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Patent Searching and Data


Title:
SENSOR OUTPUT CIRCUIT
Document Type and Number:
WIPO Patent Application WO/2019/107102
Kind Code:
A1
Abstract:
Because it is not possible to limit the output current with high precision with a conventional sensor output circuit, it was difficult to reduce electric wave radiation with signal transmission using a single line signal. A sensor output circuit 1 of the present embodiment is configured from: pulse signals Vin that change according to a measured physical quantity; MOS transistors 3, 5 that perform an on-off operation according to the pulse signals Vin; a constant current source 2 that generates a constant current; a MOS transistor 4 that generates a gate voltage of a MOS transistor 7; MOS transistors 6, 8 that constitute a current mirror circuit; the MOS transistor 7 that works so as to maintain a drain voltage of the MOS transistor 8 at a constant voltage; and an output terminal 9 driven by the MOS transistors 7, 8 that are serially connected. Also, output signals from the sensor output circuit 1 are sent to a control circuit 11 via an output signal line 10. The control circuit 11 is configured from a pull up resistor 12, a capacitor 14, and an input gate circuit 13.

Inventors:
MATSUMOTO Masahiro (6-6, Marunouchi 1-chome, Chiyoda-k, Tokyo 80, 〒1008280, JP)
NAKANO Hiroshi (6-6, Marunouchi 1-chome, Chiyoda-k, Tokyo 80, 〒1008280, JP)
KOTABE Akira (2520, Takaba, Hitachinaka-sh, Ibaraki 03, 〒3128503, JP)
Application Number:
JP2018/041424
Publication Date:
June 06, 2019
Filing Date:
November 08, 2018
Export Citation:
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Assignee:
HITACHI AUTOMOTIVE SYSTEMS, LTD. (2520, Takaba Hitachinaka-sh, Ibaraki 03, 〒3128503, JP)
International Classes:
H03K19/0175; H04L25/02
Foreign References:
JPH04158629A1992-06-01
JP2014158184A2014-08-28
JP2007306042A2007-11-22
JP2006129331A2006-05-18
JP2007214605A2007-08-23
JP2005236395A2005-09-02
JPS62147815A1987-07-01
Attorney, Agent or Firm:
TODA Yuji (6-1, Marunouchi 1-chome, Chiyoda-k, Tokyo 20, 〒1008220, JP)
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