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微电流宽频带前置放大器,系我院自动化系研制的一台多点连续自动记录仪中的一个组成单元,它的作用是将收集来的快速变化的微电流信号变换成电压信号,然后传递给记录仪进行观察记录。它实际上是一个由运算放大器组成的电流-电压变换器。由于输入信号小,变化快,而且有数米远的传输线影响,因此要求该前置放大器具有低噪声,宽频带,高增益并且须有一定的抗共模干扰的能力。
The micro-current broadband preamplifier is a component unit of a multi-point continuous automatic recorder developed by Department of Automation of our hospital. Its function is to convert the collected rapidly changing micro-current signals into voltage signals and then transmit them Record and record the recorder. It is actually a current-to-voltage converter made up of operational amplifiers. Because of the small input signal, rapid change, and transmission lines that are several meters away, the preamplifier is required to have low noise, wideband, high gain and a certain degree of immunity to common mode interference.