Invention Grant
US07880126B2 Current detection circuit, light receiving device using the same, and electronic device
失效
电流检测电路，使用其的光接收装置和电子装置
- Patent Title: Current detection circuit, light receiving device using the same, and electronic device
- Patent Title (中): 电流检测电路，使用其的光接收装置和电子装置
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Application No.: US12089784Application Date: 2006-10-10
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Publication No.: US07880126B2Publication Date: 2011-02-01
- Inventor: Masao Yonemaru
- Applicant: Masao Yonemaru
- Applicant Address: JP
- Assignee: Rohm Co., Ltd.
- Current Assignee: Rohm Co., Ltd.
- Current Assignee Address: JP
- Agency: Cantor Colburn LLP
- Priority: JP2005-296723 20051011
- International Application: PCT/JP2006/320229 WO 20061010
- International Announcement: WO2007/043532 WO 20070419
- Main IPC: H01J40/00
- IPC: H01J40/00
Abstract:
A first transistor is provided on a current path for a phototransistor. A first resistor is provided between one terminal of the first transistor and the power supply line. A second transistor forms a current mirror circuit in cooperation with the first transistor, which amplifies with a predetermined amplification factor the current that flows through the first transistor. A charge capacitor, one terminal of which is connected to a fixed electric potential, is charged with the current thus amplified. A second resistor is provided between one terminal of the second transistor and the power supply line.
Public/Granted literature
- US20090278028A1 CURRENT DETECTION CIRCUIT, LIGHT RECEIVING DEVICE USING THE SAME, AND ELECTRONIC DEVICE Public/Granted day:2009-11-12
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