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L M X 2 5 3 1 L Q 1 7 0 0 E
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
Phase Noise with Narrow Loop Filter (Internal Divide by 2 Disabled)
The plots to the left show the true
phase noise capability of the
VCO. In order to take these plots,
a 20 Hz loop bandwidth was used
with
the
E5052
spectrum
analyzer.
This is the most
accurate and state of the art
equipment.
A
t
lower
offsets,
the
measurements are more accurate
because the impact of the PLL is
removed. At higher offsets, the
measurements are also more
accurate because the E5052
spectrum analyzer has a much
lower noise floor than the E4445A
spectrum analyzer. Even though
the
E4445A
has
a
noise
cancellation
feature,
it
only
cancels out thermal noise and not
cancel out the phase noise if the
LO inside this equipment.
5
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