Symmetrically gain controlled differential amplifier

Amplifiers – With semiconductor amplifying device – Including differential amplifier

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

H03F 345

Patent

active

043180515

ABSTRACT:
An arrangement for symmetrically gain controlling a differential amplifier is disclosed. A control circuit including first and second similarly arranged transistors coupled between points of operating potential develops first and second control voltages of prescribed magnitude at collector outputs of the transistors. The first transistor is biased to provide the first control voltage at a fixed, prescribed level related to the gain control bias requirements of the amplifier. The second control voltage varies symmetrically with respect to the first control voltage in response to the setting of a potentiometer coupled to a bias circuit of the second transistor. The potentiometer is connected directly between points of operating potential such that the control voltages are equal for a center potentiometer setting, and the second control voltage varies symmetrically with respect to the first control voltage as the potentiometer is adjusted between minimum and maximum extremes to thereby produce symmetrical amplifier gain control. Symmetrical gain control is predictable and independent of potentiometer tolerance effects and variations of the operating potentials associated with the control circuit.

REFERENCES:
patent: 3473134 (1969-10-01), Hughes
patent: 3970948 (1976-07-01), Harwood et al.
patent: 4013972 (1977-03-01), Nishitoba et al.
patent: 4051519 (1977-09-01), Harwood
patent: 4173770 (1979-11-01), Watanabe et al.

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Symmetrically gain controlled differential amplifier does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Symmetrically gain controlled differential amplifier, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Symmetrically gain controlled differential amplifier will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-61393

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.