Title:
PHASE SYNCHRONIZING CIRCUIT
Document Type and Number:
WIPO Patent Application WO/1992/002986
Kind Code:
A1
Abstract:
A high speed synchronization pulling-in technique of a phase synchronizing circuit which is used in magnetic disc devices. When a circuit (1) for detecting a synchronous field detects a synchronous field, a selector (2) selects read data (RD), and a circuit (46) for stopping/restarting oscillation stops the oscillation of an oscillating circuit (40) by an output (RS) of a circuit (50) for controlling the timing of the oscillation. After passing bits of several bytes, the circuit (46) restarts the oscillation of the oscillating circuit (40) by an output (RS) of the circuit (50). A circuit (60) for adjusting a pulse width causes the fall of the read data (RD) to coincide with the oscillation restart by adjusting the pulse width of its output (S¿IN?) to a delay time for restarting, and performs the high speed synchronisation pull-in.
Inventors:
OGAWA TAKAO (JP)
KAWASAKI TAKESHI (JP)
KAWASAKI TAKESHI (JP)
Application Number:
PCT/JP1991/001052
Publication Date:
February 20, 1992
Filing Date:
August 06, 1991
Export Citation:
Assignee:
SEIKO EPSON CORP (JP)
International Classes:
H03L3/00; H03L7/089; H03L7/099; H03L7/10; (IPC1-7): G11B20/14; H03L7/10
Foreign References:
| JPS5389651A | 1978-08-07 | |||
| JPS58107728A | 1983-06-27 | |||
| JPS58107729A | 1983-06-27 | |||
| JPS59140614A | 1984-08-13 |
Attorney, Agent or Firm:
Yamada, Minoru (5th Floor 1-17, Honjyo 1-chom, Matsumoto-shi Nagano-ken 390, JP)
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