Amplifiers, methods of increasing current gain in...

Details Amplifiers, methods of increasing current gain in... Amplifiers, methods of increasing current gain in...

2006-08-30

2009-11-24

Nguyen, Khanh V (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including differential amplifier

C330S255000, C330S257000

Reexamination Certificate

active

07622990

ABSTRACT:
An amplifier includes a differential stage including a differential pair of transistors of a first conductivity type, the differential pair having gates, first and second inputs to the amplifier respectively including the gates of the differential pair; a current sum branch coupled to the differential stage, the current sum branch including a variable current source and being configured to sum current from the variable current source with current from the differential stage that flows to the current sum branch if a voltage at the first input exceeds a voltage at the second input; and an output stage coupled to the current sum branch. An imaging device and a method of manufacturing an amplifier are also provided.

REFERENCES:
patent: 4912425 (1990-03-01), Kobayashi et al.
patent: 5854573 (1998-12-01), Chan
patent: 6100762 (2000-08-01), Kato
patent: 6605993 (2003-08-01), Suzuki
patent: 6987420 (2006-01-01), Miura
Callewaert, Ludwig, et al. “Class AB CMOS Amplifiers with High Efficiency”,IEEE Journal of Solid State Circuits, vol. 25, No. 3, pp. 684-691 (Jun. 1990).

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