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我们所说的微电压放大电路,就是“高输入阻抗”电路,其输入阻抗由非倒相输入型放大器所构成的反馈电路来获得,约数10MΩ～数GΩ。通常的“高输入阻抗”电路,多数以FET输入型运算放大器所构成,其阻抗由输入偏置电流的大小所决定。一、微电流放大电路的型式微电流放大电路有两种型式,即如图1所示之电压放大型电流/电压变换电路和如图2所示之电流放大型电流/电压变换电路。下面,分别介绍这两种电路型式。
We call the micro-voltage amplifier circuit is the “high input impedance” circuit, the input impedance of non-inverting input amplifier posed by the feedback circuit to obtain, the number of 10MΩ ~ several GΩ. The usual “high input impedance” circuit, the majority of FET input type op amp posed by the impedance of the input bias current is determined by the size. First, the type of micro-current amplifier circuit There are two types of micro-current amplifier circuit, as shown in Figure 1, the voltage amplification current / voltage conversion circuit and shown in Figure 2, the current amplification current / voltage conversion circuit. Here are the introduction of these two circuit types.