Programmable-gain amplifier

Details Programmable-gain amplifier Programmable-gain amplifier

1998-06-29

2000-04-11

Lee, Benny

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330133, H03F 345

Patent

active

06049252&

ABSTRACT:
To provide a programmable-gain amplifier in which sufficiently fine and linear gain control according to the logic levels of control signals can be realized with a simple circuit configuration, a programmable-gain amplifier includes a cascade connection of differential amplifiers (E.sub.1 to E.sub.n) and a current controller (100) for controlling a product of corresponding emitter currents supplied to each of the differential amplifiers (E.sub.1 to E.sub.n) according to the logic levels of binary control signals. The current controller (100) has a current mirror circuit in which the emitter of each bi-polar transistor (Q.sub.0 to Q.sub.n, Q.sub.c1 to Q.sub.cm) is connected to the ground through a MOS (M.sub.0 to M.sub.n, M.sub.c1 to M.sub.cm) transistor having a relative on-resistance designed to be in inverse proportion to the relative emitter size of the bi-polar transistor, so that the emitter current can be exactly controlled.

REFERENCES:
patent: 4213097 (1980-07-01), Chiu et al.
patent: 4514702 (1985-04-01), Zogg
patent: 4623933 (1986-11-01), Sato et al.
patent: 5216384 (1993-06-01), Vanhecke
patent: 5831477 (1998-11-01), Tsumura
patent: 5872475 (1999-02-01), Otaka

Affiliated with

Also associated with

Rating

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

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1179800