lec23_marvelous

lec23_marvelous - 1 6.012 - Electronic Devices and Circuits...

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1 6.012 - Electronic Devices and Circuits Fall 2003 The marvelous CASCODE: V - V + Q 2 Q 1 v out - R L + R S v S + - cascode a two-transistor configuration formed of a common-emitter/ -source stage followed by a common- base/-gate stage The cascode is a very useful two-transistor stage that provides the performance of a common-emitter/-source stage with a much smaller Miller effect and much larger output resistance. The stage was first introduced to get better high-frequency performance, and the higher output resistance was viewed as a bonus; now designers take advantage of both features in a variety of situations. Miller Effect: Using a common-base/-gate stage, with its low input resistance, to load a common-emitter/source stage means that the voltage gain of the latter stage will be small, and so it will have a greatly reduced Miller effect. It will still
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2 have the same high input resistance and large current gain as before, however. The common-base/-gate member of this pair does not provide any additional current gain (i.e., its current gain is one), but it does provide voltage gain (as much as, or more
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This note was uploaded on 07/20/2009 for the course CSAIL 6.012 taught by Professor Prof.cliftonfonstadjr. during the Fall '03 term at MIT.

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lec23_marvelous - 1 6.012 - Electronic Devices and Circuits...

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