US 12,425,040 B2
Area-efficient and moderate conversion time analog to digital converter (ADC)
V.M. Shivasubramaniyarajan, Bangalore (IN); Aswani Krishna Addagalla, Bangalore (IN); and Pradeep Anantula, Bangalore (IN)
Assigned to SANDISK TECHNOLOGIES, INC., Milpitas, CA (US)
Filed by SanDisk Technologies LLC, Addison, TX (US)
Filed on Jul. 18, 2023, as Appl. No. 18/354,370.
Claims priority of provisional application 63/435,679, filed on Dec. 28, 2022.
Prior Publication US 2024/0223205 A1, Jul. 4, 2024
Int. Cl. H03M 1/20 (2006.01); H03M 1/18 (2006.01); H03M 7/32 (2006.01)
CPC H03M 1/203 (2013.01) [H03M 1/182 (2013.01); H03M 7/3004 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method of converting an analog input signal to a digital representation thereof, the method comprising:
determining a resolution of the input analog signal;
determining an input analog signal range of the input analog signal based on the resolution;
splitting the input analog signal range into n+1 sub-ranges, n being a number of splits in the input analog signal range;
assigning a respective N-bit coarse digital code i to each sub-range;
identifying the input analog signal with a corresponding sub-range, the corresponding sub-range having respective digital code i; and
performing a delta-sigma operation on the input analog signal using upper and lower references of the corresponding sub-range that the input analog signal is identified with for a number of clocks L based on the resolution to produce the digital representation, wherein the delta-sigma operation includes obtaining a fine digital code j and calculating a digital code k by adding the coarse digital code i to the fine digital code j.