High-precision digital automatic gain control device and radio frequency receiver

Abstract

The invention provides a high-precision digital automatic gain control device and a radio frequency receiver. A gain control unit of the high-precision digital automatic gain control device is respectively connected with a gain module and an analog-to-digital converter; a signal processing module converts a radio frequency signal into an intermediate frequency and then sends the intermediate frequency to the gain module, and the analog-to-digital converter performs analog-to-digital conversion on the signal subjected to gain processing by the gain module; and a power accumulation module of the gain control unit is connected with the analog-to-digital converter and accumulates instantaneous power of the digital signal to generate a total power value, and an automatic gain control circuit is connected with the power accumulation module and a gain module and outputs a gain adjustment signal to the gain module according to a comparison result of the total power value and a target power value. According to the analog-to-digital converter, accurate calculation of the power can be converted into digital domain for processing, the precision requirement on the analog-to-digital converter is greatly reduced, the design difficulty and the calculation accuracy are reduced, the structure is simple, the power consumption is low, and the purpose of accurately controlling the output power is achieved.

Description

technical field [0001] The invention relates to the field of gain control, in particular to a high-precision digital automatic gain control device and a radio frequency receiver. Background technique [0002] Due to the influence of environmental factors such as propagation path attenuation, the signal power received by the radio frequency receiver varies greatly. In addition, in the existing environment, various communication systems coexist and the environment is complex, and it is inevitable that interference signals fall into the signal band of the receiver. In order to give full play to the dynamic performance of the analog-to-digital converter in the radio frequency receiver and ensure the signal quality of the receiver, the receiver needs to perform automatic gain control according to the signal power to ensure that the receiver circuits at all levels are in the correct working state. [0003] There are two automatic gain control methods for existing RF receivers. On...

AI Technical Summary

Problems solved by technology

In some receiver architectures that use low-precision analog-to-digital converters, the use of this automatic gain control scheme will cause large changes in the output power of the analog intermediate frequency, so that the circuits at all levels of the receiver cannot be in the correct working state

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