FET Common Source Amplifier Circuit
- details of the common source amplifier circuit based around FET technology.
FET circuit design tutorial includes:• FET design basics • FET circuit configurations • FET common source • FET common drain / source follower • FET common gate
Common source FET configuration is probably the most widely used of all the FET circuit configurations.
Like its bipolar counterpart the common emitter circuit, the FET common source amplifier provides a good level of all round performance for many applications.
The common source circuit provides a medium input and output impedance levels. Both current and voltage gain can be described as medium, but the output is the inverse of the input, i.e. 180° phase change. This provides a good overall performance and as such it is often thought of as the most widely used configuration.
Basic diagram of the common source FET amplifier circuit
Common source FET amplifier characteristics summary
The table below gives a summary of the major characteristics of the common source amplifier.
|Common source amplifier characteristics|
|Input / output phase relationship||180°|
** Note: the input resistance for a FET itself is very high in view of the fact that it takes virtually no current.
By Ian Poole
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