Controlled impedance amplifier

Details Controlled impedance amplifier Controlled impedance amplifier

1995-03-30

1996-12-17

Mottola, Steven

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330260, 330265, H03F 326

Patent

active

055857639

ABSTRACT:
An amplifier with controlled output impedance utilizing current and voltage feedback to set gain and output impedance is disclosed. The voltage feedback is provided by feedback resistor connected from the output to the inverting input. The current feedback is provided by feeding a current proportional to the output current directly to the inverting input of the amplifier. An error amplifier is used to maintain the proper ratio of the current feedback to the output current and to cancel the effects of the output device impedance on the overall output impedance. Two such amplifiers driven by complimentary signals form a differential amplifier with controlled output impedance. Because the output impedance is a function of the voltage feedback resistance and the current feedback ratio, it is possible to digitally control the output impedance by changing the feedback resistance and/or the current feedback ratio.

REFERENCES:
patent: 4349788 (1982-09-01), Sondermeyer
patent: 4593252 (1986-06-01), Korn
patent: 4959623 (1990-09-01), Khoury
patent: 5121080 (1992-06-01), Scott, III et al.
patent: 5157349 (1992-10-01), Babenezhad
patent: 5210506 (1993-05-01), Koch et al.
Babenezhad, Joseph N.; "A Low-Output-Impedance Fully Differential Op Amp with Large Output Swing and Continuous-Time Common-Mode Feedback", IEEE Journal of Solid-State Circuits, vol. 26, No. 12, Dec. 1991.

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