Common Source

Common Source

Inf electronics, a common-source amplifier is one of three basic single-stage field-effect transistor (FET) amplifier topologies, typically used as a voltage or transconductance amplifier. The easiest way to tell if a FET is common source, common drain, or common gate is to examine where the signal enters and leaves. The remaining terminal is what is known as "common". In this example, the signal enters the gate, and exits the drain. The only terminal remaining is the source. This is a common-source FET circuit. The analogous bipolar junction transistor circuit is the common-emitter amplifier.

The common-source (CS) amplifier may be viewed as a transconductance amplifier or as a voltage amplifier. (See classification of amplifiers). As a transconductance amplifier, the input voltage is seen as modulating the current going to the load. As a voltage amplifier, input voltage modulates the amount of current flowing through the FET, changing the voltage across the output resistance according to Ohm's law. However, the FET device's output resistance typically is not high enough for a reasonable transconductance amplifier (ideally infinite), nor low enough for a decent voltage amplifier (ideally zero). Another major drawback is the amplifier's limited high-frequency response. Therefore, in practice the output often is routed through either a voltage follower (common-drain or CD stage), or a current follower (common-gate or CG stage), to obtain more favorable output and frequency characteristics. The CS–CG combination is called a cascode amplifier.

Read more about Common Source:  Characteristics

Other articles related to "common, common source, source":

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... The bandwidth of the common-source amplifier tends to be low, due to high capacitance resulting from the Miller effect ... Figure 3 shows a MOSFET common-source amplifier with an active load ... transistor capacitance Cgd between gate and drain and the series resistance of the source RA ...
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... In a publication of 1647, Marcus Zuerius van Boxhorn proposed the existence of a primitive common language he called "Scythian" ... should be eliminated in comparative studies, and also correctly put great emphasis on common morphological systems and irregularity as indicators of relationship ... already used the expression ex eadem origine (from a common source) in a 1640 study relating European languages to Indo-Iranian ...

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