emitter follower

[i′mid·ər ‚fäl·ə·wər] (electronics) A grounded-collector transistor amplifier which provides less than unity voltage gain but high input resistance and low output resistance, and which is similar to a cathode follower in its operations.

Emitter follower

A circuit that uses a common-collector transistor amplifier stage with unity voltage gain, large input resistance R_i, and small output resistance R_o (see illustration). In its behavior, the emitter follower is analogous and very similar to the source follower in metal-oxide-semiconductor (MOS) circuits. Many electronic circuits have a relatively high output resistances and cannot deliver adequate power to a low-resistance load, or do suffer unacceptable voltage attenuation. In these cases, an emitter follower acts as a very simple buffer. Widely used, it is often found as the last stage of a multistage amplifier so that the circuit is better able to drive a low-resistance load. See Amplifier

Schematic diagram of an emitter follower circuit

单词	emitter follower
释义	emitter follower emitter follower [i′mid·ər ‚fäl·ə·wər] (electronics) A grounded-collector transistor amplifier which provides less than unity voltage gain but high input resistance and low output resistance, and which is similar to a cathode follower in its operations. Emitter follower A circuit that uses a common-collector transistor amplifier stage with unity voltage gain, large input resistance R_i, and small output resistance R_o (see illustration). In its behavior, the emitter follower is analogous and very similar to the source follower in metal-oxide-semiconductor (MOS) circuits. Many electronic circuits have a relatively high output resistances and cannot deliver adequate power to a low-resistance load, or do suffer unacceptable voltage attenuation. In these cases, an emitter follower acts as a very simple buffer. Widely used, it is often found as the last stage of a multistage amplifier so that the circuit is better able to drive a low-resistance load. See Amplifier Schematic diagram of an emitter follower circuit AcronymsSeeelectron flow
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