Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1992-03-16
1992-11-24
Dzierzynski, Paul M.
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330149, 330260, H03F 345
Patent
active
051666375
ABSTRACT:
A distortion cancellation amplifier system operational amplifier system includes a current mirror circuit having an input, an output and a common terminal; a device for providing a pair of differential current signals to the input and output terminals of the current mirror circuit; a control device, responsive to said output terminal of the current mirror circuit, for controlling the voltage at the common terminal to drive the voltage at the input terminal of said current mirror circuit to track the voltage on the output terminal of the current mirror circuit; an output amplifier stage having a predetermined gain and having an input and an output terminal with its input terminal connected to the output terminal of the current mirror circuit; a gain control device having a predetermined impedance connected with the input terminal of the output amplifier; and a distortion suppression device connected between the output terminal of the output amplifier and the input terminal of the current mirror circuit and having an impedance equal to the predetermined impedance of the gain control device divided by the predetermined gain of the output amplifier for cancelling signal distortion introduced by the output amplifier stage.
REFERENCES:
patent: 4163948 (1979-08-01), Rieger et al.
patent: 4438349 (1984-03-01), Shoji
patent: 4462002 (1984-07-01), Schade, Jr.
patent: 4628279 (1986-12-01), Nelson
Analog Devices Inc.
Dinh Tan
Dzierzynski Paul M.
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