US 12,289,554 B2
Artifact mitigation in capacitor transimpedance amplifier (CTIA)-based imagers or other imaging devices
Bryan W. Kean, Denver, CO (US)
Assigned to Raytheon Company, Arlington, VA (US)
Filed by Raytheon Company, Waltham, MA (US)
Filed on Feb. 7, 2023, as Appl. No. 18/165,663.
Prior Publication US 2024/0267655 A1, Aug. 8, 2024
Int. Cl. H04N 25/778 (2023.01); H03F 3/08 (2006.01); H04N 25/709 (2023.01)
CPC H04N 25/778 (2023.01) [H03F 3/087 (2013.01); H04N 25/709 (2023.01)] 20 Claims
OG exemplary drawing
 
1. An apparatus comprising:
a photodetector configured to generate an electrical current based on received illumination;
a capacitor transimpedance amplifier (CTIA) unit cell comprising (i) an amplifier configured to receive the electrical current and a first reference voltage and generate a pre-integration voltage, (ii) a feedback capacitor coupled in parallel across the amplifier, (iii) a reset switch coupled in parallel across the feedback capacitor, and (iv) a coupling capacitor coupled to an output of the amplifier and configured to receive the pre-integration voltage and generate an integration voltage;
a comparator configured to compare the pre-integration voltage and a second reference voltage, wherein generation of the integration voltage is modifiable based on the comparison;
a bypass switch coupled in parallel with the coupling capacitor; and
a clamp switch configured to clamp the integration voltage to a specified voltage.