Control circuit for operational amplifier and method thereof

Details Control circuit for operational amplifier and method thereof Control circuit for operational amplifier and method thereof

2005-09-21

2008-03-11

Nguyen, Patricia (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including differential amplifier

C330S257000, C330S010000

Reexamination Certificate

active

07342452

ABSTRACT:
A control circuit for an operational amplifier and a method thereof are provided to dynamically modulate the operational amplifier for strong driving capability and power saving. The control circuit comprises a bias unit coupled to the operational amplifier and a control unit coupled to the bias unit. The bias unit normally outputs a bias signal to bias the operational amplifier so that the operational amplifier has a first driving capability. However, when the driving capability of the operational amplifier needs to be adjusted, the control unit receives a modulating signal and outputs a control signal according to the modulating signal. When the bias unit receives the control signal, the bias unit dynamically modulates the bias signal according to the control signal, and hence the driving capability of the operational amplifier is dynamically modulated in an indirect manner.

REFERENCES:
patent: 3848195 (1974-11-01), Kiko
patent: 5675288 (1997-10-01), Peyrotte et al.
patent: 6614309 (2003-09-01), Pehlke
patent: 6753735 (2004-06-01), Arai et al.
patent: 7072626 (2006-07-01), Hadjichristos
patent: 7170352 (2007-01-01), Caldwell

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