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该论文提出了一种用于双向高端电流检测的电流反馈仪表放大器，通过结合斩波和自稳零技术实现了5µV的超低输入失调电压，有效减小了检测电阻的功耗并提高了精度。
For power management in mobile systems, the supply current is often measured through a small sense resistor in series with the positive power supply. The voltage across this high-side sense resistor is then amplified and referred to ground by a currentsense amplifier. To minimize the sense-resistor’s value and its power dissipation, two specifications for this amplifier are critical: the input offset voltage and common-mode rejection ratio (CMRR). This paper presents an instrumentation amplifier for high-side current-sensing applications. Chopping and auto-zeroing are used to achieve an offset voltage of less then 5μV over a CM input voltage range of 28V. It employs an indirect current-feedback topology, which isolates the input and output CM voltages [1], and achieves a CMRR of 140dB. In contrast to a recently announced low-offset current-sense amplifier [2], the chosen topology enables bidirectional current-sensing, e.g., of the current through a rechargeable
J. F. Witte, J. H. Huijsing, K. A. A. Makinwa
Delft University of Technology, Delft, Netherlands