Tuned Receiver Mode
In tuned receiver mode, the analyzer is a synthesized, swept, narrow-band
receiver only. The external signal source must be synthesized and
reference-locked to the analyzer.
To achieve this, the analyzer’s source and phase lock circuits are completely
unused. See Figure 12-8. The fractional-N synthesizer is tuned so that one of its
harmonics
(1st
LO) down-converts the RF input to the samplers (In contrast to
external source mode, the analyzer does not phase lock at all. However, the
1st
Lo
is synthesized.)
The analyzer can function as a swept tuned receiver, similar to a spectrum
analyzer, but the samplers create spurious signals at certain frequencies, which
limit
the accuracy of such measurements
A13/14
FRACTIONAL-N
1ST LO
I
A4
(RI
I.
I-!
SAMPLER
MIXER
-5
1ST IF
sg6234d
Figure 12-8. Tuned Receiver Mode
Theory of Operation 12-26
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