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An Energy-Efficient 37-nVpHz Bridge Readout IC
本文介绍了一种高效能的桥式读出集成电路，具有低噪声和高线性度。
输入噪声密度3.7 nV/√Hz，噪声效率因子5，功率效率因子44
桥式读出IC电容耦合仪表放大器连续时间ΔΣ调制器噪声效率因子温度补偿
▸利用CCIA阻断直流共模电压
▸采用双路径正反馈提高输入阻抗
▸使用温度补偿方案减少传感器偏移漂移
Abstract
This paper describes an energy-efficient bridge
readout IC (ROIC), which consists of a capacitively coupled
instrumentation amplifier (CCIA) that drives a continuous-time
delta–sigma modulator (CTM). By exploiting the CCIA’s abil-
ity to block dc common-mode voltages, the bridge’s bias voltage
may exceed the ROIC’s supply voltage, allowing these voltages
to be independently optimized. Since bridge output is typically
much smaller than bridge offset, a digital to analog converter
(DAC) is used to