Amplifiers – Sum and difference amplifiers
Patent
1986-02-27
1987-12-01
Mullins, James B.
Amplifiers
Sum and difference amplifiers
307568, 328127, 330 86, 330107, 330284, 330294, H03F 134
Patent
active
047107260
ABSTRACT:
A circuit useful as a voltage tunable resistive element comprises four matched MOS transistors in which each of the first and second have their drains interconnected to a first input terminal and each of the third and fourth have their drains interconnected to a second input terminal, the first and third have their sources interconnected to a first output terminal and the second and fourth have their sources interconnected to a second output terminal, and the first and fourth have their gates interconnected to a first control terminal and the second and third have their gates interconnected to a second control terminal. A continuous-time integrator is described which includes such a resistive element.
REFERENCES:
patent: 3757240 (1973-09-01), Fogg
patent: 4121183 (1978-10-01), Murphy
patent: 4275357 (1981-06-01), Nakayama et al.
patent: 4509019 (1985-04-01), Banu et al.
patent: 4523153 (1985-06-01), Itoh
patent: 4559498 (1985-12-01), Sokoloff
Columbia University in the City of New York
Mullins James B.
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