Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1980-06-30
1982-11-30
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330257, 330278, 330288, H03G 330
Patent
active
043618154
ABSTRACT:
An operational amplifier includes a differential-input amplifier stage supplying first and second drive currents responsive to input signals applied to its input connections. A first current amplifier exhibiting gain factor G supplies currents to an output terminal responsive to the first drive current, and a second current amplifier exhibiting gain factor H supplies currents to that output terminal responsive to the second drive current. Each of the first and second current amplifiers includes means for switching the value of its respective gain factor G or H between a plurality of values responsive to a control signal, so the gain of the operational amplifier is programmable responsive to the control signal.
REFERENCES:
patent: 3921090 (1975-11-01), Wheatley, Jr. et al.
patent: 4064506 (1977-12-01), Cartwright, Jr.
patent: 4117416 (1978-09-01), Schade, Jr.
patent: 4160944 (1979-07-01), Ahmed
Wittlinger, H. A. "Applications of the CA3080 and CA3080A High-Performance Operational Transconductance Amplifiers", ICAN-6668, RCA Linear Integrated Circuits, SSD-202C, 1975, pp. 411-426.
Intersil, Inc., "ICL761X, 762X, 763X, 764X Low Power MAXMOS Operational Amplifiers", 1979, pp. 1-5 and 12-13.
Berard Jr. Clement A.
Mullins James B.
Rasmussen Paul J.
RCA Corporation
Whitacre Eugene M.
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