Amplifiers – Signal feedback – Combined with control of bias voltage of signal amplifier
Patent
1974-09-11
1977-09-13
Mullins, James B.
Amplifiers
Signal feedback
Combined with control of bias voltage of signal amplifier
330 30D, 330 35, H03F 316, H03F 345
Patent
active
040485757
ABSTRACT:
A family of operational amplifiers are described which utilize only MOSFET transistors as the active devices. These operational amplifiers exhibit an infinite input impedance and zero input offset and bias currents. The circuits are capable of operating over a wide range of DC supply voltages at extremely low DC current drain. An operational amplifier is shown which operates from a single positive DC supply voltage and which handles a wide range of input common mode voltage swings including some negative common mode voltages. Another operational amplifier is shown which operates from a combination of a single positive and a single negative supply voltage and which handles a wide range of positive and negative input common mode voltage swings.
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patent: 3870966 (1975-03-01), Dingwall
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patent: 3956708 (1976-05-01), Musa
Sherwin et al., "Fets as Constant Current Sources," EEE, Oct. 1967, pp. 82-85.
Jacobson, "Sense Amplifier," IBM Technical Disclosure Bulletin vol. 15, No. 6, Nov. 1972, pp. 1732-1733.
Farley Robert A.
Motorola Inc.
Mullins James B.
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