Configurable received signal strength indicating circuit

Abstract

The invention discloses a configurable received signal strength indicating circuit and belongs to the technical field of integrated circuits. The circuit comprises a subtracter, a limiting amplifier chain, a full-wave rectifier, an output buffer and a direct-current detuning extract circuit, wherein the direct-current detuning extract circuit is used for extracting a direct-current detuning voltage; the subtracter is used for subtracting an input intermediate-frequency signal and the direct-current detuning voltage and respectively outputting the obtained signals to the limiting amplifier chain and the full-wave rectifier; the output signal of each limiting amplifier in the limiting amplifier chain can be input into the full-wave rectifier; the output signals of the limiting amplifier chain can be respectively inputted in the direct-current detuning extract circuit and the output buffer; the output buffer outputs the intermediate-frequency signal, and the full-wave rectifier outputs a received signal strength indicating signal. The configurable received signal strength indicating circuit provided by the invention can occupy small layout area and work stably and reliably, can be applied to low-intermediate frequency and zero-intermediate frequency receivers at the same time, and is especially applicable to the zero-intermediate frequency application.

Description

technical field [0001] The invention relates to the technical field of integrated circuits, in particular to a configurable receiving signal strength indicating circuit. Background technique [0002] With the development of wireless communication, people have higher and higher requirements for low power consumption and low cost. Since the strength of the signal received by the receiver will vary in a wide range, it is necessary to control the strength of the signal under the premise of ensuring the bit error rate, so as to save power consumption and prolong the service life of the battery. The gain of the variable gain amplifier is controlled by detecting the strength of the received signal to achieve the purpose of power strength control and obtain a stable output signal strength. [0003] The Received Signal Strength Indication (RSSI) circuit is a commonly used module in optical communication systems and radio frequency communication systems. It is used for power detectio...

AI Technical Summary

Problems solved by technology

To sum up, the prior art RSSI circuit has various defects: large layout area, high lower cut-off frequency and difficult to determine, poor integration, many external components, poor passband flatness, etc.

Images