Operational Amplifier-homogeneous Amplifier

Is the same phase voltage amplifier. Note that the input voltage VI is added to the same phase input end. Because the input voltage is almost zero, VI is actually the inverse input voltage. Therefore, the KCl equation of the inverse input end is:

VI/RA + (Vi-vo) Rf = 0, export Vo = (1 + RF/RA) * VI

 

This type of amplifier is not reversed, and the voltage gain of this amplifier is slightly larger than that of the reverse amplifier for the same resistance. Compared with a reversed-phase amplifier, a major advantage of this circuit is that the input resistance is particularly high. Therefore, if the output resistance of the signal source is very high, it is more appropriate to use this amplifier as a voltage amplification, the amplifier can easily zoom in the power supply voltage with a large output resistance. In contrast, if a reversed-phase amplifier is used, almost all source voltages are consumed by the two ends of the large output resistance of the source.