Amplifier with controlled output impedance

Details Amplifier with controlled output impedance Amplifier with controlled output impedance

1990-12-21

1992-06-09

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330 85, 330293, H03F 134

Patent

active

051210800

ABSTRACT:
An amplifier with controlled output impedance has a first output connected to the inverting input of the amplifier, and a second output, which forms the output of the amplifier, connected through a feedback conductance to the inverting input of the amplifier. A input conductance is connected from the inverting input to ground, and the input signal is connected to the positive input of the amplifier. The first and second outputs are provided by first and second current output stages. The currents provided by the first and second output stages are proportional to each other by a predetermined ratio. By proper selection of this predetermined ratio and the feedback and input conductances the desired output impedance and overall gain of the amplifier into a given load can be achieved.

REFERENCES:
patent: 4349788 (1982-09-01), Sondermeyer
patent: 4593252 (1986-06-01), Korn
"Amp Skirts Impedance-Matching Losses, Cuts Distortion From DC to 200 MHz," Electronic Design, Mar. 8, 1990, p. 29.

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