Feedback circuitry for charge digitizer

Details Feedback circuitry for charge digitizer Feedback circuitry for charge digitizer

1976-05-13

1977-09-06

Heyman, John S.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307311, 324 99D, 250551, 250211R, G01R 1926, H01J 3912

Patent

active

040471136

ABSTRACT:
Feedback circuitry for a charge digitizer is disclosed. The feedback circuitry includes a photo-diode coupled between the input of the integrator and the biasing voltage of the photo-diode and a pulsed light source connected to the output of the multivibrator of the digitizer. The pulsed light source is operative responsive to the output pulses of the multivibrator and will actuate the photo-diode upon each pulse to discharge the integrating capacitor. Preferably, the photo-diode is specially constructed to have a grounded guard ring separating the anode and the cathode portions of the envelope to thereby prevent unintended current flow on or through the envelope. This provides a normally open feedback circuit with current flow only during the pulsed intervals.

REFERENCES:
patent: 2869044 (1959-01-01), Horwege et al.
patent: 3011101 (1961-11-01), Boyce
patent: 3510750 (1970-05-01), Horino et al.
patent: 3566265 (1971-02-01), Reid
patent: 3660666 (1972-05-01), Hendrickson
patent: 3716849 (1973-02-01), Metcalf
patent: 3768009 (1973-10-01), Dorey et al.
patent: 3952205 (1976-04-01), Tobey et al.

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