Title:
センサ閾値回路
Document Type and Number:
Japanese Patent JP4809472
Kind Code:
B2
Abstract:
There is provided a sensor threshold circuit that makes available a hysteresis width that is not dependent on the change in a threshold point. Since a bias current I B is generated by a threshold current I T and a threshold adjusting current I CONT , the threshold point is given by a coefficient A and a coefficient K and the hysteresis width |BH| is given by the coefficient K. Accordingly, when the coefficient K is determined, the hysteresis width |BH| is not dependent on the coefficient A and keeps a constant value. In addition, since the coefficient A depends on the resistance ratio, the threshold point is variable by changing a single resistor. Further, when the coefficient K is determined, the hysteresis width |BH| is also determined to be a single value with no variations in its value, no changes according to temperature, and no changes over time.
Inventors:
Yoshioka Sayaka
Application Number:
JP2009508639A
Publication Date:
November 09, 2011
Filing Date:
September 04, 2008
Export Citation:
Assignee:
Asahi Kasei Electronics Co., Ltd.
International Classes:
G01D1/18
Domestic Patent References:
| JP2001108480A | 2001-04-20 | |||
| JPH1038931A | 1998-02-13 | |||
| JPH0690143A | 1994-03-29 |
Attorney, Agent or Firm:
Tetsuya Mori
Yoshiaki Naito
Hide Tanaka Tetsu
Yoshiaki Naito
Hide Tanaka Tetsu