Digitally controlled threshold adjustment circuit

Details Digitally controlled threshold adjustment circuit Digitally controlled threshold adjustment circuit

2007-05-08

2007-05-08

Lam, Tuan T. (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Amplitude control

C330S009000

Reexamination Certificate

active

11117767

ABSTRACT:
A threshold adjustment circuit including: a current DAC for supplying or sinking a varying current; a differential pair of thin oxide transistors coupled to the DAC and coupled together at a common source node; a power supply for providing a supply voltage having a voltage level above reliability of the thin oxide transistors; and a third transistor for maintaining voltage of the common source node above a predetermined level and to disable the threshold adjustment circuit. The bulk and source of each of the differential pair thin oxide transistors is coupled to the common source node and each of the differential pair thin oxide transistors is switched by a signal to keep each of the differential pair thin oxide transistors in saturation region.

REFERENCES:
patent: 5267270 (1993-11-01), Miyashita et al.
patent: 6194965 (2001-02-01), Kruczkowski et al.
patent: 6509777 (2003-01-01), Razavi et al.

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