Radiant energy – Invisible radiant energy responsive electric signalling – Infrared responsive
Patent
1988-05-31
1989-08-29
Howell, Janice A.
Radiant energy
Invisible radiant energy responsive electric signalling
Infrared responsive
250332, G01J 526, H01L 274
Patent
active
048620025
ABSTRACT:
The invention relates to a multiple channel readout circuit optimized for a cryogenically operated IR sensor head. The circuit is applicable to the individual channel preamplifiers of a charge injection device (CID) IR sensor. Since the thermal leakage must be minimized, the voltages on the principal current supply path to the individual preamplifiers will vary when a strong signal is present on any channel. Crosstalk is avoided by using a four transistor cascode preamplifier circuit having a source follower output, in which the gate of the transistor, which acts as a load to the two cascoded transistors, is isolated from the drain of the load transistor, connected to a gate load node common to the other channels, and the node connected via a single connection of high thermal impedance to a terminal external to the cryogenic environment, at which filtering may be provided as needed.
REFERENCES:
patent: 4659928 (1987-04-01), Tew
patent: 4779004 (1988-10-01), Tew et al.
Ludington David N.
Wang Samuel C.
Hanig Richard
Howell Janice A.
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