Amplifiers – With semiconductor amplifying device – Including current mirror amplifier
Patent
1996-04-23
1998-02-24
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including current mirror amplifier
323315, 330307, H03F 304
Patent
active
057215120
ABSTRACT:
A bipolar transistor current mirror circuit has the bases of its input and output transistors connected together, but decouples the input transistor's collector from its base so that the mirror input voltage is no longer tied to the input transistor's base-emitter voltage. Instead, a separate base current source supplies sufficient base current to the mirror's input transistor to keep it in saturation, while a parasitic transistor that results from a junction isolated fabrication process drains off excess current from the base current source to keep it in balance with the mirror transistor base currents. The resulting input voltage is a function of the input transistor's saturated collector-emitter voltage, which is substantially lower than the base-emitter voltage and provides more voltage head room.
REFERENCES:
patent: 4051391 (1977-09-01), Ahmed
patent: 4870533 (1989-09-01), Bahlmann
patent: 4937515 (1990-06-01), Yoshino
The Circuits and Filters Handbook, ed. Wai-Kai Chen, CRC Press, 1995, pp. 1619-1624.
Electronics Engineers' Handbook, ed. by Fink and Christiansen, McGraw Hill Book Company, 1989, pp. 8-11 through 8-12.
Analog Devices Inc.
Mullins James B.
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