Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1985-10-04
1987-10-13
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including differential amplifier
323316, 330288, H03F 318
Patent
active
047001445
ABSTRACT:
A differential amplifier feedback current mirror includes a feedback current source that provides a correction current to one input of a differential amplifier. The correction current is synthesized by comparing a sample of the current delivered by a string of controlled current sources to a reference current set up by a constant current source. A current driver is included in the differential amplifier feedback loop and a current source buss is driven by the current driver. The feedback configuration assures that the current delivered by the dependent controlled current sources accurately tracks the current established by the reference current source, irrespective of the base current offset attributable to each of the dependent controlled current sources.
REFERENCES:
patent: 3962592 (1976-06-01), Thommen et al.
patent: 4437023 (1984-03-01), Gill, Jr.
GTE Communication Systems Corporation
Mullins James B.
Odozynski John A.
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