Feedback Direct Injection Current Readout For Infrared Charge-Coupled Devices

K. Kubo; H. Wakayama; N. Kajihara; K. Awamoto; Y. Miyamoto

doi:10.1117/12.978611

8 January 1990 Feedback Direct Injection Current Readout For Infrared Charge-Coupled Devices

K. Kubo, H. Wakayama, N. Kajihara, K. Awamoto, Y. Miyamoto

Proceedings Volume 1157, Infrared Technology XV; (1990) https://doi.org/10.1117/12.978611
Event: 33rd Annual Technical Symposium, 1989, San Diego, United States

Abstract

We are proposing current readout for infrared charge coupled devices (IRCCDs) which can operate at higher temperatures. Feedback direct injection (FDI) consists of a simple amplifier of gain, A<1, connected to a photodiode and a conventional direct injection (DI) circuit. The amplifier feeds the source voltage of an input field-effect transistor back to the photodiode, making the diode's resistance effectively 1/(1-A) times larger. This improves conventional direct injection current readout efficiency. FDI was used in a medium-wavelength IRCCD operating at a high temperature. We made a 64-element HgCdTe linear IRCCD using FDI. The device operates at 195 K with an NETD of 0.5 K.

Citation Download Citation

K. Kubo, H. Wakayama, N. Kajihara, K. Awamoto, and Y. Miyamoto "Feedback Direct Injection Current Readout For Infrared Charge-Coupled Devices", Proc. SPIE 1157, Infrared Technology XV, (8 January 1990); https://doi.org/10.1117/12.978611

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