Reduced phase-jitter horizontal sweep control phase-lock-loop an

Details Reduced phase-jitter horizontal sweep control phase-lock-loop an Reduced phase-jitter horizontal sweep control phase-lock-loop an

1993-06-01

1994-08-09

Mis, David

Oscillators

Automatic frequency stabilization using a phase or frequency...

With reference oscillator or source

331 2, 331 17, 348536, H03L 706, H03L 707

Patent

active

053370236

ABSTRACT:
A horizontal sweep control synchronization circuit fixes the phase relationship between a horizontal synch pulse signal and a flyback signal by utilizing a first phase-lock-loop to fix the phase relationship between an oscillator signal, generated by the first loop, and the synch pulse signal, and a second loop to fix the phase relationship between the flyback signal and the oscillator signal. The first loop locks an edge of the synch pulse signal to the center of the oscillator signal, thereby allowing the synch pulse signal to remain locked to the oscillator signal during vertical retrace. The synchronization circuit only utilizes a single ramp forming circuit, thereby eliminating the jitter associated with multiple ramp forming circuits.

REFERENCES:
patent: 3846584 (1974-11-01), Itoh et al.
patent: 4396948 (1983-08-01), Fernsler et al.
patent: 4660080 (1987-04-01), Dietz et al.
patent: 4761587 (1988-08-01), Wharton
patent: 4891608 (1990-01-01), Ikeda
"Synchronous Deflection LSI For Multi-Sync. Display TV Receiver," Bipolar Integrated Circuits, NEC Corporation, pp. 1-20, (Jul. 1989).
"New Phase-Locked-Loops Have Advantages as Frequency to Voltage Converters (and More)," National Semiconductor Corp. Application Note, pp. 482-491, R. Pease, (no date).
"LM 1391 Phase-Locked Loop," National Semiconductor Corporation, pp. 3-34--3-39.

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