![cover image](https://wikiwandv2-19431.kxcdn.com/_next/image?url=https://upload.wikimedia.org/wikipedia/commons/thumb/a/a0/NPN_common_emitter.svg/640px-NPN_common_emitter.svg.png&w=640&q=50)
Common emitter
Type of electronic amplifier using a bipolar junction transistor / From Wikipedia, the free encyclopedia
Dear Wikiwand AI, let's keep it short by simply answering these key questions:
Can you list the top facts and stats about Common emitter?
Summarize this article for a 10 year old
In electronics, a common-emitter amplifier is one of three basic single-stage bipolar-junction-transistor (BJT) amplifier topologies, typically used as a voltage amplifier. It offers high current gain (typically 200), medium input resistance and a high output resistance. The output of a common emitter amplifier is inverted; i.e. for a sine wave input signal, the output signal is 180 degrees out of phase with respect to the input.[1]
![]() | This article includes a list of general references, but it lacks sufficient corresponding inline citations. (December 2008) |
![](http://upload.wikimedia.org/wikipedia/commons/thumb/a/a0/NPN_common_emitter.svg/130px-NPN_common_emitter.svg.png)
In this circuit, the base terminal of the transistor serves as the input, the collector is the output, and the emitter is common to both (for example, it may be tied to ground reference or a power supply rail), hence its name. The analogous FET circuit is the common-source amplifier, and the analogous tube circuit is the common-cathode amplifier.