27-06-2017, 02:54 PM
In electronics, a common-base amplifier (also known as grounded-base) is one of three basic topologies of single-stage bipolar junction transistor (BJT) amplifiers, typically used as a current buffer or voltage amplifier.
In this circuit the emitter terminal of the transistor serves as input, the collector as output and the base is grounded, or "common", hence its name. The field effect transistor analog circuit is the common door amplifier.
As the current sinks from the emitter, this provides the potential difference by causing the transistor to conduct. The current conducted through the collector is proportional to the voltage across the base-emitter junction, representing the bias, as with other configurations.