Capacitor calibration in SAR converter

Details Capacitor calibration in SAR converter Capacitor calibration in SAR converter

2005-05-10

2005-05-10

JeanPierre, Peguy (Department: 2819)

Coded data generation or conversion

Converter calibration or testing

C341S172000

Reexamination Certificate

active

06891487

ABSTRACT:
Capacitor calibration in SAR converter. A method for calibrating a switched capacitor array in a SAR data converter is disclosed, which array includes a plurality of primary capacitors having a common node plate interfaced to a common node and a switched plate interfaced to a switch that is operable to be switched between first and second reference voltages. A comparator having an input connected to the common node and a reference input connected to a comparator reference node receives a comparator reference voltage. In a first calibration step for calibrating one of the primary capacitors, a reference capacitor is provided and then, the switched plate of the select primary capacitor is connected to the first reference voltage, the switched plate of the other capacitors and the reference capacitor are connected to the second reference voltage, and the common node and the comparator reference node are driven with a driver to dispose a first voltage thereon. In a second calibration step, the common node is allowed to float, the switched plate of the select primary capacitor is connected to the second reference voltage, the switched plate of the reference capacitor is connected to the first reference voltage, and the voltage on the common node is compared to the first voltage on the comparator reference node. A determination is then made as to whether the voltage on the common node is greater than the first voltage. A plurality of trim capacitors are provided and, if in the second calibration step, the voltage on the common node was determined to be greater than the first voltage, then one of the trim capacitors is disposed in parallel with the select one of the primary capacitors and then the first and second calibrating steps are repeated.

REFERENCES:
patent: 5852415 (1998-12-01), Cotter et al.
patent: 6011433 (2000-01-01), Nairn
patent: 6448911 (2002-09-01), Somayajula
patent: 6667707 (2003-12-01), Mueck et al.
patent: 6707403 (2004-03-01), Hurrell

Affiliated with

Also associated with

Rating

Capacitor calibration in SAR converter does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Capacitor calibration in SAR converter, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Capacitor calibration in SAR converter will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3398234