Image sensing device and operating method thereof
AssigneeSK hynix Inc.
InventorsEun Jun Kim, Jin Seon Kim
Life of this patent
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Abstract
An image sensing device and an operating method thereof. The image sensing device includes a ramp signal generation circuit suitable for generating a ramp signal which corresponds to an analog gain, based on a main bias voltage, a cascode bias voltage and a plurality of ramp code signals, a bias voltage generation circuit suitable for generating the main bias voltage and the cascode bias voltage according to the analog gain, and a boost circuit suitable for boosting an output terminal of the cascode bias voltage according to the analog gain.
Claims22
An image sensing device comprising:
- a ramp signal generation circuit suitable for generating a ramp signal which corresponds to an analog gain, based on a main bias voltage, a cascode bias voltage and a plurality of ramp code signals;
- a bias voltage generation circuit suitable for generating the main bias voltage and the cascode bias voltage according to the analog gain;
- and
- a boost circuit suitable for boosting an output terminal of the cascode bias voltage according to the analog gain.
An image sensing device comprising:
- a first stage circuit coupled between a first voltage terminal and a second voltage terminal, and suitable for supplying a main current to an output terminal of a main bias voltage based on a bias voltage corresponding to an analog gain;
- a second stage circuit coupled between the first voltage terminal and the second voltage terminal, and suitable for supplying a cascode current to an output terminal of a cascode bias voltage based on the bias voltage;
- a third stage circuit coupled between the first voltage terminal and the second voltage terminal, and suitable for supplying a first boost current to the output terminal of the cascode bias voltage based on the bias voltage and a boost control signal;
- and
- a ramp signal generation circuit coupled between the first voltage terminal and the second voltage terminal, and suitable for generating a ramp signal, which corresponds to the analog gain, based on the main bias voltage, the cascode bias voltage, and a plurality of ramp code signals.
An operating method of an image sensing device that generates and uses a ramp signal whose slope is adjusted according to an analog gain, the operating method comprising:
- generating the ramp signal having a first slope based on main and cascode bias voltages corresponding to a first analog gain;
- changing the first analog gain to a second analog gain;
- boosting an output terminal of the cascode bias voltage during an initial period when the second analog gain is changed;
- and
- generating the ramp signal having a second slope, based on the main and cascode bias voltages corresponding to the second analog gain.
Dependencies are inferred from the claim text.