JPS61181336U

JPS61181336U -

Info

Publication number: JPS61181336U
Application number: JP6587585U
Authority: JP
Priority date: 1985-05-02
Filing date: 1985-05-02
Publication date: 1986-11-12

Description

[Brief explanation of drawings]

第１図はこの考案の一実施例を示す構成図、第
２図はこの考案の他の実施例を示す構成図、第３
図はこの考案のさらに他の実施例を示す構成図、
第４図は従来の光検出回路を示す構成図、第５図
はＡＰＤの感度のバイアス電圧依存性を示す図で
ある。図において、１１は光検出用のＡＰＤ、１２は
高圧電源、１３〜１５は抵抗器、１６は遮光した
ＡＰＤ、１７はスイツチ、１８は可変抵抗器であ
る。なお図中同一あるいは相当部分には同一符号
を付して示してある。 Fig. 1 is a block diagram showing one embodiment of this invention, Fig. 2 is a block diagram showing another embodiment of this invention, and Fig. 3 is a block diagram showing another embodiment of this invention.
The figure is a configuration diagram showing still another embodiment of this invention.
FIG. 4 is a block diagram showing a conventional photodetection circuit, and FIG. 5 is a diagram showing the bias voltage dependence of APD sensitivity. In the figure, 11 is an APD for photodetection, 12 is a high-voltage power supply, 13 to 15 are resistors, 16 is a light-shielded APD, 17 is a switch, and 18 is a variable resistor. In the drawings, the same or corresponding parts are denoted by the same reference numerals.

Claims

[Scope of utility model registration request]

a resistor, and a light-shielded first APD (Avalanche Photo
A photodetection circuit comprising a resistor for dividing the breakdown voltage, and a second APD for photodetection to which the divided voltage is applied as a bias voltage.