US 11,659,297 B2
Image sensor with charge pump cell quantity control
Chao Yang, San Diego, CA (US); Dazhi Wei, San Diego, CA (US); and Mohamed Elsayed, San Diego, CA (US)
Assigned to SHENZHEN GOODIX TECHNOLOGY CO., LTD., Shenzhen (CN)
Filed by SHENZHEN GOODIX TECHNOLOGY CO., LTD., Shenzhen OT (CN)
Filed on Oct. 27, 2020, as Appl. No. 17/81,927.
Prior Publication US 2022/0132060 A1, Apr. 28, 2022
Int. Cl. H04N 25/709 (2023.01); H02M 3/07 (2006.01); H03M 1/12 (2006.01); H04N 25/75 (2023.01)
CPC H04N 25/709 (2023.01) [H02M 3/07 (2013.01); H03M 1/12 (2013.01); H04N 25/75 (2023.01)] 18 Claims
OG exemplary drawing
 
1. An image sensor, comprising:
a plurality of image sensor cells, each configured to generate or not generate an image signal in response to one or more control signals;
a first driver configured to generate a first control signal, wherein the first driver comprises a first positive supply terminal connected to a first power supply node; and
a voltage generator configured to generate a first voltage at the first power supply node, wherein the voltage generator comprises:
a plurality of charge pump cells, each configured to selectably source charge to the first power supply node in response to one of a plurality of enable signals, and
a charge pump cell quantity controller circuit configured to determine a number of the charge pump cells to source charge to the first power supply node based on a difference between a first voltage at an output node of the charge pump cells and a reference voltage, and to generate the enable signals based on the determined number of the charge pump cells, wherein each enable signal is either in an active state or in an inactive state,
wherein each charge pump cell is configured to source charge to the first power supply node in response to receiving an enable signal in an active state.