US 11,861,093 B1
Charge source circuit, analog-to-digital converter and OLED touch panel
Jingze Huang, Shanghai (CN)
Assigned to SILEAD INC., Shanghai (CN)
Filed by SILEAD INC., Shanghai (CN)
Filed on Dec. 29, 2022, as Appl. No. 18/148,239.
Claims priority of application No. 202210799529.9 (CN), filed on Jul. 6, 2022.
Int. Cl. G05F 1/575 (2006.01); G05F 1/59 (2006.01); H03F 3/45 (2006.01); G06F 3/041 (2006.01); G06F 3/044 (2006.01)
CPC G06F 3/0412 (2013.01) [G06F 3/0445 (2019.05)] 20 Claims
OG exemplary drawing
 
1. A charge source circuit, comprising:
a reference current generation block configured to provide a reference current;
a current minor block coupled to the reference current generation block and configured to minor the reference current; and
a charge output block coupled to the current minor block and configured to convert the mirrored current from the current mirror block into a corresponding amount of charge and output the amount of charge according to the following formula:
Qdc=Idc*t,
where Qdc is the amount of charge output from the charge output block, Idc is a current provided by the charge output block, and t is a period of time in which the charge output block provides the current, wherein the period t is divided into at least two consecutive time intervals with lengths which form a sequence with ratios equal to a power of 2, thereby enabling continuous adjustability of the amount of charge Qdc.