dg8saq vnwa tutorial - sdr-kits
TRANSCRIPT
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DG8SAQ VNWA TutorialDG8SAQ VNWA Tutorial
Experiments with the DG8SAQ VNWA and the SDR Kits Test Boardand the SDR-Kits Test Board
Tom BAIERTom BAIER
DG8SAQ
This is an excerpt from my Ham Radio 2013 presentation which has been slightly extended (slides 6 20 and 21 added)been slightly extended (slides 6, 20 and 21 added).
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Test Board for HF ExperimentsTest Board for HF Experiments
Calibration ShCalibrationStandards:
Short:
Load = 47Ω:Load = 47Ω:
ThOhttp://www.sdr-kits.net/ 2
Thru:Open = n.c.
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Measuring „Load“-Resistor without SOL-Calibration?
Works, becauseVNWA TX and RXVNWA TX and RX port impedancesare exactly 50 Ωare exactly 50 Ω.
only Thru only Thrucalibrationrequired!
Zx = 47 Ω yield ≈3,4 dBinsertion loss
required!
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insertion loss.
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Measuring „Load“-Resistor in Transmission (=S21-Measurement)
Only Thru calibrationrequired
Measurement: Resistor betweenrequired Resistor betweenTX and RX
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Measuring „Load“-ResistorResult = 46,6 Ω
n tam
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http://www.sdr-kits.net/ 5Analysis with Custom Trace Con
data
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Reflection Data vs Transmission DataReflection Data vs. Transmission Data
normalizednormalizedimpedance:
! Z!
50xZz50
21 112 ( )S s t S11
11
zS
212
2S
21 112 ( )S s t S
1z 21 2z 11 212 ( )S t s S
http://www.sdr-kits.net/ 6These conversions can be performed with VNWA Custom traces.
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Simple Calibration Standard Model:Only measured Load-Resistance
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SOL-Calibration for S11-MeasurementSOL Calibration for S11 Measurement
TX
Short Open Loadp
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Reflexion Measurement (S11) of a1 nF Capacitor
|S |
C
|S11|
Resonancedue toESR l
capacitivedue tocomponentwires
ESR = loss
wires
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Capacitor reflects almost total power, |S11| ≈ 0 dB
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Modelling of Measurement Result in VNWA using Custom-Trace
I d t R fl i ffi i tImpedance to Reflecion coefficient
0,984 nF 9,3 nH 0,22 Ω
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, , ,
einfaches Modell
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The Model is quite accurate!The Model is quite accurate!
ktiv
e !
Indu
k
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Two Port Measurement of a 12 kHz Band Pass Filter
• S-Parameters applicable to lowfrequencies as wellfrequencies as well.
• The VNWA too!
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Special VNWA Settings for low FrequenciesSpecial VNWA Settings for low Frequencies
Lowest sample rate 300 Hz→ Nyquist limit 150 Hz
IF must be within Codec frequency range→ Nyquist limit 150 Hz
→ Measurements down to≈150 Hz possible
frequency range(20 Hz…16kHz)
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≈150 Hz possible
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SOLT-Calibration for 2-Port MeasurementsSOLT Calibration for 2 Port Measurements
TX TX RX
Short Open Load Thru
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Beware: Steep Skirt Filters require Time tosettle to changing Stimulus!
5 s sweep time
0,3 s sweep time
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Two Port Measurement of a 12 kHz Band Pass Filter
We need to measure all four S-parameters(S11, S21, S12, S22) …http://www.sdr-kits.net/ 16
(S11, S21, S12, S22) …
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Two Port Measurement of a 12 kHz Band Pass Filter: Forward Measurement
TX
1
2
RXhttp://www.sdr-kits.net/ 17
RXS11, S21 measured
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Two Port Measurement of a 12 kHz Band Pass Filter: Reverse Measurement
TXTX
2
1
RXhttp://www.sdr-kits.net/ 18
RXS12, S22 measured
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What are measured 2-Port S-Parameters good for?
Optimum Match?p
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VNWA Matching Tool (1)
Allows to recalculate 2-portAllows to recalculate 2 port S-parameters to source andl d i d diff tload impedances different from 50 Ohms!
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VNWA Matching Tool (2)
Complex conjugate of Complex conjugate of p j gsource impedance
=
p j gload impedance
==filter input impedance
=filter output impedance
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Matching Analysis with VNWA Matching ToolOptimum: Zin = Zout = 610 Ω
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Forced Impedance Match using ResistorsForced Impedance Match using Resistors
50 Ω 560 Ω 610 Ωhttp://www.sdr-kits.net/ 23
50 Ω + 560 Ω = 610 Ω
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Match works except for increased LossMatch works except for increased Loss
Si l t d ithSimulated withMatching Tool
≈ 21.8 dB
Measured withresistive match
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Effect of two 560 Ω Resistors in Signal Path: VNWA Complex Calculator
21 7 dB additional attenuation http://www.sdr-kits.net/ 25
21,7 dB additional attenuation
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This can also be „properly“ simulated!Simulation Tool QUCS
htt // f t/• http://qucs.sourceforge.net/• Universal circuit simulator
F• Free• No restrictions
E t• Easy to use• Grafics and data export needs
b hhttp://www.sdr-kits.net/ 26
brush up
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Measured S-Parameters in QUCSMeasured S Parameters in QUCS
measuredS-parameterspfrom s2p-file
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Matching Simulation in QUCSMatching Simulation in QUCS
Standard diagrammoutput a bit strange
→ Export simulation resultto VNWA
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Comparison QUCS-Simulation vs. Measurement
d ithi l t d measuerd withVNWA
simulatedwith QUCS
PERFECT!PERFECT!
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Free Filter Design Software (1): Elsie – for LC-Filters
• http://tonnesoftware.com/elsiedownload.html• LC-Filter Designer and AnalyzerLC Filter Designer and Analyzer• Student version restricted to 7 dipols• Numerical simulation results export easily toNumerical simulation results export easily to
s2p-file!
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Free Filter Design Software (2): Dishal – for Crystal Filters
• http://www.bartelsos.de/dk7jb.php/quarzfilter-horst dj6evhorst-dj6ev
• Crystal filter designer and analyzer• Simulates without crystal losses• Simulates without crystal losses• S21-simulation results can be exported
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Free Filter Design Software (3):AADE Filter Design - for all filters
• http://aade.com/filter32/download.htm U i l filt d i d l• Univeral filter designer and analyzer
• Free, but with nag screenE t• Easy to use
• Numerical simulation results cannot bet d
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exported
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Design 3 Pole Butterworth π-Band Pass for 5 MHz with 3 MHz Bandwidth at 50 Ω
Filter Design with Elsiehttp://www.sdr-kits.net/ 33
Filter Design with Elsie
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Elsie Simulation ResultElsie Simulation Result
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Modify Components to standard Values andfinite Q …
simulation with finite Qhttp://www.sdr-kits.net/ 35
simulation with finite Q
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…and export Simulation into s2p-file forComparison with Measurement.
Export
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Filter HardwareFilter Hardware
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ComparisonMeasurement vs. Elsie Simulation
S21 S11 measured - Plot1 Plot2 Elsie simulation
eof
ucto
rS21, S11 measured Plot1, Plot2 Elsie simulation
lel
nanc
es
indu
para
lre
son
serie
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Measuring / Selecting Crystals:VNWA Crystal Analyzer
e g transmissione.g. transmission(S21-measurement)
Th t d dhttp://www.sdr-kits.net/ 39
Thru standard
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The VNWA Crystal Analyzer Tool:Find 3 similar Crystals…
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With these we want to build a Crystal Filter→ Enter Crystal Parameters into AADE
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WA
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AADE Minimum Loss (Cohn) DesignAADE Minimum Loss (Cohn) Design
186 Ω 66 pF 66 pF
186 Ω66 pF 66 pF
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Simulation in QUCS at 50 Ω using standardComponent Values
Crystals simulated with1 fil bt i d b VNWAs1p-file obtained by VNWA
measurement!
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Crystal Filter HardwareCrystal Filter Hardware
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Crystal Filter: Measurement vs. Simulation at 50 Ω
S21, S11 measurement - Plot1, Plot2 QUCS simulationS21, S11 measurement Plot1, Plot2 QUCS simulation
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Crystal Filter: Measurement vs. Simulation at 186 Ω
S21, S11 measurement - Plot1, Plot2 QUCS simulationS21, S11 measurement Plot1, Plot2 QUCS simulation
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Now we are able toNow, we are able to…
• Measure components• Measure components• Design filtersg• Simulate filters• Measure filters
Try it foryourself!
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yourself!