Received signal strength detection circuit and method

Abstract

An embodiment of the invention provides a received signal strength detection circuit and method. The circuit comprises a ripple-suppressed OOK signal amplitude detection module and a time domain analog-to-digital conversion module, wherein the OOK signal amplitude detection module for ripple suppression receives an OOK receiving signal, converts the OOK receiving signal into a direct-current analog amplitude signal, and suppresses alternating-current ripples in the conversion process; the time domain analog-to-digital conversion module converts the DC analog amplitude signal into an amplitudefrequency modulation signal, measures the frequency of the amplitude frequency modulation signal, and outputs a digital amplitude signal representing a measurement result. According to the circuit disclosed in the embodiment of the invention, the OOK signal amplitude detection module for ripple suppression can be used to perform high-efficiency and high-precision sampling on the OOK signal amplitude; sampling ripple interference can be effectively reduced, conversion from sampling voltage to frequency signals is achieved through the time domain analog-digital conversion module, low-frequency noise can be greatly restrained, and therefore ultra-low-power-consumption received signal strength detection is achieved.

Description

technical field [0001] Embodiments of the present invention relate to the technical field of wireless body area networks, and more specifically, to a received signal strength detection circuit and method. Background technique [0002] Wireless body area network is a dedicated wireless communication system for devices around the human body such as watches, sensors, and mobile phones, as well as implanted devices inside the human body. In recent years, wireless body area network communication technology has gained a lot of attention. Follow and study. In the body area network receiver circuit, the received signal strength detection (Received SignalStrength Indication, RSSI) circuit can be used to estimate the strength of the received signal, and then realize the closed-loop automatic gain control through the front-end adjustable gain amplifier circuit, which is the whole receiver One of the key modules in the link. [0003] Due to the limitations of wireless body area networ...

AI Technical Summary

Problems solved by technology

A low-power RSSI circuit disclosed in the prior art adopts the cascaded form of multi-stage limiting amplifiers, and each stage requires an RC low-pass filter circuit, resulting in large area cost and unstable performance

There is also a low-power RSSI circuit based on current multiplexing technology, which uses the current superposition principle to reduce the overall power consumption of the RSSI module, but because it needs to use SAR-ADC for analog-to-digital conversion, it limits the further reduction of overall circuit power consumption

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