Driver circuit for low voltage operation of a successive approxi

Details Driver circuit for low voltage operation of a successive approxi Driver circuit for low voltage operation of a successive approxi

1998-01-20

2000-02-01

Young, Brian

Coded data generation or conversion

Analog to or from digital conversion

Analog to digital conversion

341161, H03M 138

Patent

active

060208414

ABSTRACT:
A driver circuit for low voltage operation of a Successive Approximation Register (SAR) based Analog/Digital (A/D) converter is disclosed. The driver circuit has a plurality of cells wherein each cell is used for driving an individual column of a capacitor array. A switching circuit is held within each of the plurality of cells. The switching circuit is used for outputting one of a high voltage level V.sub.H or a low voltage level V.sub.L to an individual column of the capacitor array while driving no DC current. The switching circuit is comprised of a pair of fully differential pass gates. The pass gates are driven by circuitry referenced off of the supply voltage V.sub.dd of the A/D converter integrated circuit and ground. Because of this, each pass gate may operate off of any voltage within the V.sub.dd to ground range. Thus, the switching circuit allows for low voltage operation with a wider operating range.

REFERENCES:
patent: 5880691 (1999-03-01), Fossum et al.

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