WO2019019359A1 - Bidirectional current self-adaptive power amplifier bias circuit - Google Patents
Bidirectional current self-adaptive power amplifier bias circuit Download PDFInfo
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Abstract
A bidirectional current self-adaptive power amplifier bias circuit, comprising: an operational amplifier, a forward regulation circuit, an inverted regulation circuit and a feedback circuit, wherein when the current of the bidirectional current self-adaptive power amplifier bias circuit is not inverted, the forward regulation circuit is conducted, and at this time, the current is absorbed by means of a negative power source connected to the forward regulation circuit and passes through the feedback circuit, so that the voltage at an output end (2) of the bidirectional current self-adaptive power amplifier bias circuit is kept stable; and when the current of the bidirectional current self-adaptive power amplifier bias circuit is inverted, the inverted regulation circuit is conducted, and at this time, the current is released by means of a ground end connected to the inverted regulation circuit and passes through the feedback circuit, so that the voltage at the output end (2) of the bidirectional current self-adaptive power amplifier bias circuit is kept stable. The present invention can maintain voltage stability where a gate current of a high-power amplifier tube is inverted, and is suitable for the problem of the gate current of the high-power amplifier tube being inverted.
Description
本发明涉及偏置电路技术领域，特别是涉及一种双向电流自适应功率放大器偏置电路。The present invention relates to the field of bias circuits, and in particular to a bidirectional current adaptive power amplifier bias circuit.
随着无线通信技术的迅速发展，放大器的使用变得非常普及，近年来，更是朝着高功率的方向发展。在实际运用中，随着高功率放大器的输入、输出功率的提高以及环境温度的变化，放大器的栅极电压、栅极电流存在波动，偶尔甚至还出现电流反向翻转的现象，这种情况，往往导致高功率放大器的损坏。然而，传统的偏置电路已经无法适用于高功率放大器栅极在维持电压稳定的前提下电流反向翻转的特性。With the rapid development of wireless communication technology, the use of amplifiers has become very popular, and in recent years, it has been moving toward high power. In practical applications, with the increase of the input and output power of the high-power amplifier and the change of the ambient temperature, the gate voltage and the gate current of the amplifier fluctuate, and occasionally the reverse current reverse phenomenon occurs. It often leads to damage to high power amplifiers. However, the conventional bias circuit has been unable to be applied to the characteristics of the reverse flipping of the current of the high power amplifier gate while maintaining voltage stability.
发明内容Summary of the invention
基于此，提供一种双向电流自适应功率放大器偏置电路，解决传统的偏置电路无法适用于高功率放大器栅极在维持电压稳定的前提下电流反向翻转的问题。Based on this, a bidirectional current adaptive power amplifier bias circuit is provided, which solves the problem that the conventional bias circuit cannot be applied to the reverse reverse current of the high power amplifier gate under the premise of maintaining voltage stability.
一种双向电流自适应功率放大器偏置电路，包括：运算放大器、正向调节电路、翻转调节电路以及反馈电路；A bidirectional current adaptive power amplifier bias circuit includes: an operational amplifier, a forward regulation circuit, a flip adjustment circuit, and a feedback circuit;
所述运算放大器的输出端分别连接所述正向调节电路的第一输入端、所述翻转调节电路的第一输入端；所述反馈电路的一端、所述正向调节电路的输出端、所述翻转调节电路的输出端均连接所述双向电流自适应功率放大器偏置电路的输出端，所述反馈电路的另一端连接运算放大器的反相输入端，所述正向调节电路的第二输入端连接负电源，所述翻转调节电路的第二输入端连接接地；所述运算放大器的反相输入端为所述双向电流自适应功率放大器偏置电路的电信号输入端；An output end of the operational amplifier is respectively connected to a first input end of the forward adjustment circuit, a first input end of the inversion adjustment circuit, an end of the feedback circuit, an output end of the forward adjustment circuit, and a An output end of the flip adjustment circuit is connected to an output end of the bidirectional current adaptive power amplifier bias circuit, and the other end of the feedback circuit is connected to an inverting input terminal of the operational amplifier, and the second input of the forward adjustment circuit The second input end of the inversion adjustment circuit is connected to the ground; the inverting input end of the operational amplifier is an electrical signal input end of the bidirectional current adaptive power amplifier bias circuit;
当所述双向电流自适应功率放大器偏置电路的电流未发生翻转时，所述
正向调节电路导通，此时通过正向调节电路连接的负电源吸收电流，并经过所述反馈电路，使所述双向电流自适应功率放大器偏置电路的输出端电压维持稳定；When the current of the bidirectional current adaptive power amplifier bias circuit is not flipped,
The forward regulation circuit is turned on, at this time, the negative power source connected by the forward regulation circuit absorbs the current, and the voltage of the output terminal of the bias circuit of the bidirectional current adaptive power amplifier is maintained stable through the feedback circuit;
当所述双向电流自适应功率放大器偏置电路的电流发生翻转时，所述翻转调节电路导通，此时通过翻转调节电路连接的地端释放电流，并经过所述反馈回路，使所述双向电流自适应功率放大器偏置电路的输出端电压维持稳定。When the current of the bidirectional current adaptive power amplifier bias circuit is reversed, the flip adjustment circuit is turned on, at which time the current is discharged by the ground connected by the flip adjustment circuit, and the two-way current is passed through the feedback loop to make the two-way The output voltage of the current adaptive power amplifier bias circuit remains stable.
上述双向电流自适应功率放大器偏置电路，通过设置正向调节电路和翻转调节电路，当双向电流自适应功率放大器偏置电路的输出端电流未发生偏转，正向电路导通，在偏置电路输出端的电压升高或降低时，此时通过连接的负电源吸收电流，并经过负反馈回路，使双向电流自适应功率放大器偏置电路的输出端电压维持稳定；当双向电流自适应功率放大器偏置电路的输出端电流发生偏转，翻转调节电路导通，在偏置电路输出端的电压升高或降低时，此时通过翻转调节电路连接的地端释放电流，并经过负反馈回路，使双向电流自适应功率放大器偏置电路的输出端电压维持稳定。通过上述技术方案，使偏置电路输出端电压维持稳定；将所述双向电流自适应功率放大器偏置电路的输出端连接高功率放大器栅极，可实现在高功率放大器栅极电压稳定的前提下适用于电流反向翻转的问题。The bidirectional current adaptive power amplifier bias circuit is provided with a forward adjustment circuit and a flip adjustment circuit, when the output current of the bidirectional current adaptive power amplifier bias circuit is not deflected, the forward circuit is turned on, and the bias circuit is When the voltage at the output rises or falls, the current is absorbed by the connected negative power supply and passes through the negative feedback loop, so that the output voltage of the bidirectional current adaptive power amplifier bias circuit remains stable; when the bidirectional current adaptive power amplifier is biased The current at the output of the circuit is deflected, and the flip-regulation circuit is turned on. When the voltage at the output of the bias circuit rises or falls, the current is connected to the ground connected by the flip-regulation circuit, and the negative feedback loop is used to make the bidirectional current. The output voltage of the adaptive power amplifier bias circuit remains stable. Through the above technical solution, the voltage of the output terminal of the bias circuit is maintained stable; connecting the output end of the bidirectional current adaptive power amplifier bias circuit to the gate of the high power amplifier can realize the condition that the gate voltage of the high power amplifier is stable. Suitable for problems with reverse current reversal.
图1为一实施例中双向电流自适应功率放大器偏置电路的示意性结构图；1 is a schematic structural diagram of a bidirectional current adaptive power amplifier bias circuit in an embodiment;
图2为另一实施例中双向电流自适应功率放大器偏置电路的示意性结构图。2 is a schematic structural diagram of a bidirectional current adaptive power amplifier bias circuit in another embodiment.
为更进一步阐述本发明所采取的技术手段及取得的效果，下面结合附图及较佳实施例，对本发明实施例的技术方案，进行清楚和完整的描述。The technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings and preferred embodiments.
图1为一实施例中双向电流自适应功率放大器偏置电路的示意性结构图，
如图1所示，所述双向电流自适应功率放大器偏置电路包括：运算放大器、正向调节电路、翻转调节电路以及反馈电路。1 is a schematic structural diagram of a bidirectional current adaptive power amplifier bias circuit in an embodiment,
As shown in FIG. 1, the bidirectional current adaptive power amplifier bias circuit includes an operational amplifier, a forward regulation circuit, a flip adjustment circuit, and a feedback circuit.
所述运算放大器的输出端分别连接所述正向调节电路的第一输入端、所述翻转调节电路的第一输入端；所述反馈电路的一端、所述正向调节电路的输出端、所述翻转调节电路的输出端均连接所述双向电流自适应功率放大器偏置电路的输出端2，所述反馈电路的另一端连接运算放大器的反相输入端，所述正向调节电路的第二输入端连接负电源，所述翻转调节电路的第二输入端连接地端；所述运算放大器的反相输入端为所述双向电流自适应功率放大器偏置电路的电信号输入端1。An output end of the operational amplifier is respectively connected to a first input end of the forward adjustment circuit, a first input end of the inversion adjustment circuit, an end of the feedback circuit, an output end of the forward adjustment circuit, and a The output of the flip regulation circuit is connected to the output terminal 2 of the bidirectional current adaptive power amplifier bias circuit, and the other end of the feedback circuit is connected to the inverting input terminal of the operational amplifier, and the second of the forward regulation circuit The input terminal is connected to the negative power supply, and the second input end of the flip adjustment circuit is connected to the ground end; the inverting input end of the operational amplifier is the electrical signal input end 1 of the bidirectional current adaptive power amplifier bias circuit.
当双向电流自适应功率放大器偏置电路的电信号输入端1有电压输入时，双向电流自适应功率放大器偏置电路的输出端2输出一个负电压，由于外接高功率放大器输出功率或者环境温度变化，输出端2的电压和电流可能发生变化，通过上述连接，实现双向电流自适应功率放大器偏置电路输出端电压稳定的过程具体可以是：当所述双向电流自适应功率放大器偏置电路的电流未发生翻转时，所述正向调节电路导通，此时通过正向调节电路连接的负电源吸收电流，并经过所述反馈电路，使所述双向电流自适应功率放大器偏置电路的输出端电压维持稳定；当所述双向电流自适应功率放大器偏置电路的电流发生翻转时，所述翻转调节电路导通，此时通过翻转调节电路连接的地端释放电流，并经过所述反馈回路，使所述双向电流自适应功率放大器偏置电路的输出端电压维持稳定。When the electrical signal input terminal 1 of the bidirectional current adaptive power amplifier bias circuit has a voltage input, the output terminal 2 of the bidirectional current adaptive power amplifier bias circuit outputs a negative voltage due to the external high power amplifier output power or ambient temperature change. The voltage and current of the output terminal 2 may change. Through the above connection, the process of realizing the voltage stabilization of the output terminal of the bidirectional current adaptive power amplifier bias circuit may specifically be: when the bidirectional current adaptive power amplifier bias circuit current When the inversion does not occur, the forward adjustment circuit is turned on, at which time the negative power supply connected by the forward regulation circuit sinks current, and passes through the feedback circuit to make the output of the bidirectional current adaptive power amplifier bias circuit The voltage is maintained stable; when the current of the bidirectional current adaptive power amplifier bias circuit is reversed, the flip adjustment circuit is turned on, and at this time, the current is discharged through the ground connected by the flip adjustment circuit, and passes through the feedback loop. Outputting the bidirectional current adaptive power amplifier bias circuit Pressure remained stable.
本实施例的双向电流自适应功率放大器偏置电路通过设置正向调节电路和翻转调节电路，当双向电流自适应功率放大器偏置电路的输出端电流未发生偏转，正向调节电路导通，在偏置电路输出端的电压升高或降低时，此时通过正向调节电路连接的负电源吸收电流，经过负反馈回路，使双向电流自适应功率放大器偏置电路的输出端电压维持稳定；当双向电流自适应功率放大器偏置电路的输出端电流发生偏转，翻转调节电路导通，在偏置电路输出端的电压升高或降低时，此时通过翻转调节电路连接的地端释放电流，经过负反馈回路，使双向电流自适应功率放大器偏置电路的输出端电压维持稳定。
通过上述技术方案，使偏置电路输出端电压维持稳定；将所述双向电流自适应功率放大器偏置电路的输出端连接高功率放大器栅极，可实现在高功率放大器栅极电压稳定的前提下适用于电流反向翻转的问题。The bidirectional current adaptive power amplifier bias circuit of the embodiment provides a forward adjustment circuit and a flip adjustment circuit. When the output current of the bidirectional current adaptive power amplifier bias circuit is not deflected, the forward regulation circuit is turned on. When the voltage at the output of the bias circuit rises or falls, the negative power supply connected through the forward regulation circuit absorbs the current, and the voltage at the output of the bidirectional current adaptive power amplifier bias circuit is maintained through the negative feedback loop; The current of the current adaptive power amplifier bias circuit is deflected at the output end, and the flip adjustment circuit is turned on. When the voltage at the output of the bias circuit rises or falls, the ground current is discharged through the flip adjustment circuit, and the negative feedback is passed. The loop maintains the output voltage of the bidirectional current adaptive power amplifier bias circuit stable.
Through the above technical solution, the voltage of the output terminal of the bias circuit is maintained stable; connecting the output end of the bidirectional current adaptive power amplifier bias circuit to the gate of the high power amplifier can realize the condition that the gate voltage of the high power amplifier is stable. Suitable for problems with reverse current reversal.
具体的，在输出端2的电流未发生偏转时，正向调节电路导通，此时，当输出端2的电压升高时，运算放大器的输入端1的电压升高，运算放大器的输出端电压降低，导致正向调节电路的压降变小，使输出端2的电压降低。同理，当输出端2的电压降低时，运算放大器的输入端1的电压降低，运算放大器的输出端电压升高，导致正向调节电路的压降增大，从而使输出端2的电压升高，从而实现电压稳定。Specifically, when the current at the output terminal 2 is not deflected, the forward regulation circuit is turned on. At this time, when the voltage of the output terminal 2 rises, the voltage of the input terminal 1 of the operational amplifier rises, and the output terminal of the operational amplifier. The voltage drop causes the voltage drop of the forward regulation circuit to become smaller, causing the voltage at the output terminal 2 to decrease. Similarly, when the voltage at the output terminal 2 decreases, the voltage at the input terminal 1 of the operational amplifier decreases, and the voltage at the output terminal of the operational amplifier rises, causing the voltage drop of the forward regulation circuit to increase, thereby causing the voltage at the output terminal 2 to rise. High to achieve voltage stability.
在输出端电流发生偏转时，翻转调节电路导通，此时，当输出端2的电压升高时，运算放大器的输入端1的电压升高，运算放大器的输出端电压降低，导致翻转调节电路的压降变大，使输出端2的电压降低。同理，当输出端2的电压降低时，运算放大器的输入端1的电压降低，运算放大器的输出端电压升高，导致翻转调节电路的压降降低，从而使输出端2的电压升高。When the output current is deflected, the flip adjustment circuit is turned on. At this time, when the voltage of the output terminal 2 rises, the voltage of the input terminal 1 of the operational amplifier rises, and the voltage of the output terminal of the operational amplifier decreases, resulting in the flip adjustment circuit. The voltage drop becomes large, causing the voltage at the output terminal 2 to decrease. Similarly, when the voltage at the output terminal 2 decreases, the voltage at the input terminal 1 of the operational amplifier decreases, and the voltage at the output terminal of the operational amplifier rises, causing the voltage drop of the flip-regulation circuit to decrease, thereby causing the voltage at the output terminal 2 to rise.
图2为另一实施例中双向电流自适应功率放大器偏置电路的示意性结构图，如图2所示，所述运算放大器为双电源运算放大器，所述双电源运算放大器的供电正端连接所述正电源，所述双电源运算放大器的供电负端连接所述负电源。运算放大器工作需由直流电源供电，本实施例选用双电源供电的运算放大器，其供电负电源正好可以作为输出端2电流的吸收，进一步使电路简化，优化了双向电流自适应功率放大器偏置电路的电源使用个数。2 is a schematic structural diagram of a bidirectional current adaptive power amplifier bias circuit in another embodiment. As shown in FIG. 2, the operational amplifier is a dual power operational amplifier, and the power supply positive terminal of the dual power operational amplifier is connected. The positive power supply, the negative power supply terminal of the dual power operational amplifier is connected to the negative power supply. The operation of the operational amplifier needs to be powered by the DC power supply. In this embodiment, the operational amplifier with dual power supply is selected, and the negative power supply can be used as the absorption of the current of the output terminal 2, further simplifying the circuit, and optimizing the bias circuit of the bidirectional current adaptive power amplifier. The number of power supplies used.
在一实施例中，在电信号输入双向电流自适应功率放大器偏置电路前，还要通过第一电阻R1，第一电阻R1的另一端连接运算放大器的反向输入端。优选的，运算放大器的同相输入端也连接第二电阻R2，第二电阻R2的另一端接地。可选的，运算放大器的同相输入端为反向输入端的参考端，也可以接入一固定参考电压，具体根据电路的需求而设计。In one embodiment, before the electrical signal is input to the bidirectional current adaptive power amplifier bias circuit, the other end of the first resistor R1 is connected to the inverting input terminal of the operational amplifier through the first resistor R1. Preferably, the non-inverting input of the operational amplifier is also connected to the second resistor R2, and the other end of the second resistor R2 is grounded. Optionally, the non-inverting input of the operational amplifier is a reference end of the inverting input terminal, and a fixed reference voltage can also be connected, which is specifically designed according to the requirements of the circuit.
优选的，第一电阻R1的电阻值与第二电阻R2的电阻值相等，实现输入端的阻值匹配。Preferably, the resistance value of the first resistor R1 is equal to the resistance value of the second resistor R2, and the resistance matching at the input end is achieved.
在一实施例中，正向调节电路包括第三电阻R3、第四电阻R4以及场效
应晶体管Q1，其中，所述第三电阻R3的一端为所述正向调节电路的第一输入端，所述第三电阻R3的另一端连接所述第一场效应晶体管Q1的栅极，所述第一场效应晶体管Q1的源极为所述正向调节电路的输出端，所述第一场效应晶体管Q1的漏极连接第四电阻R4的一端，所述第四电阻R4的另一端为所述正向调节电路的第二输入端。In an embodiment, the forward regulation circuit includes a third resistor R3, a fourth resistor R4, and a field effect
a transistor Q1, wherein one end of the third resistor R3 is a first input end of the forward regulation circuit, and the other end of the third resistor R3 is connected to a gate of the first field effect transistor Q1. The source of the first field effect transistor Q1 is the output terminal of the forward regulation circuit, the drain of the first field effect transistor Q1 is connected to one end of the fourth resistor R4, and the other end of the fourth resistor R4 is The second input of the forward regulation circuit.
本实施例的正向调节电路，适用于在双向电流自适应功率放大器偏置电路输出端电流未发生偏转的条件下，第一场效应晶体管Q1导通，双向电流自适应功率放大器偏置电路的输出端的电流通过第四电阻R4流入负电源-VCC。当双向电流自适应功率放大器偏置电路的输出端电压升高时，运算放大器的输入端1的电压升高，运算放大器的输出端电压降低，从而使第一场效应管Q1的导通程度变大，第四电阻R4的压降升高，使双向电流自适应功率放大器偏置电路的输出端电压降低；基于相同的原理，当双向电流自适应功率放大器偏置电路的输出端电压降低时，第四电阻R4的压降降低，使双向电流自适应功率放大器偏置电路的输出端电压升高。通过上述的反馈，使双向电流自适应功率放大器偏置电路的输出端电压最终维持稳定。而设置第三电阻R3的目的是为了保护第一场效应晶体管Q1的栅极，实现限流的作用。The forward adjustment circuit of the embodiment is suitable for the first field effect transistor Q1 to be turned on under the condition that the current of the bidirectional current adaptive power amplifier bias circuit output is not deflected, and the bidirectional current adaptive power amplifier bias circuit The current at the output flows into the negative supply -VCC through the fourth resistor R4. When the voltage of the output terminal of the bidirectional current adaptive power amplifier bias circuit rises, the voltage of the input terminal 1 of the operational amplifier rises, and the voltage of the output terminal of the operational amplifier decreases, thereby changing the conduction degree of the first field effect transistor Q1. The voltage drop of the large, fourth resistor R4 is increased, so that the output voltage of the bidirectional current adaptive power amplifier bias circuit is lowered; based on the same principle, when the output voltage of the bidirectional current adaptive power amplifier bias circuit is lowered, The voltage drop across the fourth resistor R4 is reduced, causing the output voltage of the bidirectional current adaptive power amplifier bias circuit to rise. Through the above feedback, the output voltage of the bidirectional current adaptive power amplifier bias circuit is finally stabilized. The purpose of setting the third resistor R3 is to protect the gate of the first field effect transistor Q1 to achieve current limiting.
在一实施例中，翻转调节电路包括第五电阻R5、第六电阻R6以及第二场效应晶体管，其中，所述第五电阻R5的一端为所述翻转调节电路的第一输入端，所述第五电阻R5的另一端连接所述第二场效应晶体管Q2的栅极，所述第二场效应晶体管Q2的源极为翻转调节电路的输出端，所述第二场效应晶体管Q2的漏极连接第六电阻R6的一端，所述第六电阻R6的另一端为所述翻转调节电路的第二输入端。In one embodiment, the flip adjustment circuit includes a fifth resistor R5, a sixth resistor R6, and a second field effect transistor, wherein one end of the fifth resistor R5 is a first input end of the flip adjustment circuit, The other end of the fifth resistor R5 is connected to the gate of the second field effect transistor Q2, the source of the second field effect transistor Q2 is extremely inverted, and the drain of the second field effect transistor Q2 is connected. One end of the sixth resistor R6, and the other end of the sixth resistor R6 is a second input end of the inversion adjusting circuit.
本实施例的翻转调节电路，适用于在双向电流自适应功率放大器偏置电路输出端电流发生偏转的条件下，第二场效应晶体管Q2导通，双向电流自适应功率放大器偏置电路的输出端的电流通过第六电阻R6流入地端，当双向电流自适应功率放大器偏置电路的输出端电压升高时，运算放大器的输入端1的电压升高，运算放大器的输出端电压降低，从而使第二场效应管Q2的导通程度变大，第六电阻R6的压降升高，使双向电流自适应功率放大器偏置电路
的输出端电压降低；基于相同的原理，当双向电流自适应功率放大器偏置电路的输出端电压降低时，第六电阻R6的压降降低，使双向电流自适应功率放大器偏置电路的输出端电压升高。通过上述的反馈，使双向电流自适应功率放大器偏置电路的输出端电压最终维持稳定。而设置第五电阻R5的目的是为了保护第二场效应晶体管Q2的栅极，实现限流的作用。The inversion adjustment circuit of the embodiment is adapted to be turned on by the second field effect transistor Q2 under the condition that the current is deflected at the output end of the bidirectional current adaptive power amplifier bias circuit, and the output end of the bidirectional current adaptive power amplifier bias circuit The current flows into the ground through the sixth resistor R6. When the voltage at the output of the bidirectional current adaptive power amplifier bias circuit rises, the voltage at the input terminal 1 of the operational amplifier rises, and the voltage at the output terminal of the operational amplifier decreases. The conduction degree of the second field effect transistor Q2 becomes larger, and the voltage drop of the sixth resistor R6 rises, so that the bidirectional current adaptive power amplifier bias circuit
The output voltage is reduced; based on the same principle, when the output voltage of the bidirectional current adaptive power amplifier bias circuit is lowered, the voltage drop of the sixth resistor R6 is lowered, so that the output of the bidirectional current adaptive power amplifier bias circuit The voltage rises. Through the above feedback, the output voltage of the bidirectional current adaptive power amplifier bias circuit is finally stabilized. The purpose of setting the fifth resistor R5 is to protect the gate of the second field effect transistor Q2 to achieve a current limiting function.
优选的，第一场效应管采用PMOSFET场效应管，第二场效应管采用NMOSFET场效应管。Preferably, the first field effect transistor uses a PMOSFET field effect transistor, and the second field effect transistor uses an NMOSFET field effect transistor.
值得说明的是，第一场效应晶体管Q1和第二场效应晶体管Q2也可以采用其他场效应晶体管，具体可根据双向电流自适应功率放大器偏置电路的设计，选取第一场效应晶体管Q1和第二场效应晶体管Q2。It should be noted that the first field effect transistor Q1 and the second field effect transistor Q2 may also adopt other field effect transistors, and the first field effect transistor Q1 and the first field effect transistor may be selected according to the design of the bidirectional current adaptive power amplifier bias circuit. Two field effect transistor Q2.
在一实施例中，反馈电路包括第七电阻R7，第七电阻R7的两端即为反馈电路的两端。In an embodiment, the feedback circuit includes a seventh resistor R7, and both ends of the seventh resistor R7 are both ends of the feedback circuit.
可选的，根据双向电流自适应功率放大器偏置电路的具体设计，选择反馈电路的反馈电阻，例如，根据计算值，市面上没有相应规格的电阻可供选用，则采用多个电阻通过串并联的方式，使其等效电阻为计算的阻值。Optionally, according to the specific design of the bidirectional current adaptive power amplifier bias circuit, the feedback resistor of the feedback circuit is selected. For example, according to the calculated value, a resistor having no corresponding specification is available on the market, and multiple resistors are used in series and parallel connection. The way to make its equivalent resistance is the calculated resistance.
在一实施例中，还设置了滤波模块，所述正电源还连接第一电容的一端，所述第一电容的另一端接地。所述负电源还连接所述第二电容器的第一端，所述第二电容器的第二端接地。In an embodiment, a filtering module is further disposed, the positive power source is further connected to one end of the first capacitor, and the other end of the first capacitor is grounded. The negative supply is also coupled to the first end of the second capacitor, and the second end of the second capacitor is coupled to ground.
本实施例的第一电容器C1和第二电容器C2起到对正电源+VCC和负电源-VCC滤波的作用，从而使双向电流自适应功率放大器偏置电路的输出端输出的电压更加稳定。The first capacitor C1 and the second capacitor C2 of the present embodiment function to filter the positive power supply +VCC and the negative power supply -VCC, thereby making the voltage outputted from the output terminal of the bidirectional current adaptive power amplifier bias circuit more stable.
以下结合图2中一个具体的双向电流自适应功率放大器偏置电路对其工作原理进行说明，如图2所示，其中，第一电阻R1与第二电阻R2的阻值相同，第三电阻R3与第五电阻R5的阻值相同，第四电阻R4与第六电阻R6的阻值相同，将双向电流自适应功率放大器偏置电路的输出端2连接一高功率放大器的栅极。当双向电流自适应功率放大器偏置电路的输入端1有电压Vg_in输入时，输出端2有电压Vg输出，电压Vg与电压Vg_in的关系可以表示为
同时，高功率放大器开始工作，若此时高功率放大器的温度变化或其他原因，导致高功率放大器的栅极电压变化，即输出端2的电压变化，此时PMOSFET导通程度随之改变，通过第四电阻R4的压降变化，从而使输出端2的电压维持稳定。The working principle of the bidirectional current adaptive power amplifier bias circuit in FIG. 2 is described below, as shown in FIG. 2 , wherein the first resistor R1 and the second resistor R2 have the same resistance, and the third resistor R3 The resistance of the fifth resistor R5 is the same, the resistance of the fourth resistor R4 and the sixth resistor R6 are the same, and the output terminal 2 of the bidirectional current adaptive power amplifier bias circuit is connected to the gate of a high power amplifier. When the input of the bidirectional current adaptive power amplifier bias circuit voltage V g_in input 1, output terminal 2 an output voltage V g, and the voltage relationship between the voltage V g may be expressed as V g_in At the same time, the high power amplifier starts to work. If the temperature of the high power amplifier changes or other reasons, the gate voltage of the high power amplifier changes, that is, the voltage of the output terminal 2 changes. At this time, the PMOSFET conduction degree changes accordingly. The voltage drop of the fourth resistor R4 changes, so that the voltage at the output terminal 2 is maintained stable.
当高功率放大器的栅极电流发生翻转时，此时第二场效应管Q2导通，若高功率放大器的温度变化或其他原因，导致高功率放大器的栅极电压变化，即输出端2的电压变化，此时NMOSFET导通程度随之改变，通过第六电阻R6压降的变化，从而使输出端2的电压维持稳定。When the gate current of the high power amplifier is reversed, the second FET Q2 is turned on at this time. If the temperature of the high power amplifier changes or other reasons, the gate voltage of the high power amplifier changes, that is, the voltage of the output terminal 2 The change, at this time, the degree of conduction of the NMOSFET changes, and the voltage drop of the sixth resistor R6 changes, so that the voltage of the output terminal 2 is maintained stable.
综上所述，在输出端2的电压发生变化时，双向电流自适应功率放大器偏置电路做出相应的反应，使得输出端电压恢复原来的大小，并在双向电流自适应功率放大器偏置电路的输出端电流发生翻转时，依然能够稳定工作。In summary, when the voltage at the output terminal 2 changes, the bidirectional current adaptive power amplifier bias circuit reacts accordingly, so that the output terminal voltage returns to the original size, and the bidirectional current adaptive power amplifier bias circuit When the output current is turned over, it can still work stably.
以上所述实施例的各技术特征可以进行任意的组合，为使描述简洁，未对上述实施例中的各个技术特征所有可能的组合都进行描述，然而，只要这些技术特征的组合不存在矛盾，都应当认为是本说明书记载的范围。The technical features of the above-described embodiments may be arbitrarily combined. For the sake of brevity of description, all possible combinations of the technical features in the above embodiments are not described. However, as long as there is no contradiction between the combinations of these technical features, All should be considered as the scope of this manual.
以上所述实施例仅表达了本发明的几种实施方式，其描述较为具体和详细，但并不能因此而理解为对发明专利范围的限制。应当指出的是，对于本领域的普通技术人员来说，在不脱离本发明构思的前提下，还可以做出若干变形和改进，这些都属于本发明的保护范围。因此，本发明专利的保护范围应以所附权利要求为准。
The above-described embodiments are merely illustrative of several embodiments of the present invention, and the description thereof is more specific and detailed, but is not to be construed as limiting the scope of the invention. It should be noted that a number of variations and modifications may be made by those skilled in the art without departing from the spirit and scope of the invention. Therefore, the scope of the invention should be determined by the appended claims.
Claims (10)
- 一种双向电流自适应功率放大器偏置电路，其特征在于，包括：运算放大器、正向调节电路、翻转调节电路以及反馈电路；A bidirectional current adaptive power amplifier bias circuit, comprising: an operational amplifier, a forward regulation circuit, a flip adjustment circuit, and a feedback circuit;所述运算放大器的输出端分别连接所述正向调节电路的第一输入端、所述翻转调节电路的第一输入端；所述反馈电路的一端、所述正向调节电路的输出端、所述翻转调节电路的输出端均连接所述双向电流自适应功率放大器偏置电路的输出端，所述反馈电路的另一端连接运算放大器的反相输入端，所述正向调节电路的第二输入端连接负电源，所述翻转调节电路的第二输入端连接地端；所述运算放大器的反相输入端为所述双向电流自适应功率放大器偏置电路的电压信号输入端；An output end of the operational amplifier is respectively connected to a first input end of the forward adjustment circuit, a first input end of the inversion adjustment circuit, an end of the feedback circuit, an output end of the forward adjustment circuit, and a An output end of the flip adjustment circuit is connected to an output end of the bidirectional current adaptive power amplifier bias circuit, and the other end of the feedback circuit is connected to an inverting input terminal of the operational amplifier, and the second input of the forward adjustment circuit The second input end of the flip adjustment circuit is connected to the ground end; the inverting input end of the operational amplifier is a voltage signal input end of the bias circuit of the bidirectional current adaptive power amplifier;当所述双向电流自适应功率放大器偏置电路的电流未发生翻转时，所述正向调节电路导通，此时通过正向调节电路连接的负电源吸收电流，并经过所述反馈电路，使所述双向电流自适应功率放大器偏置电路的输出端电压维持稳定；When the current of the bidirectional current adaptive power amplifier bias circuit is not turned over, the forward regulation circuit is turned on, and the negative power source connected through the forward regulation circuit absorbs current and passes through the feedback circuit. The output voltage of the bidirectional current adaptive power amplifier bias circuit is maintained stable;当所述双向电流自适应功率放大器偏置电路的电流发生翻转时，所述翻转调节电路导通，此时通过翻转调节电路连接的地端释放电流，并经过所述反馈电路，使所述双向电流自适应功率放大器偏置电路的输出端电压维持稳定。When the current of the bidirectional current adaptive power amplifier bias circuit is reversed, the inversion adjustment circuit is turned on, at which time the current is discharged by the ground connected by the inverting adjustment circuit, and the two-way current is passed through the feedback circuit to make the two-way The output voltage of the current adaptive power amplifier bias circuit remains stable.
- 根据权利要求1所述的双向电流自适应功率放大器偏置电路，其特征在于，所述运算放大器为双电源运算放大器，所述双电源运算放大器的供电正端连接所述正电源，所述双电源运算放大器的供电负端连接所述负电源。The bidirectional current adaptive power amplifier bias circuit according to claim 1, wherein the operational amplifier is a dual power operational amplifier, and a positive power supply terminal of the dual power operational amplifier is connected to the positive power supply, the double The negative supply terminal of the power operational amplifier is connected to the negative power supply.
- 根据权利要求1所述的双向电流自适应功率放大器偏置电路，其特征在于，还包括：第一电阻和第二电阻；The bidirectional current adaptive power amplifier bias circuit according to claim 1, further comprising: a first resistor and a second resistor;所述运算放大器的反向输入端通过所述第一电阻连接所述电信号输入端；所述运算放大器的同向输入端通过所述第二电阻接地。An inverting input of the operational amplifier is coupled to the electrical signal input through the first resistor; a non-inverting input of the operational amplifier is coupled to ground through the second resistor.
- 根据权利要求1所述的双向电流自适应功率放大器偏置电路，其特征在于，所述正向调节电路包括第三电阻、第四电阻以及第一场效应晶体管；The bidirectional current adaptive power amplifier bias circuit according to claim 1, wherein the forward regulation circuit comprises a third resistor, a fourth resistor, and a first field effect transistor;所述第三电阻的一端为所述正向调节电路的第一输入端，所述第三电阻 的另一端连接所述第一场效应晶体管的栅极，所述第一场效应晶体管的源极为所述正向调节电路的输出端，所述第一场效应晶体管的漏极连接第四电阻的一端，所述第四电阻的另一端为所述正向调节电路的第二输入端。One end of the third resistor is a first input end of the forward regulation circuit, and the third resistor The other end of the first field effect transistor is connected to the gate of the first field effect transistor, the source of the first field effect transistor is the output terminal of the forward regulation circuit, and the drain of the first field effect transistor is connected to the fourth resistor At one end, the other end of the fourth resistor is a second input of the forward regulation circuit.
- 根据权利要求1所述的双向电流自适应功率放大器偏置电路，其特征在于，所述翻转调节电路包括第五电阻、第六电阻以及第二场效应晶体管；The bidirectional current adaptive power amplifier bias circuit according to claim 1, wherein the inversion adjustment circuit comprises a fifth resistor, a sixth resistor, and a second field effect transistor;所述第五电阻的一端为所述翻转调节电路的第一输入端，所述第五电阻的另一端连接所述第二场效应晶体管的栅极，所述第二场效应晶体管的源极为翻转调节电路的输出端，所述第二场效应晶体管的漏极连接第六电阻的一端，所述第六电阻的另一端为所述翻转调节电路的第二输入端。One end of the fifth resistor is a first input end of the inversion adjusting circuit, and the other end of the fifth resistor is connected to a gate of the second field effect transistor, and a source of the second field effect transistor is turned over And an output end of the adjustment circuit, a drain of the second field effect transistor is connected to one end of the sixth resistor, and the other end of the sixth resistor is a second input end of the inversion adjustment circuit.
- 根据权利要求1所述的双向电流自适应功率放大器偏置电路，其特征在于，所述反馈电路包括第七电阻；The bidirectional current adaptive power amplifier bias circuit according to claim 1, wherein said feedback circuit comprises a seventh resistor;所述第七电阻的两端为所述反馈电路的两端。Both ends of the seventh resistor are both ends of the feedback circuit.
- 根据权利要求4所述的双向电流自适应功率放大器偏置电路，其特征在于，所述第一场效应晶体管为PMOSFET。The bidirectional current adaptive power amplifier bias circuit of claim 4 wherein said first field effect transistor is a PMOSFET.
- 根据权利要求5所述的双向电流自适应功率放大器偏置电路，其特征在于，所述第二场效应晶体管为NMOSFET。The bidirectional current adaptive power amplifier bias circuit of claim 5 wherein said second field effect transistor is an NMOSFET.
- 根据权利要求2所述的姿势偏置电路，其特征在于，所述正电源还连接第一电容的一端，所述第一电容的另一端接地。The posture biasing circuit according to claim 2, wherein the positive power source is further connected to one end of the first capacitor, and the other end of the first capacitor is grounded.
- 根据权利要求1-9任一项所述的双向电流自适应功率放大器偏置电路，其特征在于，A bidirectional current adaptive power amplifier bias circuit according to any one of claims 1-9, characterized in that所述负电源还连接所述第二电容器的第一端，所述第二电容器的第二端接地。 The negative supply is also coupled to the first end of the second capacitor, and the second end of the second capacitor is coupled to ground.
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| US20040004507A1 (en) * | 2002-06-25 | 2004-01-08 | Matsushita Electric Industrial Co., Ltd. | Offset control circuit |
| CN1918784A (en) * | 2004-02-17 | 2007-02-21 | 艾利森电话股份有限公司 | Dynamically biased amplifier |
| CN101387894A (en) * | 2008-10-07 | 2009-03-18 | 深圳市矽普特科技有限公司 | Bias current generating circuit and operational amplifier |
| CN204836095U (en) * | 2015-07-22 | 2015-12-02 | 成都瑞联电气股份有限公司 | Expansive flows circuit is put to fortune that can export positive negative voltage |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110118887A (en) * | 2018-02-06 | 2019-08-13 | 株式会社东芝 | Current detection circuit |
| CN110118887B (en) * | 2018-02-06 | 2021-10-01 | 株式会社东芝 | Current detection circuit |
Also Published As
| Publication number | Publication date |
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| CN207283503U (en) | 2018-04-27 |
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