Doc Type: Patent Application
Abstract

A signal processing circuit for a rotation detector outputs accurate rotational information including a rotating direction of a rotor which rotates with an object. A phase difference compensation substantiating block decides whether a predetermined phase difference compensating condition is established. The condition relates to decision whether noise effects on first and second filter signals in first and second filter blocks are different from each other. When the phase difference compensating condition is established, the phase difference compensation substantiating block corrects the phase relationship between first and second phase difference compensation output signals so that the phase relationship is identical to that attained just before the phase difference compensating condition is established.


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Document History
  • Publication: Mar 5, 2009
  • Application: Sep 2, 2008
    US US 23061708 A
  • Priority: Sep 12, 2007
    JP 2007236985 A
  • Priority: Sep 3, 2007
    JP 2007228165 A

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