how does cherry-hopper amplifier increase bandwidth?

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flushrat

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cherry hopper

Could anyone explain it?
 

cherry hooper amplifier

Here is one link. Your spelling the second name improperly has kept you from doing an internet search. The second name should be Hooper.

**broken link removed**

An intuitive explanation is that this works very much like the cascode circuit. In the cascode the input stages produces small signal output current that is fed into the emitter of a grounded base stage (low impedance). In the C-H the input stage feeds current into a transimpedance amplifier which has nearly zero input impedance.

One amusing sideline is that five years after the famous paper these two authors wrote a 1000 page book on amplifiers and this configuration is not in it.
 

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