Patent ID: 11895418
Assignee: SK HYNIX INC.
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H | IPC H

Claim 19:
20. The image sensing device of claim 19, wherein the subtraction circuit includes:
a fifth switch coupled between the reference circuit and a seventh node, and configured to operate based on the reference control signal;
a capacitor coupled between the seventh node and the low voltage terminal, and configured to store the reference voltage;
a second voltage-current converter coupled between the seventh node, the low voltage terminal and an eighth node, and configured to generate a storage current, which corresponds to a reference voltage stored in the capacitor, through the eighth node;
a sixth switch coupled between the eighth node and a ninth node, and configured to operate based on the boost control signal; and
a second current mirror coupled between the ninth node, the high voltage terminal and the current supplying circuit, and configured to supply a subtraction current, which corresponds to the storage current, to the current supplying circuit.