively outputs a voltage signal V_－、V₊Transistor M_2A、M_2BAre all connected toTo a tail current source I₂。

As a further improvement of the above aspect, the negative capacitance circuit includes: a pair of transistors M_3A、M_3BCapacitor C_c；

Wherein the transistor M_3A、M_3BRespectively receiving voltage signals V₊、V_－Transistor M_3A、M_3BRespectively outputs a voltage signal V_－、V₊Transistor M_3A、M_3BAre respectively connected to a tail current source I_3A、I_3B。

As a further improvement of the above aspect, the output stage circuit includes: a pair of transistors M_4A、M_4BA pair of transistors M_CA、M_CB；

Wherein the transistor M_4A、M_CAThe grid electrodes of the grid electrodes all receive a voltage signal V₊Transistor M_4B、M_CBThe grid electrodes of the grid electrodes all receive a voltage signal V_－(ii) a Transistor M_4A、M_4BAre all connected to a tail current source I_M1(ii) a Transistor M_4A、M_4BAre respectively connected to the current signal I_OPAnd the current signal I_ONAn output terminal of (a); transistor M_CABoth the source and the drain of (2) are connected to a current signal I_ONOf the output terminal of transistor M_CBBoth the source and the drain of (2) are connected to a current signal I_OPTo the output terminal of (a).

As a further improvement of the above aspect, when the laser driving circuit includes a plurality of output stage circuits connected in parallel, each output stage circuit of the subsequent stage is connected to the output stage circuit of the preceding stage through one switching circuit, and at least one output stage circuit among the plurality of output stage circuits connected in parallel is selected by turning on and off the corresponding switching circuit.

Further, the switching circuit includes a transistor M_S1、M_S2Transistor M_S1、M_S2The grid electrode receives a switch control signal V_sTransistor M_S1、M_S2Are respectively connected with two input ends of corresponding output stage circuit, transistor M_S1、M_S2Respectively receive voltage signals V₊、V_－。

The invention also provides a high-speed large-current laser driving chip which is formed by packaging any high-speed large-current laser driving circuit.

As a further improvement of the above solution, the pin of the chip includes:

a pair of input pins for inputting a voltage signal V_IP、V_INIntroducing to the input stage circuit;

a pair of output pins for receiving the current signal I_OPOutput terminal of (1), current signal I_ONOutput ends of the two output terminals respectively lead out an output current signal I_OP、I_ON；

The tail current source pins are used for being connected with tail current sources required by the high-speed large-current laser driving circuit;

the voltage source pins are used for accessing a voltage source required by the high-speed high-current laser driving circuit;

wherein, when the laser driving circuit comprises a plurality of output stage circuits connected in parallel, the pins of the chip further comprise:

at least one control signal pin for receiving at least one control signal for selecting at least one output stage circuit among a plurality of output stage circuits connected in parallel.

The high-speed large-current laser driving circuit avoids the use of a termination resistor at an output stage to absorb reflected waves, so that the power consumption of the circuit is remarkably increased, and the power consumption of the circuit is greatly reduced compared with that of a traditional circuit while the output matching of the circuit can be well realized.

Drawings

Fig. 1 is a schematic diagram of functional modules of a high-speed large-current laser driving circuit according to an embodiment of the present invention.

Fig. 2 is a circuit diagram of fig. 1 without the output stage circuit II, the output stage circuit III, and the active reverse termination circuit.

Fig. 3 is a schematic diagram of the active reverse termination circuit of fig. 1 after completion.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

The high-speed large-current laser driving circuit comprises an input stage circuit, a pre-driving circuit, a negative capacitor circuit, an active reverse termination circuit, an output stage circuit or a plurality of output stage circuits connected in parallel. Voltage signal V_IP、V_INIs input by the input stage circuit, and outputs a voltage signal V after input matching and adjustment_1IP、V_1INThen the voltage signal V is output after being amplified by the pre-driving circuit₊、V_－To the output stage circuit, finally generating a modulated output current signal I_OP、I_ONThe negative capacitance circuit generates a negative capacitance to reduce an input capacitance of the output stage capacitance.

The high-speed high-current laser driving circuit includes one output stage circuit, and the high-speed high-current laser driving circuit includes a plurality of output stage circuits connected in parallel.