Variable gain amplifier circuit using variable impedance...

Details Variable gain amplifier circuit using variable impedance... Variable gain amplifier circuit using variable impedance...

2005-10-25

2005-10-25

Nguyen, John B (Department: 2819)

Amplifiers

With semiconductor amplifying device

Including gain control means

C330S086000, C341S150000

Reexamination Certificate

active

06958655

ABSTRACT:
A variable gain amplifier circuit using a variable impedance circuit, includes an input terminal, an operational amplifier, a first variable impedance connected with the input terminal and the operational amplifier, a second variable impedance connected with a reverse input terminal of the operational amplifier and an output terminal of the operational amplifier, a third variable impedance whose first end is connected with the reverse input terminal of the operational amplifier, a fourth variable impedance whose first end is connected with the input terminal and second end is connected with a second end of the third variable impedance, and a fifth variable impedance whose first end is connected with the second end of the third variable impedance and second end is connected with the output terminal of the operational amplifier, wherein the first variable impedance, the second variable impedance, and the third variable impedance are controlled in accordance with an upper bit group, and the fourth variable impedance and the fifth variable impedance are controlled in accordance with a lower bit group.

REFERENCES:
patent: 4628276 (1986-12-01), Mizutani
patent: 5233309 (1993-08-01), Spitalny et al.
patent: 5486791 (1996-01-01), Spitalny et al.
patent: 6344780 (2002-02-01), Dobashi et al.
patent: 6486711 (2002-11-01), Tsay et al.

Affiliated with

Also associated with

Rating

Variable gain amplifier circuit using variable impedance... does not yet have a rating. At this time, there are no reviews or comments for this patent.

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

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3441676