System and method for clamping a differential amplifier

Amplifiers – With semiconductor amplifying device – Including differential amplifier

Reexamination Certificate

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C327S309000

Reexamination Certificate

active

07368991

ABSTRACT:
System and method for limiting an output signal of a differential amplifier. A preferred embodiment comprises a limit sense amplifier configured to detect when the output exceeds a permitted limit, a common mode bias current unit configured to increase a signal gain of a common mode amplifier in the differential operational amplifier when the limit sense amplifier detects that the output exceeded the permitted limit, and an output stage bias current unit configured to fix the output at a level substantially equal to the specified limit when the limit sense amplifier detects that the output exceeded the permitted limit. The clamping is achieved by changing the operation of circuitry within the differential amplifier and results in a smoother clamping that helps to maintain stable operation.

REFERENCES:
patent: 5144171 (1992-09-01), Huard
patent: 5283484 (1994-02-01), Brehmer et al.
patent: 5721504 (1998-02-01), Sato
patent: 6304141 (2001-10-01), Kennedy et al.
patent: 6525607 (2003-02-01), Liu
patent: 6891408 (2005-05-01), Nishizono
patent: 6924702 (2005-08-01), Chen
patent: 7176731 (2007-02-01), Baez et al.

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