Title:
SPINDLE MOTOR DRIVER IC
Document Type and Number:
Japanese Patent JPH05161379
Kind Code:
A
Abstract:
PURPOSE: To improve a detection accuracy in the case of detecting the number of revolutions by a rotor position detection signal.
CONSTITUTION: A waveform synthesizer circuit 11 is constituted of latches 28, 19 and 30, inverters 22, 23 and 24, and OR circuit 31 in such manner that a signal 38 with 1/3 period as compared with the period of one rotor-position transducing signal is generated by three rotor-position transducing signals. This signal 38 and a reference frequency are inputted to PLL circuit so that a drive signal is outputted.
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Inventors:
HAYASHI NORITSUGU
Application Number:
JP31911291A
Publication Date:
June 25, 1993
Filing Date:
December 03, 1991
Export Citation:
Assignee:
NEC CORP
International Classes:
H01L21/822; H01L27/04; H02P29/00; H02P29/40; (IPC1-7): H01L27/04; H02P5/00
Attorney, Agent or Firm:
Yutaro Kumagai