Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1988-10-11
1990-01-09
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330264, 330268, 330288, H03F 345, H03F 330
Patent
active
048930911
ABSTRACT:
A complementary current mirror includes a PNP transistor and an NPN transistor, one of which serves as a control transistor and the other of which serves as an output transistor. A V.sub.BE voltage generated by forcing a control current into or out of the emitter of the control transistor is imposed between the base and emitter of the output transistor to produce a controlled current in the collector of the output transistor. A first such current mirror, with an NPN control transistor, and a second such current mirror, with a PNP control transistor, are driven by the same control current to supply first and second input bias currents to a diamond follower circuit in the same integrated circuit as the first and second current mirror circuits to face the V.sub.BE voltage of the PNP and NPN transistors of the diamond follower circuit to be equal despite variation in saturation currents of the PNP and NPN transistsors. This results in zero input offset for the diamond follower circuit.
REFERENCES:
patent: T934009 (1975-05-01), Sheng
patent: 4325019 (1982-04-01), Tezuka
patent: 4502020 (1985-02-01), Nelson et al.
patent: 4540950 (1985-09-01), Ross
patent: 4540951 (1985-09-01), Ozawa et al.
patent: 4639685 (1987-01-01), Saller et al.
Lillis William J.
Wang Anthony D.
Burr-Brown Corporation
Mullins James B.
LandOfFree
Complementary current mirror for correcting input offset voltage does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Complementary current mirror for correcting input offset voltage, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Complementary current mirror for correcting input offset voltage will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-147263