AGC amplifier circuit using triple-tail cell

Details AGC amplifier circuit using triple-tail cell AGC amplifier circuit using triple-tail cell

1996-04-08

1998-05-05

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330253, 330279, H03F 345, H03G 330

Patent

active

057480419

ABSTRACT:
At AGC amplifier circuit having a triple-tail cell including first, second and, third transistors whose emitter or sources are coupled together. The first and second transistors form a differential transistor-pair. The first, second and third transistors are driven by a single tail current. Bases or gates of the first and second transistors form input ends of the triple-tail cell to be applied with an input signal to be amplified. Collectors or drains of the first and second transistors form output ends of the triple-tail cell from which an amplified output signal with a variable gain is derived. A collector or drain of the third transistor form an output end of the triple-tail cell from which a rectified output signal is derived. A base or gate of the third transistor forms an input end of the first triple-tail cell to be applied with a gain control signal. The gain control signal is produced by using the rectified output signal and is negatively fed back to the differential transistor-pair, thereby making automatic gain control. The triple-tail cell serves as a variable gain cell and a full-wave rectifier.

REFERENCES:
patent: 4293822 (1981-10-01), McFadyen
patent: 4621238 (1986-11-01), Fenk
patent: 5481224 (1996-01-01), Kimura
patent: 5485119 (1996-01-01), Kimura
patent: 5500623 (1996-03-01), Kimura
patent: 5512855 (1996-04-01), Kimura
patent: 5521542 (1996-05-01), Kimura
patent: 5561392 (1996-10-01), Kimura
patent: 5578965 (1996-11-01), Kimura
patent: 5581211 (1996-12-01), Kimura

Affiliated with

Also associated with

Rating

AGC amplifier circuit using triple-tail cell does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with AGC amplifier circuit using triple-tail cell, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and AGC amplifier circuit using triple-tail cell will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-58401