Offset adjustment for fully differential amplifiers

Details Offset adjustment for fully differential amplifiers Offset adjustment for fully differential amplifiers

1995-06-26

1998-04-07

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Amplitude control

327563, 327362, 327 89, 330253, 330261, 379399, H03F 345

Patent

active

057368856

ABSTRACT:
A circuit for providing an input offset voltage to balance a fully differential amplifier may include two field effect transistors (FETs) in parallel conductive paths for receiving a current, an amplifier current source, a resistor connecting the FETs at their drains, and a second amplifier with inputs for an offset correction voltage and for a reference voltage on which the fully differential amplifier is to be balanced and outputs for providing control inputs to the FETs. The input offset voltage for balancing the fully differential amplifier is the difference between currents in the parallel paths times the resistance of the resistor. The circuit may be used to balance a fully differential amplifier in a telephone CODEC. The correction voltage may correct the total offset from the CODEC, or the offset introduced by a sign bit integrator that provides a correction for excursions of the same polarity in the CODEC.

REFERENCES:
patent: 4072870 (1978-02-01), Davis
patent: 4308504 (1981-12-01), Ida
patent: 5142242 (1992-08-01), Schaffer
patent: 5148119 (1992-09-01), Wright et al.
patent: 5180932 (1993-01-01), Bengel
patent: 5266852 (1993-11-01), Shigenari et al.
patent: 5343163 (1994-08-01), Linder et al.
patent: 5365191 (1994-11-01), Hayashi
patent: 5436594 (1995-07-01), Pace et al.
patent: 5465070 (1995-11-01), Koyama et al.
patent: 5488321 (1996-01-01), Johnson
patent: 5528171 (1996-06-01), Doi et al.
patent: 5587674 (1996-12-01), Danstrom

Affiliated with

Also associated with

Rating

Offset adjustment for fully differential amplifiers does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Offset adjustment for fully differential amplifiers, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Offset adjustment for fully differential amplifiers will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-16365