Adjustable gain differential amplifier

Details Adjustable gain differential amplifier Adjustable gain differential amplifier

1992-04-20

1993-03-30

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330253, H03F 345, H03G 330

Patent

active

051987805

ABSTRACT:
A differential amplifier avoids gain fluctuations due to process differences and changes in temperature and allows adjustability of the gain and associated frequency characteristics to desired gain values. The amplifier comprises a pair of load transistors coupled to a pair of differential input transistors. A pair of biased current source transistors assure a constant current through the differential transistors, and a pair of bias transistors supply a constant bias to the source of the load transistors. The gain is varied by varying the voltage supplied to the gates of the two load transistors. The voltage supplied to the load transistors is varied by varying the current supplied through a second pair of bias transistors. A number of current source transistors coupled in parallel vary the voltage through the second pair of bias transistors.

REFERENCES:
patent: 3803505 (1974-04-01), Ishigaki et al.
patent: 3968453 (1976-07-01), Hongu et al.
patent: 4065725 (1977-12-01), Lillis et al.
patent: 4746875 (1988-05-01), O'Leary
"Bifet Variable Gain Amplifier", IBM Technical Disclosure Bulletin, vol. 29, No. 11, Apr. 1987, p. 4840.

Affiliated with

Also associated with

Rating

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

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1283848