Pyroelectric detector circuits and devices

Details Pyroelectric detector circuits and devices Pyroelectric detector circuits and devices

G - Physics

01

J

340/155

G01J 5/08 (2006.01) G01J 5/34 (2006.01) H01L 37/02 (2006.01)

Patent

CA 1114066

ABSTRACT OF THE DISCLOSURE A radiation detector circuit including a pyroelectric detector element and field effect transistor amplifier means. In order to inhibit saturation of the amplifier means under conditions of large transients in radiation input or progressive changes in radiation input of low magnitude at least one ultra- low leakage non-linear device is connected in the circuit part including the gate electrode of the amplifier means and the detector element. In one embodiment a pair of picoampere diodes are reverse parallel connected across the detector element and the circuit is formed as a hybrid microcircuit device having three external terminal connections. In other embodiments there is provision for the non-linear device to be incorporated in a feedback path between the output side of an amplification stage and the detector element.

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