Data recording and reproducing apparatus and phase locked loop c

Details Data recording and reproducing apparatus and phase locked loop c Data recording and reproducing apparatus and phase locked loop c

1995-08-10

1999-02-02

Huber, Paul W.

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Data clocking

327157, 331 16, 331 17, 375376, G11B 509

Patent

active

058673334

ABSTRACT:
A magnetic recording and reproducing apparatus such as a disk drive has a phase locked loop circuit which is less susceptible to an effect of noise of a power supply and ground and reduces a clock jitter. The magnetic recording and reproducing apparatus is compatible to a constant density recording system without increasing a circuit scale and a power consumption and with a small number of IC pins. The phase locked loop circuit of the magnetic recording and reproducing apparatus is provided with two D/A converter circuits to drive a loop filter. It is also provided with a circuit for distributing a reference potential of a voltage controlled oscillator (VCO) and a center frequency of the VCO, a gain of the VCO and a current gain of the D/A converter circuit are changed in linked relation. A reference voltage source is provided such that a center point or one end of the loop filter is connected to the reference voltage eliminating the ground connection.

REFERENCES:
patent: 4987387 (1991-01-01), Kennedy et al.
patent: 5157354 (1992-10-01), Saiki et al.
patent: 5382922 (1995-01-01), Gersbach et al.
patent: 5384671 (1995-01-01), Fisher
patent: 5436938 (1995-07-01), Pigeon
patent: 5459757 (1995-10-01), Minuhin et al.
patent: 5475326 (1995-12-01), Masuda
Petersen et al, "A 3-5.5 V CMOS 32 Mb/s Fully Integrated Read Channel for Disk Drives" IEEE 1993 Custom IC Conference, 10.2.1-10.2.4.

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