TECHNIQUES FOR UTILIZING A MULTIPLEXED STAGE-TWO AMPLIFIER TO IMPROVE POWER CONSUMPTION OF ANALOG FRONT-END CIRCUITS USED TO PROCESS BIOPOTENTIAL SIGNALS, AND WEARABLE DEVICES, SYSTEMS, AND METHODS OF USE THEREOF

An electronic device includes a plurality of sensor-amplifier-filter (SAF) assemblies. Each SAF assembly includes a neuromuscular-signal sensor configured to detect a neuromuscular signal, a stage-one amplifier configured to amplify the neuromuscular signal into a stage-one signal, and a passive filter configured to filter the stage-one signal into a filtered signal. The electronic device includes a multiplexer configured to receive a plurality of filtered signals from the plurality of SAF assemblies, output a first filtered signal of the plurality of received filtered signals as a multiplexed signal while a select signal has a first value, and output a second filtered signal of the plurality of received filtered signals as the multiplexed signal while the select signal has a second value. A stage-two amplifier is configured to amplify the multiplexed signal into a stage-two signal. The electronic device includes an analog-to-digital converter configured to convert the stage-two signal into a digital signal.