443 / 2019-02-27 12:28:11

A 16-bit 64-channel ADC without Input Impedance Transformation for Measurement System

multi-channel adc,measurement system,impedance matching

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A multiplexed 16-bit 64-channel ADC for multi- sensors measurement system is presented. In order to achieve ultra-high input impedance for directly interfacing with multi-type sensors without input impedance transformation buffers used in conventional designs. A dual signal-processing path architecture and a data fusion algorithm are utilized in this work for signal conditioning and quantization. Through the above solutions, this ADC saves considerable amount of power consumption and area cost, therefore enables much more channels and easier system integration. A prototype circuit has been designed in 0.18μm CMOS process. Simulation results reveal 98.2dB total harmonic distortion (THD) and 14.8-bit ENOB with full-scale input at 1MSPS.