A Capacitively Coupled Chopper Instrumentation

📋 论文概要

提出了一种电容耦合斩波仪表放大器（CCIA），用于电流检测应用，实现了±30V的输入共模范围和小于5µV的输入失调，同时具有超过160dB的共模抑制比（CMRR），且无需高压电源。该放大器采用0.7µm高压CMOS工艺，功耗仅26µA，适用于电源管理系统。

📄 原文摘要

(CCIA) for current-sensing applications. A capacitively driven input chopper enables a ±30V input common-mode (CM) range and an input offset less than 5µV. The CCIA does not draw supply current from its input terminals or require a separate high-voltage (HV) supply; and has a common-mode rejection ratio (CMRR) in excess of 160dB, both of which represent significant improvements on the state-of-the-art [1-3]. Implemented in a HV CMOS 0.7µm technology, the CCIA achieves an NEF of 6.1 (6.5× better than [1-3]), while drawing only 26µA from a 3V supply. The CCIA is intended for power management systems, in which battery current is monitored via a small series resistor. This requires an instrumentation amplifier (IA) with wide input CM range, micro-volt offset, high CMRR, and very

👥 作者与机构

Amplifier with a ±30V Common-Mode Range, 160dB, CMRR and 5µV Offset

Qinwen Fan, Johan Huijsing, Kofi Makinwa Delft University of Technology, Delft, The Netherlands This paper describes a capacitively coupled chopper instrumentation amplifier