Rohde & Schwarz R&S FSH - Page 54

R&S FSH Instrument Design and Functional Description
1145.5973.82 3.3 E-11
0..30dB
Protect.
/ Att.
100 kHz
to 3 GHz
1st Mixer
2nd Mixer
3x
VCO
1st IF Amp
4031.25 MHz
B= 400 MHz
1st IF Filter
2nd IF Amp
831.25 MHz
B= 20 MHz
3rd Mixer 3rd IF Amp
loopfilter
30 kHz
VCO
2nd IF Filter
loopfilter
30 kHz
1/4
1/8
1st LO
4031.25 .. 7031.25 MHz
2nd LO
3200 MHz
3rd LO
800 MHz
800 MHz
100 MHz20 MHz
1/32
or
1/64
noise
25 MHz
3rd IF Filter
31.25 MHz
B= 2 MHz
TCXO
1/2
50 MHz
25 MHz
12
ADC
126..188 MHz
or 94..110 MHz
10 MHz
100kHz
LO1_TG
1/21/5
50 MHz
1/M
M= 2..15
Syn-
con
PDPD
:2
:1
:2
:1
REF_TG
100 MHz
(DDC, DCON)
(Spider)
Disable
1st Mixer
2nd Mixer1st IF Amp
7231.25 MHz
B= 600 MHz
1st IF Filter
x 2
x 2
6.4 GHz10.23 to 13.23 GHz
RF
Input
3 to 6 GHz
R&S FSH6 only
Fig. 3-2 Block Diagram: RF to IF Conversion and Synthesizer