Frequency modulated output clock from a digital phase locked loop

Frequency modulated output clock from a digital phase locked loop

A frequency modulated output of a digital locked loop (DLL) is implemented with a Johnson Counter outputting a sample clock and a synchronized digital code at a multiple of the sample clock. The digital code drives a digital-to-analog converter to generate a frequency modulated control signal. The c...

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Bibliographische Detailangaben
Hauptverfasser: DAO CHRIS C, FALVEY PATRICK M, HERRIN SCOTT W, RODRIGUEZ THOMAS J, CAMPBELL, JR. JULES D
Format: Patent
Sprache:eng
Schlagworte:
AUTOMATIC CONTROL, STARTING, SYNCHRONISATION, OR STABILISATIONOF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
BASIC ELECTRONIC CIRCUITRY
ELECTRICITY
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Beschreibung
Zusammenfassung:A frequency modulated output of a digital locked loop (DLL) is implemented with a Johnson Counter outputting a sample clock and a synchronized digital code at a multiple of the sample clock. The digital code drives a digital-to-analog converter to generate a frequency modulated control signal. The control signal is summed with the center frequency control from the digital locked loop digital filter to provide a frequency modulated center frequency control signal to the DLL oscillator.