US 12,278,645 B2
High resolution VCO-based ADC
Jiannan Huang, La Jolla, CA (US); and Patrick P. Mercier, La Jolla, CA (US)
Assigned to The Regents of the University of California, Oakland, CA (US)
Appl. No. 17/924,180
Filed by The Regents of the University of California, Oakland, CA (US)
PCT Filed May 27, 2021, PCT No. PCT/US2021/034514
§ 371(c)(1), (2) Date Nov. 9, 2022,
PCT Pub. No. WO2021/243019, PCT Pub. Date Dec. 2, 2021.
Claims priority of provisional application 63/031,652, filed on May 29, 2020.
Prior Publication US 2023/0179211 A1, Jun. 8, 2023
Int. Cl. H03M 1/06 (2006.01); H03M 1/08 (2006.01); H03M 3/00 (2006.01)
CPC H03M 1/0604 (2013.01) [H03M 1/0836 (2013.01); H03M 1/0854 (2013.01); H03M 3/00 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An analog to digital conversion (ADC) circuit comprising:
a voltage-controlled oscillator (VCO)-based quantizer that receives a voltage input signal to be quantized and provides a digital output;
a predictor that samples the digital output, evaluates correlation between successive samples, and predicts a predicted quantization error correction from the correlation to minimize voltage-to-frequency transfer of the VCO;
a feedback loop L1 with a digital to analog converter (DAC) receiving the predicted quantization error correction, converting it and adding it to the voltage input signal; and
a feedback loop L2 to add the predicted quantization error to the digital output.