Automatic gain control circuit, integrated circuit, electronic device and automatic gain control method

Abstract

The present invention provides an automatic gain control circuit, an integrated circuit, an electronic device and an automatic gain control method, wherein the automatic gain control circuit includes: an input gain stage for receiving or amplifying an analog input signal; an analog-to-digital conversion device for receiving an amplified analog input signal and providing a digital output signal; and an overload management module for receiving the digital output signal from the analog-to-digital converter; determining the amplified analog output signal based on the digital output signal Whether the input signal exceeds an operation range of the analog-to-digital converter; and according to the determination result, providing a first control signal to the input gain stage to adjust a gain of the input gain stage. Using this technical solution, signal integrity issues that might otherwise occur before the AGC has had time to adjust the overall gain of the system can be prevented.

Description

technical field [0001] The present invention relates to an analog-to-digital converter (ADC) circuit, an integrated circuit, an electronic device (such as a wireless communication unit) and a method for managing overload conditions of the ADC. The invention is applicable to, but not limited to, an integrated circuit including an ADC for modem applications in a wireless communication unit. Background technique [0002] In the field of wireless communication systems and communication units, the wireless communication systems and communication units include transmitter and receiver functions. A typical part of the receiver part is an Automatic Gain Control (AGC) loop. The AGC loop is generally used to keep the signal level sufficient to pass through the signal path and avoid saturating any part of the receiver, while maximizing a signal-to-noise ratio (SNR) required in the best operating conditions of the receiver. ). The AGC loop circuit and any associated algorithm (algorit...

AI Technical Summary

Problems solved by technology

However, when it tries to recover, if the large input signal condition is not removed, the ADC will cycle repeatedly between reset and recovery, as shown in filter output waveform 310, and due to AGC overload detection, for repeated clipping of 325, the resulting output may look ambiguous

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