PL565-68 Datasheet, PDF (3/12 Pages) Micrel Semiconductor – Analog Frequency Multiplier

(Preliminary) Analog Frequency Multiplier
PL565-68 VCXO
AFM Phase Noise at 311.04MHz, using 155.52MHz crystal
AFM Spectrum at 311.04MHz, using 155.52MHz 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 that 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 12/08/11 Page 3