Ramp signal generator, image sensor, and auto-zero level control method for ramp signals
AssigneeSamsung Electronics Co., Ltd.
InventorsDongjae HAN, Jaejung PARK, Seunghyun LIM, Haneul JUNG
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Abstract
A ramp signal generator may include a current cell unit including a plurality of current sources configured to generate current signals, and a resistance unit connected to an output terminal of the current cell unit. The resistance unit may include a load resistor and an offset resistor connected in series with the load resistor and having a resistance based on analog gains.
Claims12
A ramp signal generator comprising:
- a current cell unit comprising a plurality of current sources configured to generate current signals;
- and
- a resistance unit connected to an output terminal of the current cell unit,
- wherein the resistance unit comprises:
- a load resistor;
- and
- an offset resistor connected in series to the load resistor and having a resistance based on analog gains.
A method for controlling a first auto-zero level of a first ramp signal based on a first gain and a second auto-zero level of a second ramp signal based on a second gain lower than the first gain to adjust the first auto-zero level of the first ramp signal and the second auto-zero level of the second ramp signal to be equal to each other, the method comprising:
- performing primary matching on the first ramp signal to match a level of the first ramp signal to a highest level of the second ramp signal;
- and
- performing secondary matching on the second ramp signal to match the second auto-zero level of the second ramp signal to an auto-zero level of the primarily-matched first ramp signal.
Dependencies are inferred from the claim text.