Agilent Technologies 8935 Series, Manual

Page: 309 / 343

308 Chapter 10
Block Diagrams
RF Generator Section
RF Generator Section
Frequency Generation
The A2A25 Signal Generator Synthesizer ( Figure 10-17 on page 310 )
develops a 500 MHz to 1000 MHz signal which is phase-locked to the
200 kHz reference from the A2A23 Reference Assembly (
Figure 10-21
on page 315 ). An out-of-lock indicator LED lights if the phase-lock-loop
is out-of-lock. When you turn the Test Set’s power on, the LED lights for
a few seconds then goes out. If it stays on or comes on again, the loop is
out-of-lock.
The A2A44 Output Section assembly ( Figure 10-19 on page 312 )
develops the RF Generator’s 0.4 to 000 MHz frequency range by mixing,
dividing, or passing the 500 MHz to 1000 MHz from the Signal
Generator Synthesizer. The frequencies are derived as shown in
Table
10-2 .
The A2A110 Upconverter assembly ( Figure 10-20 on page 313 ) develops
the RF generator’s 1.2 to 2.0 GHz range by mixing the 800-1000 MHz
signal from the output section with a 1.5-3.0 GHz LO.
Table 10-2 IF Frequencies
Output Frequency Derivation
400 kHz - 250 MHz mix
250 MHz - 500 MHz divide
500 MHz - 1 GHz pass
1.7 GHz - 2.0 GHz mix