Active quenching circuit for avalanche photodiodes

Details Active quenching circuit for avalanche photodiodes Active quenching circuit for avalanche photodiodes

1989-10-18

1990-10-16

Nelsm, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

307311, H01J 4014

Patent

active

049637274

ABSTRACT:
The quenching circuit comprises a signal comparator (CP) having a first input connected to the photodiode (SPAD) under control and a second input connected to a balancing impedance (C) equal to that of the photodiode. At the output of the comparator (CP) there is connected a signal generator (M), which generates a quenching signal (S) having a predetermined duration each time there is an imbalance between the two inputs of the comparator (CP). Circuital switching means (I1, I2, I3, I4) are provided, capable of holding the bias voltage of the photodiode normally high and of lowering it below the breakdown level following the generation and for the entire holding time of the quenching signal.

REFERENCES:
patent: 4001614 (1977-01-01), Dahlinger
patent: 4303861 (1981-12-01), Ekstrom
patent: 4389695 (1983-06-01), Carpenter, Jr.
patent: 4479052 (1984-10-01), Suzuki
patent: 4730128 (1988-03-01), Seki
patent: 4754131 (1988-06-01), Bethea et al.

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