Variable gain amplifier

Details Variable gain amplifier Variable gain amplifier

1991-03-01

1992-09-08

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330279, H03G 330

Patent

active

051461803

ABSTRACT:
An internal control voltage outputted from a voltage comparator controls the gain of a second amplifier. The output from the second amplifier, supplied to one input of the voltage comparator, is compared with an external control voltage supplied to the other input thereof. Such a negative feedback loop enables the gain of the second amplifier to be completely proportional to the external control voltage over the full variable gain range. The internal control voltage outputted from the voltage comparator is also inputted to a first amplifier, which includes a first variable gain portion having the same variable gain characteristic as a second variable gain portion of the second amplifier. Therefore, the gain of the first amplifier is completely proportional to the external control voltage over the full variable gain range as well as the gain of the second amplifier.

REFERENCES:
patent: 5034701 (1991-07-01), Debroux
"Bipolar and Mos Analog Integrated Circuit Design", Alan B. Grebene, pp. 458 -469.
"Analysis and Design of Analog Integrated Circuits", Paul R. Gray and Robert G. Meyer, pp. 560-571.

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