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Rohde & Schwarz 890 Series - Synthesizer, Block Diagram

Rohde & Schwarz 890 Series
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V L F > H F R E C E I V E R S
f
R & S E K 8 9 5 / R & S E K 8 9 6
User Manual
f
Synthesizer
Loop 2
f
2
Frequency
Information
f
1
Switchover
of Divider
Switchover
Internal/External
N = 413 to 713
VCO
Loop 4
10 MHz
F>EXT
10
5
1
10
1
TESTSIG
(100 kHz)
VCO1
4
1
1
10
z1
40 MHz
5.66 MHz
LOGIC DDS
EPROM
D
A
1st OSC
(41.44 to
71.44 MHz)
Level
Loop 1
1 MHz
10 MHz
8
1
2
1
1
625
z
875
1
25
1
10
1
z2 VCO2
1
N
Presetting
z3 VCO3
Loop 3
Presetting
CM
Loop 1 Loop 2 Loop 4 Level Loop 3
IRQCM
CM SYNTH
VV VV
f
synthesis
TCXO (mod. 02)
OCXO (mod. 03)
Fig. 1.9 Synthesizer, Block Diagram
6164.0717.02_01
> 1.17 >

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