L M K 0 3 0 0 0 C
E V A L U A T I O N B O A R D O P E R A T I N G I N S T R U C T I O N S
19
VCO Phase Noise - Narrow Loop Bandwidth
dThis plot shows the noise of the VCO at 1240 MHz using a 1 MHz Phase
Detector Frequency. An external oscillator was used for this plot, since the VCO
noise dominates, reference oscillator noise is not critical.
The loop bandwidth has been minimized so that the VCO is the dominant noise
contributor.
10 Hz – 20 MHz integrated RMS jitter = 56.9 ps (shown)
100 Hz – 20 MHz integrated RMS jitter = 25.0 ps
12 kHz – 20 MHz integrated RMS jitter = 0.304 ps (datasheet)
