Unity-gain, wide bandwidth, bipolar voltage follower with a very

Details Unity-gain, wide bandwidth, bipolar voltage follower with a very Unity-gain, wide bandwidth, bipolar voltage follower with a very

1993-01-29

1994-04-12

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including particular biasing arrangement

330288, 330310, H03F 156

Patent

active

053029151

ABSTRACT:
A voltage-follower circuit has an input biasing stage that generates an input stage bias current and a tracking bias current. An input stage generates an intermediate voltage signal and sources an input current in response to an input voltage signal and the input stage bias current. An output biasing stage generates an output bias current. An output biasing stage generates an output voltage signal and sinks a portion of the input bias current in response to the intermediate voltage signal and the output bias current. A cancellation stage sinks substantially all of the input current in response to the tracking bias current. A cascode stage isolates the input biasing stage from the input stage and the cancellation stage. A compensation stage sinks a portion of the tracking bias current which is substantially equivalent to the portion of the input bias current sunk by the output stage.

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