US 12,355,410 B2
Transconductance tuning in photon counting
Fridolin Michel, Au (CH)
Assigned to AMS INTERNATIONAL AG, Jona (CH)
Appl. No. 18/246,230
Filed by ams International AG, Jona (CH)
PCT Filed Aug. 27, 2021, PCT No. PCT/EP2021/073754
§ 371(c)(1), (2) Date Mar. 22, 2023,
PCT Pub. No. WO2022/069122, PCT Pub. Date Apr. 7, 2022.
Claims priority of application No. 20198990 (EP), filed on Sep. 29, 2020.
Prior Publication US 2023/0361736 A1, Nov. 9, 2023
Int. Cl. H03F 3/45 (2006.01); G01J 3/28 (2006.01); H04N 25/60 (2023.01); H04N 25/709 (2023.01)
CPC H03F 3/45475 (2013.01) [G01J 3/2823 (2013.01); H04N 25/60 (2023.01); H04N 25/709 (2023.01); G01J 2003/2826 (2013.01); H03F 2200/144 (2013.01); H03F 2200/546 (2013.01); H03F 2203/45116 (2013.01); H03F 2203/45546 (2013.01); H03F 2203/45601 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A circuit arrangement comprising:
an array of stages for photon counting current to voltage conversion, wherein each stage comprises:
a tunable operational transconductance amplifier comprising an amplifier input and an output, and
a feedback network that is connected to the amplifier input and to the output of the operational transconductance amplifier thereby forming a feedback loop of the operational transconductance amplifier, wherein
for each stage the tunable operational transconductance amplifier is configured to be supplied with a control voltage at a control input, where by changing the control voltage the transconductance of the respective operational transconductance amplifier can be tuned.