Bias circuit for avalanche photodiode

Details Bias circuit for avalanche photodiode Bias circuit for avalanche photodiode

Category

G - Physics

Subcategory

01

Subsubcategory

J

IPC codes

G01J 1/44 (2006.01) G05F 3/18 (2006.01) G05F 3/20 (2006.01)

Type

Patent

Patent number

CA 2127647

Description

A bias circuit for applying a bias voltage to an avalanche photodiode APD2 for detecting light comprises a first diode APD1, a power supply V H connected to the first diode APD1, for applying a voltage to make the diode in breakdown between an anode and a cathode of the first diode APD1, and a constant voltage circuit V2 connected to the avalanche photodiode APD2 for detecting light, for applying a voltage difference of a breakdown voltage generated between the anode and the cathode of the first diode APD1 minus a constant voltage to the avalanche photodiode. The constant voltage is substantially independent from current flowing in the avalanche photodiode APD2 for detecting light to the avalanche photodiode.

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