Precision emitter follower

Details Precision emitter follower Precision emitter follower

1999-01-28

2000-05-16

Pascal, Robert

Amplifiers

With semiconductor amplifying device

Including current mirror amplifier

330296, H03F 304

Patent

active

060642688

ABSTRACT:
A first current source supplies current to the collector of an emitter follower stage and a sense transistor. The sense transistor programs a current mirror so that most of the base current required by the emitter follower transistor comes from the current mirror instead of the input. A second current source that requires more current that the first current source supplies is connected to the output of the emitter follower and sinks the current coming out of the emitter of the emitter follower and the collector current of a load transistor. The load transistor supplies the difference in current between the amount of current supplied by the first current source and the amount sunk by the second current source.

REFERENCES:
patent: 4891607 (1990-01-01), Felps
patent: 5448770 (1995-09-01), Hietala et al.
patent: 5637993 (1997-06-01), Whitney et al.
patent: 5812029 (1998-09-01), Prentice
patent: 5923217 (1995-09-01), Durec
Data Sheet from OP-07, Made by Analog Devices, Ultralow Offset Voltage Operational Amplifier, OP07; pp. 1-10.

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