Phase detection reset in phase locked loops used for direct VCO

Details Phase detection reset in phase locked loops used for direct VCO Phase detection reset in phase locked loops used for direct VCO

1994-05-09

1996-05-28

Chin, Stephen

Pulse or digital communications

Synchronizers

Phase displacement, slip or jitter correction

375376, 327156, H03D 324

Patent

active

055219470

ABSTRACT:
A phase-lock loop (PLL) includes a switch for opening the loop (e.g. for direct modulation of its voltage-controlled oscillator (VCO) during transmission of an intermittent signal such as data bursts) and has a phase comparator which can be selectively initialized (e.g. by setting to a programmed value or resetting to zero or terminal count value the reference and/or feedback signal frequency dividers) so that upon "re-closing" of the loop the PLL will achieve phase-lock within a predetermined amount of time. When the loop is opened, the VCO's dc ("phase-lock") control voltage can be maintained so as to help ensure that phase-lock will be achieved within the desired amount of time.

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Shigeki Saito et al., "State-Preserving Intermittently Locked Loop (Spill) Frequency Synthesiser for Portable Radio," IEEE Transactions on Microwave Theory and Techinques, vol. 37, No. 12 (Dec. 1989), pp. 1898-1903.
Supplemental Information Disclosure Statement including four declarations and exhibits A-D which were previously filed on Sep. 19, 1994, in U.S. patent application Ser. No. 08/029,134.

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