Differential amplifier with improved voltage gain using operatio

Details Differential amplifier with improved voltage gain using operatio Differential amplifier with improved voltage gain using operatio

1998-09-10

2000-02-29

Pascal, Robert

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330252, H01H 85143

Patent

active

060314249

ABSTRACT:
The present invention is a differential amplifier with circuitry to eliminate the effect of transistor impedance other than an actual load impedance on voltage gain. The circuitry includes a pair of transistors 400 and 402, each with a base connected to a respective input of the differential amplifier along with a similar base connection of a respective one of transistors 100 and 102, and an emitter connected to a current source 404. A collector of transistor 400 is connected through transistor 410 to the emitter of a current sink transistor 306, while the collector of transistor 402 is connected through transistor 412 to the emitter of a current sink transistor 308. Operational amplifiers (opamps) 420 and 422 serve as voltage followers to connect the collector of transistor 100 to the base of transistor 412, and the collector of transistor 102 to the base of transistor 410. An inverting input of the opamps 420 and 422 are connected to the emitter of transistors 410 and 412 to eliminate the effect of a emitter to base voltage drop in transistors 410 and 412. With such components, loading at the outputs V.sub.OUT and V.sub.OUTB is substantially limited to the actual load provided by transistors 306 and 308 and resistors 316 and 318.

REFERENCES:
patent: 3684973 (1972-08-01), Duck
patent: 4626795 (1986-12-01), Tanaka et al.
patent: 5144169 (1992-09-01), Hirabayashi et al.
patent: 5168243 (1992-12-01), Feliz et al.
patent: 5184086 (1993-02-01), Inohana et al.
patent: 5345237 (1994-09-01), Kouno et al.

Affiliated with

Also associated with

Rating

Differential amplifier with improved voltage gain using operatio does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Differential amplifier with improved voltage gain using operatio, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Differential amplifier with improved voltage gain using operatio will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-686634