US 12,113,541 B2
Analog-to-digital converter
Kohji Hamaguchi, Tenri (JP); Takahiro Inoue, Tenri (JP); Takayuki Shimizu, Tenri (JP); Isamu Kawabe, Tenri (JP); and Tetsuro Ikeda, Tenri (JP)
Assigned to Sharp Semiconductor Innovation Corporation, Tenri (JP)
Filed by Sharp Semiconductor Innovation Corporation, Tenri (JP)
Filed on Nov. 16, 2022, as Appl. No. 17/988,749.
Claims priority of application No. 2021-188893 (JP), filed on Nov. 19, 2021.
Prior Publication US 2023/0163771 A1, May 25, 2023
Int. Cl. H03M 1/06 (2006.01); H03M 1/52 (2006.01)
CPC H03M 1/0604 (2013.01) [H03M 1/0641 (2013.01); H03M 1/52 (2013.01)] 9 Claims
OG exemplary drawing
 
1. An analog-to-digital convertor of an integration type, comprising:
a charging circuit having a capacitor configured to store electric charges based on an input current;
a discharging circuit configured to discharge the electric charges stored in the capacitor; and
a counting circuit configured to count a charge-discharge count of the capacitor in a first conversion period and in a second conversion period, in order to convert a current value of the input current into a digital value,
wherein the first conversion period includes a first pre-charging period and a first counting period,
the second conversion period includes a second pre-charging period and a second counting period, and
the analog-to-digital convertor further comprises a phase changing circuit configured to change a first phase of an output signal of the charging circuit in the first counting period to a second phase in the second counting period.