Analog Front-end for EMG Acquisition System

초록

This paper presents a four-channel analog front-end (AFE) for electromyogram (EMG) acquisition systems. Each input channel consists of a chopper-stabilized instrumentation amplifier (IA) and a low-pass filter (LPF). A 16-bit analog-to-digital converter (ADC) is shared between four-input channels through a 4-to-1 multiplexer and a buffer amplifier. To achieve a 16-bit resolution, a second-order feed-forward incremental ADC (IADC) with a 1.5-bit quantizer is employed. The prototype AFE is fabricated in a 0.18 mu m CMOS process with an active die area of 1.4 mm(2). It achieves a 1.12 mu V-RMS input referred noise with an input channel gain of 44 dB and an LPF cutoff frequency of 500 Hz, while consuming 615 mu W/channel from a 1.8 V supply.

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