Source High Band Operation - Agilent Technologies 8752C Service Manual

Source High Band Operation

A signal (HI OUT) is generated by the fractional-N VCO.
A comb of harmonics (1st LO) is produced in the A7 pulse generator.
The A3 source is pretuned. The source output is fed to the A4 R
sample/mixer.
The synthesizer signal and the source signal are combined by the
sampler. A di erence frequency is generated.
The di erence frequency (1st IF) from the A4 R sampler is compared to
a reference.
Theory of Operation 12-19