US 12,335,645 B2
Image sensor including power management unit for noise reduction using chopping operation and operation method thereof
Yongsuk Choi, Suwon-si (KR)
Assigned to SAMSUNG ELECTRONICS CO., LTD., Gyeonggi-Do (KR)
Filed by Samsung Electronics Co., Ltd., Suwon-si (KR)
Filed on Apr. 10, 2023, as Appl. No. 18/298,033.
Claims priority of application No. 10-2022-0113742 (KR), filed on Sep. 7, 2022.
Prior Publication US 2024/0080583 A1, Mar. 7, 2024
Int. Cl. H04N 25/70 (2023.01); H04N 25/709 (2023.01); H04N 25/76 (2023.01); H10F 39/00 (2025.01)
CPC H04N 25/709 (2023.01) [H04N 25/7795 (2023.01); H10F 39/802 (2025.01); H10F 39/8037 (2025.01)] 13 Claims
OG exemplary drawing
 
1. An image sensor comprising:
a pixel array including a plurality of pixel groups arranged in a plurality of rows and a plurality of columns, the plurality of pixel groups configured to convert a light into electrical signals and to generate pixel signals, and each of the plurality of pixel groups including a reset transistor, a select transistor, and a transfer transistor;
a row driver configured to generate a plurality of control signals for controlling the rows of the pixel array, and supply the plurality of control signals to the plurality of pixel groups, the plurality of control signals including a reset signal for controlling the reset transistor, a selection signal for controlling the select transistor, and a transfer signal for controlling the transfer transistor;
one or more power management devices configured to generate a power supply voltage for generating the plurality of control signals based on an input signal, and supply the power supply voltage to the row driver, each of the one or more power management devices including a first chopping circuit configured to modulate the input signal, an amplifier configured to generate an output signal based on the modulated input signal, and a second chopping circuit configured to demodulate the output signal and to modulate a noise caused by the amplifier, the power supply voltage including a reset power supply voltage for generating the reset signal, a selection power supply voltage for generating the selection signal, a first transfer power supply voltage for generating the transfer signal of a high level, and a second transfer power supply voltage for generating the transfer signal of a low level; and
a timing controller configured to generate a signal for controlling the row driver and the one or more power management devices, the timing controller configured to generate a clock signal and an inverse clock signal for controlling the first chopping circuit and the second chopping circuit.