Title: Differential amplifier

Abstract: A family of differential amplifiers are described which utilize only MOSFET transistors as the active devices. These 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. A differential 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 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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Other info:

Inventors: Hsiao, Perng (Tempe, AZ, US)
Musa, Fuad H. (Tempe, AZ, US)

Application Number: 505101
Filing Date: 1974-09-11
Publication_date: 1976-03-30
Assignee: Motorola, Inc. (Chicago, IL)
Primary Class(es): 330/253 330/257, 330/261
Other Classes:
US Patent Ref:

3569849	Mar, 1971	Cassidy	330/30.
3581226	May, 1971	Perkins	330/30.
3660773	May, 1972	Free	330/30.
3667063	May, 1972	Boyd et al.	330/30.
3852679	Dec, 1974	Schad, Jr.	330/30.

Other Refs:
Primary Examiner: Rolinec, R. V.
Assistant Examiner: Dahl, Lawrence J.
Attorney: Weiss; Harry M., Hoffman; Charles R.