一、前言用交流电桥测量挣态电容以及最近用 LCR表测量电容都是基于同步检测技术。但是,目前在电容传感器的应用中非常需要更简单的电容表。本文介绍的 CV 变换器是基于负反馈技术。由于被测电容接于运放的反馈支路中,所以使不可避免的引线寄生电容以及测试夹具等对 I. INTRODUCTION Measuring acoustoelectric capacitance with ac bridges and the recent measurement of capacitance with LCR meters are based on synchronous detection techniques. However, there is a great need for simpler capacitance meters in capacitive sensor applications. This article describes the CV converter is based on the negative feedback technology. Since the measured capacitance is connected to the feedback branch of the op amp, the unavoidable parasitic capacitance of the lead and the test fixture