US 12,355,454 B2
System and method of extending input range of analog to digital converter
Alphons Litjes, Zijtaart (NL); and Erik Olieman, Waalre (NL)
Assigned to NXP B.V., Eindhoven (NL)
Filed by NXP B.V., Eindhoven (NL)
Filed on Jun. 2, 2023, as Appl. No. 18/205,250.
Prior Publication US 2024/0405780 A1, Dec. 5, 2024
Int. Cl. H03M 1/06 (2006.01); H03M 1/08 (2006.01); H03M 1/12 (2006.01); H03M 1/20 (2006.01); H03M 1/38 (2006.01); H03M 1/46 (2006.01); H03M 1/80 (2006.01)
CPC H03M 1/0604 (2013.01) [H03M 1/08 (2013.01); H03M 1/129 (2013.01); H03M 1/208 (2013.01); H03M 1/38 (2013.01); H03M 1/466 (2013.01); H03M 1/468 (2013.01); H03M 1/804 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An analog to digital converter, comprising:
a digital to analog converter (DAC) comprising a sample node coupled to a capacitor array that receives a digital control input;
a comparator that is coupled to compare a voltage of the sample node with a reference voltage to generate an input comparison value; and
a controller that is coupled to preset the digital control input with a preset value, to prompt the DAC to sample the input voltage onto the sample node, to reset the digital control input, and then to perform a conversion by successively adjusting the digital control input based on the input comparison value to determine a digital output.