US 12,321,185 B2
Low dropout regulator providing variable offset and analog to digital conversion circuit including the same
Jaehoon Lee, Suwon-si (KR); Yong Lim, Suwon-si (KR); and Seunghyun Oh, Suwon-si (KR)
Assigned to Samsung Electronics Co., Ltd., Gyeonggi-do (KR)
Filed by Samsung Electronics Co., Ltd., Suwon-si (KR)
Filed on Jan. 3, 2023, as Appl. No. 18/149,278.
Claims priority of application No. 10-2022-0002952 (KR), filed on Jan. 7, 2022; and application No. 10-2022-0111674 (KR), filed on Sep. 2, 2022.
Prior Publication US 2023/0221747 A1, Jul. 13, 2023
Int. Cl. H03M 1/38 (2006.01); G05F 1/575 (2006.01); H03M 1/46 (2006.01)
CPC G05F 1/575 (2013.01) [H03M 1/46 (2013.01)] 20 Claims
OG exemplary drawing
 
8. An analog-to-digital conversion (ADC) circuit converting an analog signal into a digital signal, the ADC circuit comprising:
a plurality of reference voltage generators configured to generate a reference voltage;
an analog-to-digital converter (ADC) configured to generate a comparative voltage by bit based on the reference voltage, and to generate a digital signal corresponding to the analog signal based on a result of comparing the comparative voltage by bit with the analog signal; and
a plurality of decoupling capacitors respectively connected to the plurality of reference voltage generators and connected to the ADC via a respective one of a plurality of switches,
wherein the reference voltage generator comprises
an operational amplifier connected to a capacitor receiving an input voltage through a first end and storing an offset voltage through a second end,
a first transistor configured to control an electrical connection between the input voltage and the first end of the operational amplifier,
a second transistor configured to control an electrical connection between the first end of the operational amplifier and a first node,
a third transistor configured to control an electrical connection between an output end of the operational amplifier and a second node, and
a fourth transistor configured to control an electrical connection between the second end of the operational amplifier and the output end of the operational amplifier.