Block Diagram For Micro Deck - Keysight N5171B EXG Service Manual

Reference
100MHz
VCXO

Flexible Reference FPGA
1-50 MHz
2
N.f
PFD
REF IN R (1-50)
2
10 MHz OUT
10
10 MHz 10 MHz
Signal
OCXO
Conditioning
X2, X5
PFD
Multiplier
Chain
DAC
OCXO_TUNE
100 MHz
Synthesizer Multipliers
First Doubler / Filter
1.5 to 3.0 GHz
1.5-1.9GHz
0.75 to 1.5 GHz
x2 1.9-2.4GHz
2.4-3.0GHz
Divider / Filter
390MHz
÷N
600MHz
0.75 to 1.5 GHz
900MHz
1500MHz
Synthesizer
Phase
Frequency
Detector
50 MHz 50 MHz
2
Loop Filter, Bandwidth
Selection & Gain
FN Loop
100
Compensation
MHz
FM
1.0 GHz
X5 X2
0.5 GHz
Shock Line
0.5 GHz 0.5 GHz
V
BIAS
Second Doubler / Filter
3.0-3.8GHz
3.0 – 6.0 GHz
0.25 to 6.0 GHz
3.8-4.8GHz
x2
Attenuator
4.8-6.0GHz
.25 to 3.0 GHz
0.25 to 1.5 GHz
2.5 – 5.0 GHz to MULTIPLIER
(Microdeck block diagram)
FM
62.5 to PFD
1-2 GHz VCO Mode A/B FM
125 MHz
 16 
1 to
2 GHz
FracN
FM
1.0 GHz
62.5 MHz
8
Loop Filter,
187.5 MHz
Bandwidth
62.5 or Selection & Gain
Diplexer
187.5 MHz Compensation
HP

LP
50
PFD Pretune
0.75 to 1.5 GHz
9kHz-3.2GHz RF Conditioning
0.25 to
3.0 GHz
Pulse
Generator
Control
P3-1 to
J3-1 on
Microdeck
block diagram
1GHz from Reference
J2004
PULSE
Modulation Mux
FM Out
EXT 1 ADC
LF OUT
LF
Function
Generator
EXT 2
ADC
AM
DAC
TRIG 1
Sweep
Trigger
Out
Interface
Imterface
TRIG 2
SWEEP
OUT
FM
Loop Filter, Bandwidth
Selection & Gain
Compensation
0.75-1.5 GHz
Pretune
Sum Loop
3.0 to 6.0 GHz
3 to 6 GHz
N x 500 +/- F
REF
3-6 GHz VCO
Low Band
Switched 250 MHz
Het Band
1.00 to 1.25 GHz 10MHz to OP AMP Band
250MHz
350MHz 350MHz
1GHz
Window
ALC_DET ALC_LOG_DET Comparator
Preamp

_
Log
x5
_
+
Loop
Integrator
J7
to J11 - ALC MICROWAVE
CONTROL BOARD
ALC_REF_PLUS_AM ALC_LOOP_INT
(Microdeck block diagram)
Feed Forward
Ref 
DAC
Temp TC Adj
Sense DAC
(Microdeck block diagram)
P3-5 to J3-5
Exp AM (Microdeck block diagram)
Log
Automatic Level Control
Linear AM
Keysight MXG-B UW Analog –
A3 RF Section
To MOD FILTER J3
J2002
(Microdeck block diagram)
9 kHz-3.2 GHz
U13
ALC Detector
9kHz to 10MHz
Window
ALC_UNLEVELED_L Comparator
ALC_MOD_I
_

Recp
Filter
+
DET_REF
ALC Detector Temp Control
J6000
from J18 -
ALC MICROWAVE
CONTROL BOARD