HIGH FLUX DETECTION AND IMAGING USING CAPACITOR TRANSIMPEDANCE AMPLIFIER (CTIA)-BASED UNIT CELLS IN IMAGING DEVICES
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United States of America Patent
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Issued Date -
Aug 8, 2024
app pub date -
Feb 7, 2023
filing date -
Feb 7, 2023
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Abstract
An apparatus includes a photodetector configured to generate an electrical current based on received illumination. The apparatus also includes a capacitor transimpedance amplifier (CTIA) unit cell configured to generate an integration voltage based on the electrical current. The CTIA unit cell includes (i) an amplifier configured to receive the electrical current and a first reference voltage, (ii) a feedback capacitor coupled in parallel across the amplifier, and (iii) a reset switch coupled in parallel across the feedback capacitor. The apparatus further includes a comparator configured to compare an input voltage of the amplifier and a second reference voltage, where generation of the integration voltage is modifiable based on the comparison.
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