Time-discrete phase-locked loop

Details Time-discrete phase-locked loop Time-discrete phase-locked loop

1998-12-18

2000-08-08

Masih, Karen

Electricity: motive power systems

Positional servo systems

Frequency- or phase-modulated systems

318608, 388911, 358158, 358148, G05B 102

Patent

active

061006610

ABSTRACT:
A time-discrete phase-locked loop includes a discrete time oscillator (DTO) which supplies a periodical oscillator signal (OS) representing oscillator values (OV) at corresponding clock instants (TC) of a clock signal (CLK). A position-determining circuit (P) generates a time-discrete synchronization instant (SI) representing a position of an analog synchronizing pulse (SP) of a video signal with sub-clock period accuracy. A phase detector (PD) determines a phase error (PE) between the discrete time oscillator signal (OS) and the synchronization instant (SI) by using the synchronization instant (SI), a value (OV1) of the discrete time oscillator signal (OS) at a clock instant (TC1) related to the synchronization instant (SI), and the slope of the oscillator signal (OS). A period of the oscillator signal (OS) depends on the phase error (PE). By using the slope of the oscillator signal (OS), the phase error (PE) is independent of this slope.

REFERENCES:
patent: 4606052 (1986-08-01), Hirzel et al.
patent: 4608702 (1986-08-01), Hirzel et al.
patent: 5181115 (1993-01-01), Flamm et al.

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