N8976B Rf (Low Freq) Block Diagram - Keysight N8973B Service Manual

N8976B NFA RF BLOCK DIAGRAM
(Lowband Path - Input signals < 3.6 GHz)
A9 INPUT
A10 INPUT
RF
ATTENUATOR A
ATTENUATOR B
Input
2 dB 20 dB 30 dB 10 dB
2 dB 6 dB
W10
W11
50 MHz,
25 dBm
W19
Cal Signal
J
From A16 Reference
50 MHz, 25 dBm or
4.8 GHz, 28 dBm
From A14
LO Synthesizer
block_nfab_rfmmW_low
W8
A11 LOWBAND
J4 A13 FRONT END
SWITCH
3.6 GHz - 44 GHz
J3
J9
J1
W9
Preamp
35 dBm
+30 dB
J2
9 kHz - 3.6 GHz Path
4 GHz
Mixer #1
W3
50 MHz, 35.3 dBm
Electronic Attenuator
J2
0 - 24 dB
Preamp
+20 dB
LO
DISTRIBUTION
ALIGNMENT
J4 THERMOMETER
W4
+15 dBm
J5 J3 J6
Aux LO Aux LO W20
+10 dBm +3 dBm ECAL In
A13W1
A13A1 BANDPASS FILTER
J2
A12 YTF
W7
Preselector
Mixer #3
17 to 34.5 GHz
J7
W36
1
IF OUT
322.5 MHz
34.4 to 44 GHz
21 dBm
Mixer #4
3.6 to 17.1 GHz
Mixer #2
J8
J13 EXT IF OUT
J12
2nd LO
14 GHz 4800 MHz
LPF +10 dBm
W5
J1
from A16
Reference Bd
X2
17 GHz
LPF
J10 J11
IF OUT IF IN
A13W2
IF
Out
Center: 5.1 Ghz
3 dB BW: 150 MHz
A15 FRONT END CONTROLLER
J800
W16
ATTENUATOR CONTROL
J700
W18
LOW BAND SWITCH CONTROL
J300
PRESELECTOR DRIVER CONTROL
W22
IF In
J902
Ext
IF In
BIAS
W26
TEE
J903
(Opt EXM)
+10 to
260 MHz - 400 MHz
DAC 10 mA
VCO
MIXER BIAS, AMP BIAS,
W17
PREAMP BIAS, E-ATTEN CONTROL,
SWITCH CONTROL, 1st LO POWER OPTIMIZATION,
J102
YTF TUNE RAMP
FOOTNOTES
1
IF OUT from A13 NOTE: Power levels based on these settings:
IF Path IF Freq. Mode: Spectrum Analyzer unless specified differently
10 MHz 322.5 MHz RF Calibrator 50 MHz, 25 dBm
Center Frequency 50 MHz
25 MHz 322.5 MHz
Span 0 Hz
Input Attenuation 10 dB
Preamp OFF
Auto Align OFF after initial Auto Align
Signal levels above 3 GHz include cable loss
of measuring system
J302
W37
J900
to AIF
322.5 MHz
23 dBm
J901
Burst
Trigger
DAC
LOG
DET
J1100
120 MHz
LPF
SWEEP
RAMP
J301
N8976B RF (Low Freq)
BLOCK DIAGRAM
7-19-2017