Title:
位相調整回路および位相調整方法
Document Type and Number:
Japanese Patent JP4940684
Kind Code:
B2
Abstract:
A phase adjustor circuit and a phase adjusting method are capable of preventing a phase shift amount from fluctuating even if a frequency of a transmission carrier wave of a sensor signal fluctuates. A chopping wave converter circuit converts a pulse string signal into a chopping wave. A chopping wave amplitude control circuit compares the amplitude value of the chopping wave with an amplitude reference value and outputs an adjustment signal corresponding to a difference between those values to the chopping wave converter circuit. The chopping wave converter circuit changes a slope of the chopping wave according to the adjustment signal to adjust the amplitude value of the chopping wave. As a result, a feedback group is structured, and the amplitude value of the chopping wave is maintained to a constant value according to the amplitude reference value.
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Inventors:
Shoko Ito
Nishizono Kazunori
Nishizono Kazunori
Application Number:
JP2006034150A
Publication Date:
May 30, 2012
Filing Date:
February 10, 2006
Export Citation:
Assignee:
Fujitsu Semiconductor Limited
International Classes:
H03K5/00; H03K4/06; H03K5/1532; H03K5/1534
Domestic Patent References:
| JP60194820A | ||||
| JP3175739A | ||||
| JP4168803A | ||||
| JP4267620A | ||||
| JP6350446A | ||||
| JP6244688A | ||||
| JP1031032A | ||||
| JP2004282424A |
Attorney, Agent or Firm:
Hiroto Tanaka