Low-noise charge-injection method and apparatus for IR CCD scann

Details Low-noise charge-injection method and apparatus for IR CCD scann Low-noise charge-injection method and apparatus for IR CCD scann

1986-03-14

1987-08-04

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

357 24, H01J 4014, H01L 2978

Patent

active

046848002

ABSTRACT:
A method and circuit for reading out the detector signal current from an infrared focal plane array by converting the detector current into a precisely proportional charge packet which is injected into the channel of a charge-coupled device (CCD). In a preferred embodiment the circuit comprises a capacitive feedback transimpedance amplifier 30 (or similar infrared detector signal encoding circuit) coupled to a precision CCD charge-injection circuit 10 formed on a semiconducting substrate 12. A surface potential well 50 underneath a reservoir gate electrode 80 is filled with charge that is initially kept in place by a channel stop 14 and a potential barrier 62. When the detector signal is applied to signal gate electrode 60, the potential barrier 62 is lowered and a precisely proportional amount of charge fills a store potential well 48 underneath a store gate electorde 85. At an appropriate time the charge in the storage potential well 48 is transferred to CCD channel 90 by means of a clock pulse applied to a transfer gate electorde 100.

REFERENCES:
patent: 4360732 (1982-11-01), Chapman et al.
patent: 4369372 (1983-01-01), Yoshioka et al.
patent: 4394675 (1983-04-01), Anagnostopoulos et al.
patent: 4472638 (1984-09-01), Nishizawa et al.
patent: 4504740 (1985-03-01), Gillessen et al.
patent: 4583108 (1986-04-01), Sirieix

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