US 11,876,528 B2
Analog-to-digital conversion circuit
Nan Sun, Beijing (CN); Yi Zhong, Beijing (CN); and Jiaxin Liu, Beijing (CN)
Assigned to Tsinghua University, Beijing (CN)
Filed by Tsinghua University, Beijing (CN)
Filed on Oct. 28, 2021, as Appl. No. 17/513,016.
Claims priority of application No. 202011233397.0 (CN), filed on Nov. 6, 2020.
Prior Publication US 2022/0149862 A1, May 12, 2022
Int. Cl. H03M 1/00 (2006.01); H03M 1/46 (2006.01); H03M 1/12 (2006.01)
CPC H03M 1/466 (2013.01) [H03M 1/1245 (2013.01)] 28 Claims
OG exemplary drawing
 
1. An analog-to-digital conversion circuit comprising:
N sampling and conversion modules connected in parallel, configured to simultaneously sample and sequentially convert first analog signals of N channels to output second analog signals, wherein each of the sampling and conversion modules includes a plurality of sampling capacitors connected in parallel, wherein N is an integer greater than 1;
a comparator connected to the N sampling and conversion modules, configured to compare the second analog signals respectively to obtain comparison signals; and
a control module connected to the N sampling and conversion modules and the comparator, the control module configured to control the N sampling and conversion modules to output converted digital signals based on the comparison signals;
wherein each of the sampling and conversion modules further includes a conversion switch that includes a first terminal connected to the plurality of sampling capacitors and a second terminal connected to the comparator;
wherein the control module is configured to:
in a sample-and-hold phase, control the N sampling and conversion modules to simultaneously sample and hold the first analog signals of N channels; and
in an analog-to-digital conversion phase, control the conversion switches of the N sampling and conversion modules to close in turn so that the analog-to-digital conversion circuit performs analog-to-digital conversion on the first analog signals of N channels sequentially.