In this paper, the electric circuit of linear negative resistance was designed with operational amplifier, and its characters. Special stability condition, were analysed.
本文给出用运算放大器实现负电阻的实验电路及其分析，主要讨论电路的稳定条件。
This paper introduces the operating principle of two special digital audio processors, and then describes several circuit designs of high quality digital audio voltage amplifier.
首先介绍了两种专用数字音频处理器的性能特点和原理，然后阐述高品质数字音频电压放大器的几种电路设计方案。
AD515A, the special electrometer operational amplifier, is introduced in this paper. And we proposed one high accuracy real-time measurement accumulation voltage method based on AD515A.
本文介绍了静电计专用集成运放ad515a的结构特点，并且提出了一种基于AD515A的高精度实时测量累计电压的方法。
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