Differential amplifier and comparator using the same

Details Differential amplifier and comparator using the same Differential amplifier and comparator using the same

2005-12-27

2005-12-27

Nguyen, Khanh V. (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including differential amplifier

C330S260000

Reexamination Certificate

active

06980050

ABSTRACT:
A differential amplifier. A differential pair constructed by a first transistor and the second transistor receives differential input signals. The gate terminals of a third and fourth transistor are coupled to the source terminals of the fourth transistor and the third transistor respectively, and the third and fourth transistor construct a feedback device. This feedback device provides a positive feedback to the differential pair in the differential mode, thereby increasing AC amplitude of the differential amplifier. Further this feedback device substantially brings the drain currents of the first current path and the second current path into coincidence in the Vcom mode.

REFERENCES:
patent: 5532644 (1996-07-01), Nakagawara
patent: 5912587 (1999-06-01), Mihailovits et al.
patent: 6031424 (2000-02-01), Fairgrieve
patent: 6084470 (2000-07-01), Shiramatsu et al.

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