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Anritsu 683XXB User Manual

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26.84 MHz
VCXO
Digital
Synthesizer
Frequency
Synthesizer
206 - 391 MHz
VCO
Fine
Loop
Oscilator
Phase/
Frequency
Detector
100 kHz
Phase Error
Phase
Error
Phase/
Frequency
Detector
9 - 10 MHz
Phase
Error
10 MHz
A5 Fine Loop
100 kHz
9 - 10 MHz
215 -
400 MHz
21.5 - 40 MHz
Frequency
Divider
Phase/
Frequency
Detector
Coarse
Loop
Oscillator
FM
Main
Bias
Phase
Error
219.5 -
245 MHz
500 MHz
10 - 61 MHz
1 MHz
439 - 490 MHz
A4 Coarse Loop
500 MHz
10 MHz
10 MHz
Phase/
Frequency
Detector
100 MHz
Reference
Oscillator
100 MHz
A3 Reference Loop
10 MHz REF In
10 MHz
Hi-Stability
XTAL Oscillator
(Optional)
SRD
Sampler
Phase/
Frequency
Detector
219.5 - 245 MHz
A7 YIG Loop
FM
YIG Loop Error
FM In
(Front Panel or
Rear Panel)
Internal FM
(From A8 PCB)
Bias
Regulators
Sampled 2 - 20 GHz RF
P/O Switched Filter
YIG - Tuned
Oscillator
2 - 20 GHz
Modulator
Contol
Main
Coil
Drivers
Tune
(From A12 PCB)
+18VG
Divider
Control
RF Out
÷10
÷10
1 MHz
÷100
÷10
A11 FM
FM
A13 YIG Driver
x5
Phase
Error
÷2
10 MHz
FM Sweep
(From A12 PCB)
FM
COIL
DRIVER
 LPF
FM 
Sweep
1.9755 to 20 GHz
Harmonics
÷128
÷128
21.5 - 
40 MHz IF
21.5 - 40 MHz
Pulse
FUNCTIONAL
FREQUENCY
DESCRIPTION
SYNTHESIS
682XXB/683XXB MM
2-11
Figure 2-2. Block Diagram of the Frequency
Synthesis Subsystem