Selectable pole bias line filter

Details Selectable pole bias line filter Selectable pole bias line filter

2008-09-09

2008-09-09

Le, Dinh T. (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

With specific source of supply or bias voltage

C327S553000, C327S558000, C327S552000

Reexamination Certificate

active

10923958

ABSTRACT:
A current mirror with selectable filter poles provides a selected low pass filtering function to a DC bias signal generated by the current mirror. Coupled between a first MOSFET and second MOSFET of the current mirror, a low pass filter with selectable filter poles comprises a plurality of resistor-configured MOSFETs coupled to at least one capacitor-configured MOSFET to provide one of a fast settle time and improved filtering for the current mirror in one embodiment of the invention. A first resistor-configured MOSFETs, biased by logic and bias circuitry, provides a low frequency filter pole that provides an improved filtering for the current mirror. A second resistor-configured MOSFET provides a high frequency filter pole that provides a fast charge time to meet a settle time requirement.

REFERENCES:
patent: 5528683 (1996-06-01), Tomasini et al.
patent: 5572162 (1996-11-01), Cotreau
patent: 5721484 (1998-02-01), Ngo et al.
patent: 5917368 (1999-06-01), Tan et al.
patent: 6630860 (2003-10-01), Anumula et al.

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