Title:
CURRENT DETECTION CIRCUIT, LIGHT RECEIVING DEVICE USING THE SAME, AND ELECTRONIC DEVICE
Document Type and Number:
WIPO Patent Application WO/2007/043532
Kind Code:
A1
Abstract:
It is possible to provide a current detection circuit capable of accurately detect
a current flowing in a light receiving device. A first transistor (Q1) is arranged
on a current path of a photo transistor (210). A first resistor (R10) is arranged
between one end of the first transistor (Q1) and a power supply line. A second transistor
(Q2) constitutes a current mirror circuit together with the first transistor
(Q1), multiplies the current flowing in the first transistor (Q1) by a predetermined
coefficient, and charges a charge capacitor (Cchg) having a fixed potential
at one end. A second resistor (R12) is arranged between one end of the second transistor
(Q2) and the power supply line.
Inventors:
YONEMARU, Masao (21, Saiin Mizosaki-Cho, Ukyo-k, Kyoto-shi Kyoto 85, 6158585, JP)
Application Number:
JP2006/320229
Publication Date:
April 19, 2007
Filing Date:
October 10, 2006
Export Citation:
Assignee:
ROHM CO., LTD. (21 Saiin Mizosaki-Cho, Ukyo-ku Kyoto-shi Kyoto, 85, 6158585, JP)
ローム株式会社 (〒85 京都府京都市右京区西院溝崎町２１ Kyoto, 6158585, JP)
ローム株式会社 (〒85 京都府京都市右京区西院溝崎町２１ Kyoto, 6158585, JP)
International Classes:
G01J1/44; G01R19/165; G03B7/16; G03B15/03; G03B15/05; H01L31/10; H04N5/238; G01J1/44; G01R19/165; G03B7/16; G03B15/03; G03B15/05; H01L31/10; H04N5/238
Attorney, Agent or Firm:
MORISHITA, Sakaki (2-11-12, Ebisu-Nishi Shibuya-ku Tokyo, 21, 1500021, JP)