U.S. Philips Corporation

Hans J Kunz

Johannes S Vromans

Johannes H A Brekelmans

A receiver having a phase-locked loop (PLL) for synchronizing its oscillator with a carrier (CA). A calibration circuit (CAL) calibrates the phase-locked loop's oscillator (OSC) in the following manner. It measures (FMC) the frequency difference (dF) between a nominal frequency (Fnom) of the carrier (CA) and a frequency (Fosc) of the phase-locked loop's oscillator (OSC). Furthermore, it adjusts the frequency (Fosc) of the PLL oscillator in accordance with the measured frequency difference (dF). As a result, the phase-locked loop's oscillator will be substantially tuned to the nominal frequency of the carrier. The actual frequency of the carrier may differ from the nominal frequency. In general, such a difference will be sufficiently small for the phase-locked loop (PLL) to capture the carrier (CA).

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Buchholz, Germany

Hans J Kunz