一种低噪声前置放大器的设计

The design of a sort of low noise preamplifier

本文介绍一种利用负反馈原理由集成运算放大器构成的低噪声、高共模抑制比、高输入阻抚前置放大器。该放大器的等效输人噪声小于5微伏,具有电路简单,调试方便、价格低廉等特点,可用于检测心室晚电位、希氏束电位等微弱生理电信号。

This paper presents an up-to-date design of bioelectric preamplifier with low noise- high common-mode-rejection ratio (CMRR) and high impedance. It can measure weak signals, its equiva, lent input noise is smaller than 5μv. Also, practical design of the amplifier is given.