A voltage-series feedback amplifier (also known as a voltage feedback amplifier with series feedback) is characterized by applying the feedback voltage in series with the input. This configuration reduces the overall gain but improves the stability and linearity of the amplifier.
In a voltage-series feedback amplifier:
- The feedback is taken from the output and applied to the inverting input terminal.
- The input signal is applied to the non-inverting input terminal of the op-amp.
- The amplifier maintains the same voltage gain but with higher stability, reduced distortion, and more predictable performance compared to an open-loop configuration.
The primary purpose of this configuration is to stabilize the amplifier's gain by reducing the impact of component variations and ensuring better linearity in the output signal.