(Preliminary)

Analog Frequency Multiplier

PL560/565-08 VCXO Family

AFM Phase Noise at 491.52MHz, using 122.88MHz crystal

AFM Spectrum at 491.52MHz, using 122.88MHz crystal

The analog frequency multiplication preserves the low phase noise of the quartz crystal oscillator while keeping

unwanted sub harmonics from the multiplication at very low levels. Sub harmonics appear only at large distance

from the carrier, far outside the loop bandwidth of a PLL that uses the AFM signal to multiply up further to a

multiple GHz network clock. This means the impact of the sub harmonics on the application is negligible.