Radiant energy – Invisible radiant energy responsive electric signalling – Including a radiant energy responsive gas discharge device
Patent
1977-11-02
1981-09-08
Willis, Davis L.
Radiant energy
Invisible radiant energy responsive electric signalling
Including a radiant energy responsive gas discharge device
307200B, 330207P, 361 43, G01T 118
Patent
active
042886945
ABSTRACT:
Disclosed is a means for reducing leakage current associated with a path used to couple a high impedance sensor to a detector as, for example, in coupling a smoke-sensitive ionization chamber to an integrated circuit smoke detector chip. A unity gain amplifier is provided which receives a detection voltage signal from the sensor and generates an output guard voltage which tracks the detection voltage signal. The output guard voltage is used to bias the voltage of the areas surrounding the path used to conduct the detection voltage signal. The effect of undesirable leakage paths that may exist between the detection voltage signal conduction path and surrounding areas is reduced by minimizing the voltage across the leakage paths, thus maintaining a high impedance value associated with the detector input.
REFERENCES:
patent: 4091430 (1978-05-01), Berard
patent: 4115790 (1978-09-01), Tsunefuji
"New Design Techniques for FET OP Amps", published in National Semiconductor Application note AN-63 (Mar. 1972).
Ingrassia Vincent B.
Motorola Inc.
Willis Davis L.
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