Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1982-05-24
1984-07-24
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330257, 330261, 330259, H03F 345
Patent
active
044620020
ABSTRACT:
Imbalances in the potential appearing across the drain electrodes of source coupled FET transistors arranged in a differential amplifier configuration tends to produce input offset voltages. Where the drain electrodes of the transistors are coupled to a current mirror load for converting balanced signals to a single ended output which in turn is applied to a common source amplifier, the input offset may be nulled by differentially adjusting the drain current of the common source amplifier against the source current of the differential stage.
REFERENCES:
patent: 3852679 (1974-12-01), Schade, Jr.
patent: 3873933 (1975-03-01), Wheatley, Jr.
patent: 4045746 (1977-08-01), Wheatley, Jr.
patent: 4050030 (1977-09-01), Russell
patent: 4068182 (1978-01-01), Dingwall et al.
patent: 4138649 (1979-02-01), Schaffer
patent: 4322691 (1982-03-01), Malchow
Schaffer, "A CMOS Aid Converter Circuit for Thermocouple Temp. Measurement", 1981 ISSCC Digest, pp. 60-61.
Emanuel P. M.
Herrmann E. P.
Mottola Steven J.
Mullins James B.
RCA Corporation
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