Baseband chip and automatic gain control method of baseband chip

Abstract

The invention provides a baseband chip and an automatic gain control method of the baseband chip. The baseband chip comprises an automatic gain control unit and a radio frequency control unit which are connected with a radio frequency chip, the automatic gain control unit comprises a saturation detection module, an RSSI (Received Signal Strength Indicator) calculation module and a gain calculation module, the saturation detection module is used for carrying out saturation detection on a radio frequency signal output by the radio frequency chip, and the RSSI calculation module is used for carrying out RSSI value calculation on the radio frequency signal output by the radio frequency chip; the gain calculation module is respectively connected with the saturation detection module and the RSSI calculation module, and calculates a gain value according to a saturation detection result and the RSSI value; and the radio frequency control unit is connected with the gain calculation module, and performs gain control on the radio frequency signal output by the radio frequency chip according to the gain value. According to the invention, gain control can be carried out on the radio frequency signal output to the baseband chip.

Description

technical field [0001] The present application relates to the technical field of computer communication, in particular to a baseband chip and an automatic gain control method for the baseband chip. Background technique [0002] Automatic Gain Control (AGC) is an automatic control method that automatically adjusts the gain of the amplifier circuit with the signal strength. When a weak signal is input, the linear amplifying circuit works to ensure the strength of the output signal; when the input signal reaches a certain strength, the compression amplifying circuit is started to reduce the output amplitude. That is to say, the AGC function can automatically control the magnitude of the gain by changing the input and output compression ratio. [0003] In the prior art, the most widely used one is to use the built-in AGC function of the RF chip to prevent the RF signal from being oversaturated or too small when it is output to the baseband, but the AGC function of some RF chips...

AI Technical Summary

Problems solved by technology

Although this solution can realize the basic functions of AGC, it requires a special controller to control the gain of the RF signal. This solution will increase the complexity of the RF circuit on the board. At the same time, its control implementation method is cumbersome, which increases additional control costs.

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