Low-Cost Fast-Start Amplifier Architecture for AC-Coupled Measurement of Low-Frequency Signals
IEEE SENSORS LETTERS(2024)
Abstract
As sensors become more widely deployed around humans, radar sensors have seen considerable use as a method of measuring low-frequency body motions, such as heartbeat, respiration, and gesture commands. These sensors, however, can suffer from long startup times due to the need to preserve low-frequency information. This letter presents a fast-start amplifier architecture that leverages low-cost components in a simple architecture to improve the startup time of practical sensors without impacting low-frequency response. The theory of the fast-start circuit is presented and verified through simulation to demonstrate the startup time improvement offered by the architecture. The system is then evaluated experimentally using a custom test board, with results showing an improvement in startup time compared with traditional amplifier architectures, which makes it highly useful for low-cost, low-frequency motion sensors.
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Key words
Schottky diodes,Sensors,Gain,Radar,Capacitors,Computer architecture,Baseband,Sensor applications,amplifier architectures,analog fast start,baseband amplifier,fast-start sensors,low cost,passive fast start,radar
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