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A 20-b 40-mV Range Read-Out IC With 50-nV Offset and 004 Gain Error for Bridge T
一款20位精度、40mV量程的桥式传感器读出IC，具有50nV偏移和0.04%增益误差。
20位精度, 40mV量程, 50nV偏移, 0.04%增益误差, 140dB CMRR, 0.7ppm/°C增益漂移
桥式传感器读出IC电流反馈仪表放大器斩波技术动态元件匹配
▸电流反馈仪表放大器(CFIA)结合斩波技术降低偏移和噪声
▸动态元件匹配提高增益精度和漂移
▸数字辅助校正环进一步降低增益漂移
Abstract
This paper presents a 20-b read-out IC with 40-mV
full-scale range that is intended for use with bridge transducers. It
consists of a current-fee dback instrumentation ampli fier (CFIA)
followed by a switched-capacitor incremental
ADC. The
CFIA’s offset and noise are mitigated by chopping, while its
gain accuracy and gain d rift are improved by applying dynamic
element matching to its input and feedback transconductors.
Their mismatch is reduced by a digitally assisted correction loop,
which furt