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T O P I C    R E V I E W
psycho Posted - Apr 28 2009 : 7:57:36 PM
Can anybody explain how the cascode transistor is used to reduce the effect of miller capacitance and increase the bandwidth?
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audioguru Posted - Apr 29 2009 : 12:34:56 PM
In a cascode, the lower transistor is a common-emitter voltage to current converter. Its collector has a variable current, not a variable voltage so its Miller negative feedback is extremely low.

The upper transistor operates in the common-base mode so its base is grounded and stops negative feedback in the capacitance from its collector to its base from forming.

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