Image sensing device having a mirroring circuit suitable for compensating an operating current
AssigneeSK hynix Inc.
InventorHyeon June Kim
Life of this patent
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Abstract
Disclosed is an image sensing device including a current supply circuit coupled between a supply terminal of a first voltage and a pair of output terminals, an input circuit coupled between the pair of output terminals and a common node, and suitable for receiving a pixel signal and a ramp signal, and a mirroring circuit coupled between the common node and a supply terminal of a second voltage, and suitable for compensating for an operating current, which flows between the common node and the supply terminal of the second voltage, based on a reference current when generating the operating current by mirroring the reference current.
Claims11
An image sensing device comprising:
- a current supply circuit coupled between a supply terminal of a first voltage and a pair of output terminals;
- an input circuit coupled between the pair of output terminals and a common node, and suitable for receiving a pixel signal and a ramp signal;
- and
- a mirroring circuit coupled between the common node and a supply terminal of a second voltage, and suitable for compensating for an operating current, which flows between the common node and the supply terminal of the second voltage, based on a reference current when generating the operating current by mirroring the reference current,
- wherein the mirroring circuit compensates for the operating current by adjusting a compensation current when the reference current is changed.
An image sensing device comprising:
- a reference current generator suitable for generating a reference current;
- a bias voltage generator suitable for generating at least one bias voltage corresponding to the reference current, and compensating for the at least one bias voltage by sensing when the reference current does not have a target level, based on the reference current;
- and
- a plurality of comparators enabled based on the at least one bias voltage, and suitable for comparing a plurality of pixel signals with a ramp signal, respectively.
Dependencies are inferred from the claim text.