Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1987-12-07
1989-03-14
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330257, H03F 345
Patent
active
048127817
ABSTRACT:
A differential variable gain transconductance amplifier suitable for but not limited to applications requiring operation with a power supply of less than 1.0V. The circuit is suitable for fabrication by integrated circuit technology and is composed of three major blocks: an input stage, a current summing gain control stage, and an output stage. The differential input stage is comprised of two identical voltage-to-current converters, with one used as the positive input and the other as the negative input. The current summing stage uses the principal of summation of opposite but equal currents canceling to produce attenuated gain. The output stage converts current into voltage and produces a single ended output.
REFERENCES:
patent: 3786200 (1974-01-01), Camenzind
patent: 4536888 (1985-08-01), Wilson
patent: 4555673 (1985-11-01), Huijsing
patent: 4599572 (1986-07-01), Nakayama
Brokaw, "Two Instrument ICS Sum Six Inputs", Electronics, Aug. 7, 1975, pp. 57, 98.
Fairchild A 706, A733, and A757.
Signetics NE/SE592.
Motorola Linear Integrated Circuit Data Book, Dec. 1971 MC1590G.
National Semiconductor publication Linear Applications, Feb. 1973, pp. AN15-2, AN31-9, AN31-15, AN32-5, and ANLB1-2.
RCA Application Note ICAN-6668, pp. 411-413.
Mullins James B.
Silicon General, Inc.
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