A precise digital phase shifter using a phase-locked loop

A precise digital phase shifter using a phase-locked loop

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A phase-locked loop containing a voltage-controlled oscillator (v.c.o.) synchronised to a harmonic of its fundamental output frequency may be used to form an attractive digital phase shifter providing low phase error with relatively simple circuitry and control requirements. Phase increments of 2π/n radians are obtained, where n is the order of harmonic used.


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