Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1982-11-19
1984-07-17
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330261, 330311, H03F 345
Patent
active
044608730
ABSTRACT:
The voltage output of a differential amplifier is adjusted using an active feedback loop so that there is no direct current potential difference between the differential outputs of the differential amplifier. A potential difference at the differential output of a differential amplifier due to inherent bias or operating characteristics of the system is referred to as direct current offset voltage and the need to correct this condition may be referred to as differential output direct current offset voltage compensation. The feedback loop to accomplish this compensation consists of one or more stages of isolation and amplification driven by the output voltages of the differential amplifier and having a high input impedance to diminish loading of the amplifier outputs. A voltage peak detection system is used in order to isolate direct current voltage values from alternating current voltage values appearing at the differential amplifier output. This direct current peak detected value controls a current source which sums its output current to the current output of the differential amplifier to drive any direct current differential output to a minimum or zero value.
REFERENCES:
patent: 3444476 (1969-05-01), Leidich
patent: 3721914 (1973-03-01), Nakamura
patent: 3731215 (1973-05-01), Peil et al.
patent: 3940708 (1976-02-01), Sumi et al.
patent: 4024462 (1977-05-01), Highnote et al.
patent: 4156854 (1979-05-01), Weller
Schwarz, T. A., "Offset Compensation Circuit", Feb. 1977, IBM Technical Diclosure Bulletin, vol. 19, No. 9, pp. 3584-3585.
Erdi, George, "A Precision Trim Technique for Monolithic Analog Circuits", Dec. 1975, IEEE Journal of Solid-State Circuits, vol. SC-10, No. 6, pp. 412-416.
Control Data Corporation
Genovese J. A.
McGinnis W. J.
Mullins James B.
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