Reference And Synthesizer Block Diagram - Keysight N8973B Service Manual

REFERENCE and SYNTHESIZER
A16 REFERENCE
A16A1 REFERENCE DAUGHTER
2400 MHz
O
X8
f
ALC
ALC
4.8 GHz HP HP
J724 J725
LP
300 MHz LP
J723
50 MHz
2
ALC
300 MHz
100 MHz
X3
O
NF 10
f
R
O
f
1 to 16
1 - 50 MHz
J704
EXT REF INPUT 10 MHz
(rear panel)
W23
block_nfab_refsynth2
NFA BLOCK DIAGRAM
4.8 GHz
X2
2400 MHz
SAW VCO
2.4 GHz Ref
HARMONIC
GEN
COMB
COMB
SER
GEN
LVDS
10 dB
MOD
+10 dBm 300 MHz LO_AIF
300 MHz
+13 dBm 100 MHz LO_SYNTH
SAW
100 MHz REF_A
+10 dBm
+13 dBm
100 MHz REF_C
10 MHz
10 MHz
10 MHz OUT_DIF
DAC
Card Cage
Connector
To A13J1
N
W5
2nd LO
(from A8)
J702 4800 MHz
2nd LO
W6
J703
2nd LO
J718
W19
CAL OUT J701
To A9
unused J726
W20
ECAL OUT J705
To A13J6
J714
EXT ECAL IN
W14
J711
to A2J300
J706
J707
W54
unused J716
to A3J14
J717
W12
J710
to A3J14
A14 LO SYNTHESIZER
J1 571 MHz to
Serial Bus
1154 MHz
FPGA FRAC-N
Symv/Int_Swp
LO CONTROLLER X2
CONTROLLER
VCO
J200
1142 MHz - 2308 MHz
1.15 - 1.95 GHz 2.30 - 2.90 GHz
1.45 - 1.82 GHz 2.90 - 3.65 GHz
1st
X2
ALC
1.82 - 2.30 GHz 3.65 - 4.60 GHz
block_hibandpath2
FOOTNOTES
(1) The Tuning Equations below show the relationship between
the A14 LO Synthesizer output and the Tuned Frequency in SA mode.
Band Tuning Equation
0 - 3.6 GHz LO Synth Output = Tuned Freq + 5.1225 GHz
3.6 - 8.4 GHz LO Synth Output = Tuned Freq + 322.5 MHz
8.4 - 13.6 GHz LO Synth Output = (Tuned Freq + 322.5 MHz)/2
13.6 - 17.1 GHz LO Synth Output = (Tuned Freq + 322.5 MHz)/2
17.1 - 26.5 GHz LO Synth Output = (Tuned Freq + 322.5 MHz)/4
REFERENCE and SYNTHESIZER
To A13J4
4.6 - 5.8 GHz
W4
5.8 - 7.3 GHz
J740
X2
3.8 - 8.7 GHz
1st LO Out
(1)
7.3 - 9.2 GHz
13 - 18 dBm
BLOCK DIAGRAM
7-19-2017