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Patent Searching and Data


Title:
OSCILLATION CIRCUIT, SEMICONDUCTOR INTEGRATED CIRCUIT DEVICE USING SAME, AND ROTATIONAL ANGLE DETECTION DEVICE
Document Type and Number:
WIPO Patent Application WO/2015/037252
Kind Code:
A1
Abstract:
The objective of the invention is to provide an oscillation circuit that ensures oscillation frequency precision against parameter variations, such as temperature variations, even for a relatively high frequency band. The oscillation circuit comprises: a first capacitor which is charge-driven by a current and the terminal voltage of which linearly changes in a first direction; and a second capacitor which is discharge-driven by a current in parallel with the charge-driving of the first capacitor and the terminal voltage of which linearly changes in a second direction that is opposite to the first direction. The oscillation circuit is configured to form an oscillation period on the basis of a first timing at which the terminal voltages of the first and second capacitors cross each other.

Inventors:
OKUTSU Mitsuhiko (2-1, Omika-cho 5-chome, Hitachi-sh, Ibaraki 93, 〒3191293, JP)
OHSAKA Ichiro (2520, Takaba, Hitachinaka-sh, Ibaraki 03, 〒3128503, JP)
Application Number:
JP2014/052389
Publication Date:
March 19, 2015
Filing Date:
February 03, 2014
Export Citation:
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Assignee:
HITACHI AUTOMOTIVE SYSTEMS, LTD. (2520, Takaba Hitachinaka-sh, Ibaraki 03, 〒3128503, JP)
International Classes:
H03K4/06; G01C19/5776; H03K3/0231
Foreign References:
JP2013528981A
JP2011087064A
Attorney, Agent or Firm:
INOUE Manabu et al. (6-1, Marunouchi 1-chome, Chiyoda-k, Tokyo 20, 〒1008220, JP)
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