High-energy suppression for capacitor transimpedance amplifier (CTIA)-based imagers or other imaging devices
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United States of America Patent
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Dec 12, 2023
Grant Date -
Aug 10, 2023
app pub date -
Feb 4, 2022
filing date -
Feb 4, 2022
priority date (Note) -
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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 having (i) an amplifier configured to receive the electrical current and a 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 an event detector configured to sense a high-energy event affecting the photodetector. In addition, the apparatus includes a switchable clamp coupled across inputs of the amplifier, where the event detector is configured to close the switchable clamp in response to sensing the high-energy event.
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