PL560-08_12 Datasheet, PDF (3/12 Pages) Micrel Semiconductor – Analog Frequency Multiplier

(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.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel [phone] • fax [phone] • www.micrel.com Rev 6/22/11 Page 3