System Design of AC Open-Loop Gain Measurement of Amplifier

Abstract

Concerning the critical issue that how to measure the gain of AC open-loop of operational amplifier accurately, in the field of electronic measuring. The measure system design of the AC open-loop gain of amplifier is designed in the paper based on labVIEW. The system consists of two parts of hardware and software. The hardware is composed by the multifunctional signal source, the low noise preamplifier, the awaiting measured amplifier, the data acquisition card and the computer; the software is composed by the human-computer interface program, measurement program and data post-processing. Using the virtual instrument cross-correlation detection technology, it can measure the gain of amplifier AC open-loop accurately, with the function of acquisition, measurement, real-time display and playback, constituting a programming flexibility, concise and efficient, accurate measurement, higher resolution, steady performance personalized automatic measurement system.