Boosted tail-current circuit

Details Boosted tail-current circuit Boosted tail-current circuit

2008-04-17

2009-10-27

Choe, Henry K (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including differential amplifier

C330S254000

Reexamination Certificate

active

07609112

ABSTRACT:
A circuit includes a pair of input transistors configured as a differential pair and having input terminals configured to receive an input voltage. The circuit also includes a first current source connected to and configured to provide a first tail current to the pair of input transistors, the first tail current being a class-A current having a non-zero quiescent value. The circuit also includes a second current source connected to and configured to provide a second tail current to the pair of input transistors, the second tail current being a class-B current having a zero quiescent value and a non-zero non-quiescent value. The second current source is configured to provide the second tail current as a function of the input voltage.

REFERENCES:
patent: 4774476 (1988-09-01), Ecklund et al.
patent: 5872483 (1999-02-01), Kimura
patent: 6529075 (2003-03-01), Bruck et al.
patent: 6605996 (2003-08-01), Yu et al.
patent: 7443240 (2008-10-01), Katsunaga et al.
Harjani, Ramesh. “An Integrated Low-Voltage Class AB CMOS OTA”, IEEE JSSC (Feb. 1999) vol. 34, No. 2.

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