CN-122001312-A - Multistage automatic gain control loop, electronic equipment and control method

CN122001312ACN 122001312 ACN122001312 ACN 122001312ACN-122001312-A

Abstract

The application discloses a multistage automatic gain control loop, electronic equipment and a control method, which are applied to the field of communication. The input end of the N-stage variable gain amplifier is connected with the output end of the N-1-stage variable gain amplifier, the input end of the first-stage variable gain amplifier is connected with the mixer, the output end of the M-stage variable gain amplifier is connected with the input end of the analog-to-digital converter, N is an integer which is more than 1 and not more than M, the first pin end and the second pin end of each variable gain amplifier are connected with corresponding input ends in the signal distribution and swing adjustment module, the output end of the signal distribution and swing adjustment module is connected with the input end of the biasing module, the output end of the biasing module is connected with the input end of the signal intensity detection module, the output end of the signal intensity detection module is connected with the input end of the feedback processing module, and each output end of the feedback processing module is connected with the control end of each corresponding variable gain amplifier. It can be seen that the present application reduces the complexity of conventional automatic gain control loop designs.

Inventors

LI YONG
WANG RUNHUA

Assignees

上海集成电路研发中心有限公司

Dates

Publication Date: 20260508
Application Date: 20241105

Claims (10)

1. The multistage automatic gain control loop is characterized by comprising M variable gain amplifiers, a signal distribution and swing adjustment module, a bias module and a signal intensity detection module; The input end of the variable gain amplifier of the N-th stage is connected with the output end of the variable gain amplifier of the N-1 th stage, the input end of the variable gain amplifier of the first stage is connected with the mixer, the output end of the variable gain amplifier of the M-th stage is connected with the input end of the analog-to-digital converter, and N is an integer which is more than 1 and not more than M; the first pin end and the second pin end of each variable gain amplifier are connected with corresponding input ends in the signal distribution and swing adjustment module; The output end of the signal distribution and swing amplitude adjustment module is connected with the input end of the bias module; the output end of the bias module is connected with the input end of the signal intensity detection module; The output end of the signal intensity detection module is connected with the input end of the feedback processing module; And each output end of the feedback processing module is connected with the control end of each corresponding variable gain amplifier.
2. The multi-stage automatic gain control loop of claim 1, wherein the signal distribution and swing adjustment module comprises a plurality of switch control circuits, wherein the number of switch control circuits is the same as the number of variable gain amplifiers; The first input end and the second input end of each switch control circuit are used as input ends of the signal distribution and swing adjustment module and are respectively connected with the first pin end and the second pin end of the corresponding variable gain amplifier; each control end of each switch control circuit is connected with a corresponding control signal output end respectively; The third input end and the fourth input end of the N-1-th switch control circuit are connected with the first output end and the second output end of the N-1-th switch control circuit, and the first output end and the second output end of the M-th switch control circuit are used as the output ends of the signal distribution and swing adjustment module and are connected with the input end of the bias module.
3. The multi-stage automatic gain control loop of claim 2 wherein the switch control circuit comprises two structurally identical differential control circuits; The first end of the first differential control circuit is used as a first input end of the switch control circuit and is connected with a first pin end of the corresponding variable gain amplifier; the first end of the second differential control circuit is used as a second input end of the switch control circuit and is connected with a second pin end of the corresponding variable gain amplifier; The control ends of the first differential control circuit and the control ends of the second differential control circuit are used as the control ends of the switch control circuit and are respectively connected with the corresponding control signal output ends; the second end of the first differential control circuit is connected with the second end of the second differential control circuit; a third terminal of a first one of the differential control circuits is used as a first output terminal of the switch control circuit; a third end of the second differential control circuit is used as a second output end of the switch control circuit; When the differential control circuit is the N-th differential control circuit in the switch control circuit, the fourth end of the first differential control circuit is used as the third input end of the switch control circuit, and the fourth end of the second differential control circuit is used as the fourth input end of the switch control circuit.
4. The multi-stage automatic gain control loop of claim 3 wherein the differential control circuit comprises a first switch, a first resistor, and a second resistor; the first end of the first switch is used as the first end of the differential control circuit and is connected with the first pin end or the second pin end of the corresponding variable gain amplifier; The second end and the third end of the first switch are used as control ends of the differential control circuit and are respectively connected with the corresponding control signal output ends; the fourth end of the first switch is connected with the first end of the first resistor; the second end of the second resistor is connected with the first end of the second resistor and is used as a third end of the differential control circuit; when the differential control circuit is the nth differential control circuit in the switch control circuit, the fourth end of the first switch and the first end of the first resistor are used as the fourth end of the differential control circuit together.
5. The multi-stage automatic gain control loop of claim 1 wherein the bias module comprises two structurally identical differential bias circuits; the first end of the first differential bias circuit and the first end of the second differential bias circuit are used as the input end of the bias module together and are connected with the output end of the signal distribution and swing adjustment module; The second end of the first differential bias circuit and the second end of the second differential bias circuit are used as the output end of the bias module together and are connected with the input end of the signal strength detection module; The third terminal of the first one of the differential bias circuits is connected to the third terminal of the second one of the differential bias circuits.
6. The multi-stage automatic gain control loop of claim 5, wherein the differential biasing circuit comprises a first follower, a third resistor, and a fourth resistor; the non-inverting input end of the first follower is used as a first end of the differential bias circuit and is connected with the output end of the signal distribution and swing adjustment module; the inverting input end of the first follower is connected with the output end of the first follower and the first end of the third resistor; The second end of the third resistor is connected with the first end of the fourth resistor and is jointly used as the second end of the differential bias circuit to be connected with the input end of the signal intensity detection module; The second end of the fourth resistor is used as a third end of the differential bias circuit.
7. An electronic device comprising the multi-stage automatic gain control loop of any of claims 1-6.
8. A multi-stage automatic gain control loop control method applied to the multi-stage automatic gain control loop of claim 1, the method comprising: Controlling a variable gain amplifier to acquire a signal output by a mixer or a previous pole of the variable gain amplifier so as to enable the variable gain amplifier to amplify the signal at present; the control signal distribution and swing adjustment module obtains an amplified signal output by the corresponding variable gain amplifier at the current moment, and performs swing adjustment on the amplified signal; The control bias module obtains the swing signal output by the signal distribution and swing adjustment module, and carries out bias voltage adjustment on the swing signal; The control signal strength detection module acquires bias voltage corresponding to the bias signal output by the bias module, and outputs a corresponding high-low level signal according to the comparison condition of the bias voltage and the threshold voltage; and the control feedback processing module acquires the high-low level signals output by the signal intensity detection module, and outputs corresponding control signals according to the high-low level signals so as to control the corresponding variable gain amplifier to carry out gain adjustment at the current moment.
9. The method of claim 8, wherein outputting the corresponding high-low level signal according to the comparison of the bias voltage and the threshold voltage comprises: When the bias voltage is larger than the threshold voltage, the output high-low level signal is a high level signal; when the bias voltage is not greater than the threshold voltage, the high-low level signal is outputted as a low level signal.
10. The method of claim 8, wherein outputting the corresponding control signal according to the high-low level signal comprises: when the high-low level signal is a high level signal, outputting a gain reduction control signal so as to control the corresponding variable gain amplifier to perform gain reduction adjustment; And outputting a stop regulation control signal when the high-low level signal is a low level signal, and switching the time.

Description

Multistage automatic gain control loop, electronic equipment and control method Technical Field The present application relates to the field of communications, and in particular, to a multi-stage automatic gain control loop, an electronic device, and a control method. Background In a receive channel (RECEIVING CHANNEL, RX) of a communication system, due to communication range requirements, an automatic gain control loop (Automatic Gain Control, AGC) is typically required in the RX, and the signal swing into the RX channel is adjusted such that the swing of the intermediate frequency signal before entering the analog-to-digital converter (Analog to digital converter, ADC) is close to the full swing of the ADC samples. The AGC loop control hardware is mainly composed of a Variable gain amplifier (Variable GAIN AMPLIFIER, VGA), a signal strength detector (RECEIVED SIGNAL STRENGTH Indicator, RSSI), and other auxiliary devices. The RSSI monitors the swing amplitude of the VGA output signal, and feeds back the monitoring result to control the gain of the corresponding VGA again through corresponding logic conversion so as to realize the AGC function. In the AGC loop of the receiving channel, if only one-stage VGA is used, a VGA with larger gain dynamic is needed, and when the VGA gain is too large, the stability of the VGA is reduced, which affects the circuit performance. It is therefore common to divide the VGA into multiple stages of suitable gain, and typically each stage of VGA will be configured with an RSSI that is looped separately. However, in this case, since the input signal swing is increased step by step, the signal detection threshold of each stage of RSSI is different, and therefore, multiple RSSI needs to be independently designed to match the input signal with a specific swing to perform flip detection, which increases design complexity. And because the parameters of the RSSI of each stage are different, the mismatch existing in design and process is difficult to control, and the power consumption is increased. In view of the foregoing, it is a matter of urgent need for a multi-stage automatic gain control loop. Disclosure of Invention The application aims to provide a multistage automatic gain control loop, electronic equipment and a control method. The problem of the design difficulty that the variable gain amplifier in the traditional automatic gain control loop in the prior art corresponds to the signal strength detection module one by one can be solved. In order to solve the technical problems, in one aspect, the present application provides a multi-stage automatic gain control loop, including M variable gain amplifiers, a signal distribution and swing adjustment module, a bias module, and a signal strength detection module; The input end of the N-stage variable gain amplifier is connected with the output end of the N-1-stage variable gain amplifier, the input end of the first-stage variable gain amplifier is connected with the mixer, the output end of the M-stage variable gain amplifier is connected with the input end of the analog-to-digital converter, and N is an integer which is more than 1 and not more than M; The first pin end and the second pin end of each variable gain amplifier are connected with corresponding input ends in the signal distribution and swing adjustment module; The output end of the signal distribution and swing amplitude adjustment module is connected with the input end of the bias module; The output end of the bias module is connected with the input end of the signal intensity detection module; The output end of the signal intensity detection module is connected with the input end of the feedback processing module; and each output end of the feedback processing module is connected with the control end of each corresponding variable gain amplifier. Preferably, the signal distribution and swing adjustment module comprises a plurality of switch control circuits, wherein the number of the switch control circuits is the same as the number of the variable gain amplifiers; The first input end and the second input end of each switch control circuit are used as input ends of the signal distribution and swing adjustment module and are respectively connected with the first pin end and the second pin end of the corresponding variable gain amplifier; Each control end of each switch control circuit is connected with the corresponding control signal output end respectively; The third input end and the fourth input end of the N-th switch control circuit are connected with the first output end and the second output end of the N-1-th switch control circuit, and the first output end and the second output end of the M-th switch control circuit are used as the output ends of the signal distribution and swing adjustment module and are connected with the input end of the biasing module. Preferably, the switch control circuit comprises two differential control circuits with the same struct