Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent
1995-09-22
1996-07-02
Westin, Edward P.
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
327512, H01J 4014
Patent
active
055324746
ABSTRACT:
An active quench circuit for interrupting the current flow in an avalanche photodiode (APD) operating in Geiger mode and for resetting the APD. The invention increases the speed of quenching and reduces the time required to bring the APD voltage back to its operating voltage above the breakdown voltage. The circuit includes a small inductor which isolates the reset circuit from the APD during the initial discharge and which provides a current pulse into the APD immediately after the end of the quenching operation to recharge the diode. The reset circuit also includes a diode assembly that increases the speed of the avalanche current pulse and that prevents the circuit from oscillating or latching under certain operating conditions. The circuit presents a low impedance to the APD during during reset, and is much less sensitive to the APD capacitance than prior art circuits.
REFERENCES:
patent: 4303861 (1981-12-01), Ekstrom
patent: 4762107 (1988-08-01), Schoneck et al.
patent: 4945227 (1990-07-01), Jones et al.
patent: 4963727 (1990-10-01), Cova
patent: 5168154 (1992-12-01), Harley
patent: 5194727 (1993-03-01), Johnson et al.
Dautet Henri P. E. G.
DesChamps Joseph D. P.
EG&G Limited
Nichols Steven L.
Westin Edward P.
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