Amplifiers – Signal feedback – Variable impedance in feedback path varied by separate...
Patent
1977-04-26
1978-10-10
Mullins, James B.
Amplifiers
Signal feedback
Variable impedance in feedback path varied by separate...
330110, H03G 320
Patent
active
041199227
ABSTRACT:
The circuit includes a signal path extending between an information signal input terminal and an information signal output terminal. A differential amplifier, having a non-inverting input and an inverting input, is included in the signal path, and a feedback path, containing electronically controlled impedance, connects the amplifier inverting input to the amplifier output. A branch path is branched off from the information signal output terminal and, in this branch path, a control voltage is derived from the information signal and fed to the electronically controllable impedance. In accordance with the invention, the information signal input terminal is connected to the non-inverting amplifier input to feed the information signal thereto. Two diodes are connected in parallel with each other, but in oppositely poled relation, across the feedback circuit, to limit the feedback voltage between the amplifier output and the amplifier inverting input. The circuit may be used in a so-called compander system, in which the control voltage is fed to a differential amplifier in the branch path having an inverting input connected, over a feedback path containing a second electronically controllable impedance to its output, and with the control voltage being fed to the second electronically controllable impedance. In this second differential amplifier, arranged in the branch path, the information signals are also supplied to the non-converting input thereof, and the feedback voltage between the output and the inverting input is limited to a given value.
REFERENCES:
patent: 3223936 (1965-12-01), Cook
patent: 3555435 (1971-01-01), Vosteen
patent: 3969680 (1976-07-01), Wermuth
patent: 4007340 (1977-02-01), Russell
Ottesen, "Digitally Controlled Amplifier Circuits", IBM Technical Disclosure Bulletin, vol. 16, No. 11, Apr. 1974, pp. 3504, 3505.
Licentia Patent-Verwaltungs-G.m.b.H
Mullins James B.
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