Amplifiers – With semiconductor amplifying device – Including differential amplifier
Reexamination Certificate
2007-02-06
2007-02-06
Nguyen, Patricia (Department: 2817)
Amplifiers
With semiconductor amplifying device
Including differential amplifier
C330S260000
Reexamination Certificate
active
11458396
ABSTRACT:
An apparatus and method for increasing a slew rate of an operational amplifier are provided. It only requires an operational amplifier, a monitoring control device, a push-pull output device, and a second input current source pair. It uses a monitoring control device controlled by the output stage to control the supplementary device and the second input current source pair in order to increase a slew rate of an operational amplifier. This operational amplifier also provides the rail-to-rail output function. In addition, because it does not require additional circuit to increase the slew rate, the chip size is smaller. With respect to the circuit structure, it is very simple and can be applied to the pre-existing operational amplifier without re-designing the operational amplifier and thus can keep the original characteristics of the operational amplifier.
REFERENCES:
patent: 4857863 (1989-08-01), Ganger et al.
patent: 6147665 (2000-11-01), Friedman
patent: 6600483 (2003-07-01), Akita et al.
patent: 6614295 (2003-09-01), Tsuchi
patent: 6734720 (2004-05-01), Imai et al.
Jianq Chyun IP Office
Nguyen Patricia
Novatek Microelectronics Corp.
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