Differential amplifier and semiconductor device

Details Differential amplifier and semiconductor device Differential amplifier and semiconductor device

2006-04-18

2006-04-18

Nguyen, Patricia (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including differential amplifier

C330S255000, C330S257000, C330S267000

Reexamination Certificate

active

07030696

ABSTRACT:
A differential amplifier for amplifying an input signal at a constant amplification rate regardless of fluctuation in the center voltage of the input signal. The differential amplifier includes a first differential pair operated when a complementary input signal is greater than or equal to an intermediate level between power supplies. A second differential pair is operated when the complementary input signal is less than or equal to an intermediate level of the power supplies. A current synthesizing circuit synthesizes output currents of the first and second differential pairs to generate output voltage. An output current offset circuit offsets a current corresponding to the output current of one of the differential pairs based on the complementary input signal so that the output voltage becomes the output current of one of the first and second differential pairs.

REFERENCES:
patent: 4912393 (1990-03-01), Anderson et al.
patent: 5471665 (1995-11-01), Pace et al.
patent: 6121836 (2000-09-01), Vallencourt
patent: 6411162 (2002-06-01), Minamizaki et al.
patent: 2002-043871 (2002-02-01), None

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