Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1992-08-13
1994-02-08
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330282, 330284, H03G 330
Patent
active
052851699
ABSTRACT:
The present invention is a monolithic integrated differential amplifier having an operational amplifier and a digitally controlled means for setting the gain of said differential amplifier wherein the gain is adjustable by means of a resistive feedback network formed by a resistor chain whose taps are coupled via a multiplexer to the operational amplifier. The operational amplifier in the present invention is designated as an adaptive amplifier because its gain-bandwidth product is digitally adjustable in steps, with the respective gain-bandwidth product selected being adapted to the gain setting of the monolithic integrated differential amplifier.
REFERENCES:
patent: 4064506 (1977-12-01), Cartwright, Jr.
patent: 4739281 (1988-04-01), Doyle
Flexible PGA Designs Require Few Components; Akavia Kaniel, Intech, Inc.; 2119 E.D.N. Electrical Design News; 32 (1987) Jan. 22, No. 2, Newton, Mass., USA; pp. 181-183 186-187.
A Programmable Gain/Loss Circuit; Joseph N. Babanezhad, Member, IEEE, and Roubik Gregorian, Senior Member, IEEE; IEEE Journal of Solid-State Circuits, vol. SC-22, No. 6, Dec. 1987; pp. 1082-1089.
Deutsche ITT Industries GmbH
Mullins James B.
Peterson Thomas L.
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