Amplifiers – With plural amplifier channels – Amplifying different frequencies in different channels
Patent
1993-03-17
1994-11-15
Sikes, William L.
Amplifiers
With plural amplifier channels
Amplifying different frequencies in different channels
330256, 330 69, 330149, 330151, H03F 368, H03F 385, H03F 100
Patent
active
053651898
ABSTRACT:
A composite amplifier includes a discrete active gain element with a feedback circuit that provides for low drift and low offset, but which also has low noise, short settling time and high bandwidth. This is accomplished in part by providing an attenuator in the feedback circuit and by providing a voltage source for the source of the discrete active gain element. The feedback circuit is connected between the gate and the source of the active gain element and is responsive to a change in voltage at the gate to supply a voltage of equal but opposite magnitude to the source. The source has an impedance whose Johnson noise is less than the noise of the active gain element. A differential amplifier in the feedback is constructed in multiple stages with a first stage having lower gain than a second stage.
REFERENCES:
patent: 4284965 (1981-08-01), Higashi et al.
Keithley Instruments, U.S. Price Schedule for Test Instruments and Accessories, Effective Oct. 1, 1991, Technical data, 11 pages.
Compsite amplifiers yield high speed and low offset by Jim Williams Linear Technology Corp., EDN,m Jan. 22, 1987, pp. 130-150,12 pages.
Stabilization of Wide-Band Direct-Current Amplifiers for Zero and Gain by Edwin A. Goldberg, RCA Review, Jun., 1950, pp. 296-300, 5 pages.
ITHACO product brochure, 1211 Current Preamplifier, p. 62 and 63, date not known but predates application filing date.
ITHACO product brochure, Model 1212 Current Preamplifier, IPS 159 Oct. 1989.
Abraham Fetsum
Lambert Anthony R.
Sikes William L.
The Governors of the University of Alberta Intellectual Property
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