Method and apparatus for generating an eight-to-fourteen modulat

Details Method and apparatus for generating an eight-to-fourteen modulat Method and apparatus for generating an eight-to-fourteen modulat

1997-03-11

1999-07-06

Wambach, Margaret R.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

327150, 327151, 327156, H03L 706

Patent

active

059202149

ABSTRACT:
A method and phase locked loop for generating an eight-to-fourteen (EFM) data restoring clock signal. A frequency detector detects the number of clock pulses input during a pulse width of the EFM data signal, compares the detected number with predetermined maximum and minimum values, and outputs a signal indicative of the resulting comparison value. A voltage controlled oscillator varies an oscillating frequency in response to a DC control signal and outputs the clock pulses corresponding to the oscillating frequency. A programmable counter frequency-divides the clock pulses generated by the voltage controlled oscillator in response to a predetermined speed multiple and outputs the frequency-divided clock pulses. A phase detector detects a phase difference between the EFM data signal and the clock pulses generated by the programmable counter and outputs a signal indicative of the phase difference. A mixer mixes the output of the phase detector with the output of the frequency detector. A control signal generator outputs the DC control signal according to the output of the mixer. Thus, the data access speed is increased and the phase locked loop is more rapidly set into a locking range.

REFERENCES:
patent: 5594763 (1997-01-01), Nimishakavi
patent: 5661425 (1997-08-01), Minoda et al.
patent: 5818265 (1998-10-01), Meller et al.

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