Configurable adaptive biasing circuit

Abstract

The invention relates to a configurable adaptive bias circuit, comprising: a dynamic bias part for generating a dynamic bias current according to a radio frequency signal and a dynamic bias control signal; the static bias part is used for generating static bias current according to the static bias control signal; and the addition circuit part is used for adding the dynamic bias current and the static bias current to serve as a bias signal of the radio frequency amplification circuit. According to the invention, the self-adaptive dynamic adjustment range and the detection sensitivity can be configured while the requirements of high linearity and high efficiency of the amplifier are met.

Description

Technical Field

[0001] The invention relates to the technical field of radio frequency signal amplification control, and in particular to a configurable adaptive bias circuit. Background Art

[0002] For an amplifier, especially a power amplifier, a simple fixed voltage or fixed current bias can no longer meet the actual application requirements. In order to improve the linearity of the amplifier or to perform temperature compensation, the amplifier usually adopts a dynamic bias circuit.

[0003] The existing patent document CN118100819A discloses a power amplifier based on an adaptive high-linearity active bias network, which uses an adaptive high-linearity active bias network improved from a traditional Double Diode, greatly improving the linearity of the power amplifier, so that the power amplifier can meet the linearity of WIFI modulation signals under different trials. Although the bias circuit can automatically adjust the bias current or voltage according to the output power of the amplifier, the adjustment range and the power detection sensitivity are not adjustable. Once the chip design is fixed, these indicators will be fixed after the chip is manufactured. If the dynamic adjustment range, degree and other indicators are not suitable, the chip needs to be redesigned and re-made. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a configurable adaptive bias circuit, which can configure the adaptive dynamic adjustment range and detection sensitivity while meeting the requirements of high linearity and high efficiency of the amplifier.

[0005] The technical solution adopted by the present invention to solve the technical problem is: to provide a configurable adaptive bias circuit, comprising:

[0006] A dynamic bias part, used for generating a dynamic bias current according to a radio frequency signal and a dynamic bias control signal;

[0007] A static bias part, used for generating a static bias current according to a static bias control signal;

[0008] The adding circuit part is used to add the dynamic bias current and the static bias current as a bias signal of the radio frequency amplification circuit.

[0009] The dynamic bias part includes a power detection circuit, a controllable voltage source, a first transistor, a fifth transistor and an eighth transistor. The power detection circuit is used to convert the radio frequency signal into a DC voltage signal; the controllable voltage source is used to generate a dynamic bias control signal according to the dynamic bias control signal; the gate of the first transistor is connected to the output end of the power detection circuit and the controllable voltage source, the drain is connected to the drain of the fifth transistor, and the source is grounded; the gate of the fifth transistor is connected to the drain of the fifth transistor, and the source is connected to the power supply end; the gate of the eighth transistor is connected to the gate of the fifth transistor, the drain is connected to the input end of the adding circuit part, and the source is connected to the power supply end.

[0010] The power detection circuit includes a ninth transistor, a tenth transistor and an eleventh transistor, the radio frequency signal is input to the gate of the ninth transistor; the source of the ninth transistor is grounded, and the drain is connected to the power supply end through an RC circuit; the gate of the tenth transistor is connected to the drain of the ninth transistor, the source is connected to the power supply end, and the drain is connected to the drain of the eleventh transistor, serving as the output end of the power detection circuit; the gate of the eleventh transistor is connected to the drain of the ninth transistor, and the source is grounded.

[0011] The static bias part includes a controllable current source, a second transistor, a third transistor, a sixth transistor and a seventh transistor. The controllable current source is used to generate a static bias control signal according to a static bias control signal. The gate of the second transistor is connected to the gate of the third transistor, the drain is connected to the output end of the controllable current source, and the source is grounded; the gate of the second transistor is also connected to the drain of the second transistor; the source of the third transistor is grounded, and the drain is connected to the drain of the sixth transistor; the gate of the sixth transistor is connected to the gate of the seventh transistor, and the source is connected to the power supply end; the gate of the seventh transistor is connected to the drain of the sixth transistor, the source is connected to the power supply end, and the drain is connected to the input end of the adding circuit part.

[0012] The adding circuit part includes a fourth transistor, the gate of the fourth transistor is connected to the drain of the fourth transistor, and the source is grounded; the drain of the fourth transistor is respectively connected to the output ends of the dynamic bias part and the static bias part.

[0013] Beneficial Effects

[0014] Due to the adoption of the above technical scheme, the present invention has the following advantages and positive effects compared with the prior art: the slope and starting point of the dynamic bias of the present invention can be adjusted by control, the static bias can also be adjusted by control, and finally the superposition of the static bias and the static bias is used as the amplifier bias input. By adjusting the dynamic bias and the static bias, adaptive dynamic adjustment range and detection sensitivity can be achieved, and at the same time, the requirements of high linearity and high efficiency of the amplifier can be met. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a block diagram of a configurable adaptive bias circuit according to an embodiment of the present invention;

[0016] Figure 2 is a circuit diagram of a configurable adaptive bias circuit according to an embodiment of the present invention;

[0017] Figure 3 is a circuit diagram of a power detection circuit in an embodiment of the present invention;

[0018] Figure 4 It is a rendering of a configurable adaptive bias circuit according to an embodiment of the present invention. DETAILED DESCRIPTION

[0019] The present invention will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms fall within the scope limited by the appended claims of the application equally.

[0020] Embodiments of the present invention relate to a configurable adaptive bias circuit, such as Figure 1 As shown, it includes: a dynamic bias part, which is used to generate a dynamic bias current according to a radio frequency signal and a dynamic bias control signal; a static bias part, which is used to generate a static bias current according to the static bias control signal; and an adding circuit part, which is used to add the dynamic bias current and the static bias current as a bias signal of the radio frequency amplifier circuit.

[0021] Among them, the dynamic bias part includes a power sensing input port, a dynamic bias control port and a dynamic bias output port. Among them, the power sensing input port is used to input the RF signal, so that the current power size of the RF amplifier can be sensed; the dynamic bias control port is used to control the enablement and sensing sensitivity of the dynamic bias circuit; the dynamic bias output port is used to output the dynamic bias current.

[0022] like Figure 2As shown, the dynamic bias part includes a power detection circuit (RF to DC), a controllable voltage source, a first transistor M0, a fifth transistor M4 and an eighth transistor M7, wherein the power detection circuit is used to convert the RF signal into a DC voltage signal; the controllable voltage source is used to generate a dynamic bias control signal according to a dynamic bias control signal; the gate of the first transistor M0 is connected to the output end of the power detection circuit and the controllable voltage source, the drain is connected to the drain of the fifth transistor M4, and the source is grounded; the gate of the fifth transistor M4 is connected to the drain of the fifth transistor M4, and the source is connected to the power supply end; the gate of the eighth transistor M7 is connected to the gate of the fifth transistor M4, the drain is connected to the input end of the adding circuit part, and the source is connected to the power supply end.

[0023] like Figure 3 As shown, the power detection circuit of this embodiment includes a ninth transistor M8, a tenth transistor M9 and an eleventh transistor M10, the RF signal is input to the gate of the ninth transistor M8; the source of the ninth transistor M8 is grounded, and the drain is connected to the power supply terminal through an RC circuit; the gate of the tenth transistor M9 is connected to the drain of the ninth transistor M8, the source is connected to the power supply terminal, and the drain is connected to the drain of the eleventh transistor M10, serving as the output terminal of the power detection circuit; the gate of the eleventh transistor M10 is connected to the drain of the ninth transistor M8, and the source is grounded. In this circuit, the RF signal is converted into a DC signal after passing through the rectifier amplifier circuit composed of the ninth transistor M8 and the RC circuit, and then output through the inverter buffer composed of the tenth transistor M9 and the eleventh transistor M10.

[0024] In this embodiment, the RF signal is converted into a DC voltage signal through a power detection circuit, and the converted DC voltage signal controls the gate of the first transistor M0 together with the output voltage of the controllable voltage source, thereby adjusting the current of the first transistor M0. The dynamic bias control signal can adjust the size of the output signal of the controllable voltage source, and the threshold voltage of the dynamic bias can be adjusted by adjusting the output of the controllable voltage source, thereby achieving a configurable effect. The current I0 of the first transistor M0 is equal to the current I4 of the fifth transistor M4, and the eighth transistor M7 and the fifth transistor M4 form a current mirror, so the current I7 flowing through the eighth transistor M7 = x*I4 = x*I0, where x is the size ratio of the eighth transistor M7 to the fifth transistor M4.

[0025] The static bias circuit includes a static bias control port, which can still provide bias when the dynamic bias is not enabled, and the magnitude of the bias can be adjusted through the static bias control port.

[0026] The static bias part in this embodiment includes a controllable current source, a second transistor M1, a third transistor M2, a sixth transistor M5 and a seventh transistor M6. The controllable current source is used to generate a static bias control signal according to a static bias control signal. The gate of the second transistor M1 is connected to the gate of the third transistor M2, the drain is connected to the output end of the controllable current source, and the source is grounded; the gate of the second transistor M1 is also connected to the drain of the second transistor M1; the source of the third transistor M2 is grounded, and the drain is connected to the drain of the sixth transistor M5; the gate of the sixth transistor M5 is connected to the gate of the seventh transistor M6, and the source is connected to the power supply end; the gate of the seventh transistor M6 is connected to the drain of the sixth transistor M5, the source is connected to the power supply end, and the drain is connected to the input end of the adding circuit part.

[0027] In the static bias part, the current I1 of the second transistor M1 is controlled by the static bias control signal. The second transistor M1 and the third transistor M2 form a current mirror, and the sixth transistor M5 and the seventh transistor M6 form a current mirror. Therefore, the current I6 flowing through the seventh transistor M6 = y*I1.

[0028] The adding circuit in this embodiment includes a fourth transistor M3, the gate of the fourth transistor M3 is connected to the drain of the fourth transistor M3, and the source is grounded; the drain of the fourth transistor M3 is connected to the output ends of the dynamic bias part and the static bias part respectively. Therefore, the current I3 flowing through the fourth transistor M3 = x*I0+y*I1. The fourth transistor M3 can be used as a mirror tube of the transistor MRF in the radio frequency amplifier circuit, so the bias of the transistor MRF is controlled by both the static bias and the dynamic bias, and can be freely configured.

[0029] The final effect of this implementation is as follows Figure 4 As shown. The slope and starting point of the dynamic bias can be adjusted by control, and the static bias can also be adjusted by control. Finally, the superposition of the static bias and the static bias is used as the amplifier bias input. By adjusting the dynamic bias and the static bias, the adaptive dynamic adjustment range and detection sensitivity can be achieved, and the requirements of high linearity and high efficiency of the amplifier can be met at the same time.

Claims

1. A configurable adaptive bias circuit, characterized in that: include: A dynamic bias part, used for generating a dynamic bias current according to a radio frequency signal and a dynamic bias control signal; A static bias part, used for generating a static bias current according to a static bias control signal; The adding circuit part is used to add the dynamic bias current and the static bias current as a bias signal of the radio frequency amplification circuit.

2. The configurable adaptive bias circuit according to claim 1, characterized in that: The dynamic bias part includes a power detection circuit, a controllable voltage source, a first transistor, a fifth transistor and an eighth transistor. The power detection circuit is used to convert the radio frequency signal into a DC voltage signal; the controllable voltage source is used to generate a dynamic bias control signal according to the dynamic bias control signal; the gate of the first transistor is connected to the output end of the power detection circuit and the controllable voltage source, the drain is connected to the drain of the fifth transistor, and the source is grounded; the gate of the fifth transistor is connected to the drain of the fifth transistor, and the source is connected to the power supply end; the gate of the eighth transistor is connected to the gate of the fifth transistor, the drain is connected to the input end of the adding circuit part, and the source is connected to the power supply end.

3. The configurable adaptive bias circuit according to claim 2, characterized in that: The power detection circuit includes a ninth transistor, a tenth transistor and an eleventh transistor, the radio frequency signal is input to the gate of the ninth transistor; the source of the ninth transistor is grounded, and the drain is connected to the power supply end through an RC circuit; the gate of the tenth transistor is connected to the drain of the ninth transistor, the source is connected to the power supply end, and the drain is connected to the drain of the eleventh transistor, serving as the output end of the power detection circuit; the gate of the eleventh transistor is connected to the drain of the ninth transistor, and the source is grounded.

4. The configurable adaptive bias circuit according to claim 1, characterized in that: The static bias part includes a controllable current source, a second transistor, a third transistor, a sixth transistor and a seventh transistor. The controllable current source is used to generate a static bias control signal according to a static bias control signal. The gate of the second transistor is connected to the gate of the third transistor, the drain is connected to the output end of the controllable current source, and the source is grounded; the gate of the second transistor is also connected to the drain of the second transistor; the source of the third transistor is grounded, and the drain is connected to the drain of the sixth transistor; the gate of the sixth transistor is connected to the gate of the seventh transistor, and the source is connected to the power supply end; the gate of the seventh transistor is connected to the drain of the sixth transistor, the source is connected to the power supply end, and the drain is connected to the input end of the adding circuit part.

5. The configurable adaptive bias circuit according to claim 1, wherein: The adding circuit part includes a fourth transistor, the gate of the fourth transistor is connected to the drain of the fourth transistor, and the source is grounded; the drain of the fourth transistor is respectively connected to the output ends of the dynamic bias part and the static bias part.

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