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在许多精度要求较高的测量、控制电路里,不仅需要对输入信号整流或峰值检波,还需要放大变换后的电压.更多的还要将经变换后的电压与基准电压进行比较,再对误差电压进行放大,以期获得精确的误差放大量,以利于测定和控制.随着运算放大器的广泛应用,在控制电路中,使用运算放大器构成精确的全波整流放大电路,已经成为电路工作者比较喜欢采用的一种电路形式了.但一般需要二只运算放大器,一只做为整流,一只做为电压放大.
In many high precision measurement and control circuits, it not only needs to rectify or peak the input signal, but also needs to amplify the transformed voltage. More and more, the transformed voltage is compared with the reference voltage. Error voltage amplification, in order to obtain accurate error amplification, in order to facilitate the determination and control.With the extensive application of op-amp, in the control circuit, the use of operational amplifier to form an accurate full-wave rectifier amplifier, circuit workers have become more Like to use a form of circuit, but generally require two op amps, one for rectification, one for voltage amplification.