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 (JP)
OHSAKA ICHIRO (JP)
OHSAKA ICHIRO (JP)
Application Number:
PCT/JP2014/052389
Publication Date:
March 19, 2015
Filing Date:
February 03, 2014
Export Citation:
Assignee:
HITACHI AUTOMOTIVE SYSTEMS LTD (JP)
International Classes:
H03K4/06; G01C19/5776; H03K3/0231
Foreign References:
| JP2013528981A | 2013-07-11 | |||
| JP2011087064A | 2011-04-28 |
Attorney, Agent or Firm:
INOUE Manabu et al. (JP)
Manabu Inoue (JP)
Manabu Inoue (JP)
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