US 9,813,073 B1
Sub-ranging SAR analog-to-digital converter with meta-stability detection and correction circuitry
Ronak Prakashchandra Trivedi, Bangalore (IN)
Assigned to NXP B.V., San Jose, CA (US)
Filed by NXP B.V., Eindhoven (NL)
Filed on Aug. 22, 2017, as Appl. No. 15/683,748.
Int. Cl. H03M 3/00 (2006.01); H03M 1/10 (2006.01); H03M 1/12 (2006.01); H03M 1/06 (2006.01); H03M 1/00 (2006.01); H03M 1/80 (2006.01)
CPC H03M 1/1009 (2013.01) [H03M 1/1071 (2013.01); H03M 1/00 (2013.01); H03M 1/0695 (2013.01); H03M 1/12 (2013.01); H03M 1/804 (2013.01); H03M 3/30 (2013.01)] 10 Claims
OG exemplary drawing
 
1. An article of manufacture comprising a sub-ranging analog-to-digital converter (ADC) for generating a digital output value corresponding to an analog input signal, the sub-ranging ADC comprising:
a coarse ADC that generates bit values corresponding to most-significant bits (MSBs) of the digital output value;
a fine ADC that generates bit values corresponding to least-significant bits (LSBs) of the digital output value, wherein the fine ADC generates successive analog approximation signals for the analog input signal;
meta-stability (MTS) detection circuitry that compares a current approximation signal to a previous approximation signal to detect a coarse-ADC MTS condition in the coarse ADC; and
a controller that controls operations of the sub-ranging ADC to correct for a detected coarse-ADC MTS condition.