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Digital PLL filter and VCO for use in controlling a spindle motor of a mass data storage device

  • US 6,380,703 B1
  • Filed: 03/15/2001
  • Issued: 04/30/2002
  • Est. Priority Date: 03/15/2001
  • Status: Active Grant
First Claim
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1. A circuit for providing commutation control signals to a commutator for a polyphase brushless dc motor in a mass data storage device, comprising:

  • an accumulator to accumulate a digital count that is related to a phase difference between said commutation control signals and a motor bemf; and

    a digital variable frequency oscillator to generate an oscillator output signal of frequency related to said digital count to reset said accumulator after a predetermined time determined by said frequency.

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