Pyroelectric detector circuits and devices
A radiation detector circuit is described, 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 the radiation input or progressive changes in radiation input of low magnitude, at least one ultra-low leakage non-linear device is connected in the part of the circuit 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 another embodiment the non-linear device is incorporated in a feedback path between the output side of an amplification stage and the detector element.
- Assignee:
- U S Philips Corp
- Patent Number(s):
- US 4198564
- OSTI ID:
- 5585313
- Country of Publication:
- United States
- Language:
- English
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