Image sensor
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United States of America Patent
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Oct 31, 2017
Issued Date -
N/A
app pub date -
Jan 26, 2015
filing date -
Jan 24, 2014
priority date (Note) -
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Abstract
In an image sensor, a front-end circuit provides an output signal indicative of the amount of light in response to at least one input signal. The front-end circuit includes a transistor having a threshold voltage that affects a relationship between the output signal and the level of the detection quantity. This transistor has a biasing node via which a biasing voltage can be applied to a semiconductor region that affects the threshold voltage of the transistor. A replica of the front-end circuit receives at least one defined input signal, among which is a substitute of the detection quantity having a defined level. The replica is arranged in a control loop that controls the biasing voltage that is applied to the biasing node in the replica, so that the replica provides a defined output signal. This biasing voltage is then also applied to the biasing node in the front-end circuit.
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