Frequency Offset In-Depth Description; Frequency Hierarchy - Agilent Technologies 8719D User Manual

SYNTHESIZER
Figure 6-61. Typical 'lkst Setup for a Frequency Offset Measurement

Frequency Offset In-Depth Description

The source and receiver operate at two different frequencies in frequency offset operation.
The difference between the source and receiver frequencies is the Lo frequency that you
specify.
The two user-defined variables in frequency offset are the receiver frequency, and the offset
(LO) frequency. The source frequency is automatically set by the instrument and equals
receiver frequency IF + Lo or IF - LO.
The Receiver Frequency. You can choose a CW value or start and stop values for the receiver
frequency. The stimulus values, which appear on the analyzer display, will affect only the
receiver.
The Of&et Frequency (LO). This frequency value is the difference between the source and
receiver frequencies.
The analyzer's source locks to the receiver f the Lo frequency, regardless of
Note
the offset value you selected.
Once the source is phase-locked and sweeping, the analyzer's source frequency
is not known precisely. As the LO frequency changes, the source tracks it to
maintain the receiver start/stop or CW frequency that you requested.
Hierarchy.
Frequency
frequency. That is, the analyzer can measure either the lower or upper of the two IF mixing
products when it is in the frequency offset mode.
Frequency Ranges. Receiver frequency range
The source frequency can be greater than or less than the Lo
to 13.5 GHz
NETWORK ANALYZER
ATTENUATOR
Application and Operation Concepts