ICEBreaker Option: S- functions Verification
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ICEBreaker Option S-function Verification Tool Sept 2010 - Using your VNA at its full power -
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Transcript of ICEBreaker Option: S- functions Verification
ICEBreaker
Option S-function Verification Tool
Sept 2010
- Using your VNA at its full power -
© NMDG 2010 2
Outline
● From S-parameters to S-functions● Potential Pitfalls● Confidence in S-functions through verification● ICEBreaker – Option S-function Verification Tool
● Measured datasets
● Datasets, predicted by S-functions
● Comparison tools
● Conclusion
© NMDG 2010 3
From S-parameters to S-functions
S-parametersS-parameters
S-functionsS-functions
Linear Applications
“NonLinear” Applications
AllOther
NonLinearApplications
?
? ?
© NMDG 2010 4
The Potential Pitfalls
Bi j =Sf ijx1a1 f 0 , a2 f 0 , vdcSf ijkl a1 f 0 , a2 f 0 , vdc Ak l f 0
Sfcijkl a1 f 0 , a2 f 0 , vdc Ak* l f 0
● Constantness of LSOP
● Interpolation Capability
● Linearity Assumption
ICEBreakerOption S-function Verification Tool
Large-Signal Operating Point“Tickle tones”
© NMDG 2010 5
Confidence in S-functions through Verification
© NMDG 2010 6
Pitfall 1: Constantness of LSOPPart of S-function Visualization
Select LSOP variable
Filter for a LSOP variableand value
Variation on fixed input power
Variation ondrain bias voltage
© NMDG 2010 7
Pitfall 2: Interpolation CapabilityPart of S-function Extraction Visualization
amplitude of complex error for measured and predicted b2
zoom inon result
Number of measurements
zoom inontickling
© NMDG 2010 8
Pitfall 3: Linearity AssumptionDC
k f0
f0
f0
or
ZL
Large-SignalSource
TicklingSource
Bias
DC Bias
Large-Signal
Small-Signalfor harmonics
Switching Amplifier design
DC Bias a2k f 0
Lk f 0 L2 f 0 L3 f 0
a22 f 0 Still small signal?a23 f 0
© NMDG 2010 9
ICEBreaker – Option S-function Verification Tool
ICEBreakerDataset
● Measured Data
● Realistic Sweep Plan
● Under multi-harmonic Load-Pull
PredictedICEBreakerDataset
CompareDatasets
● Using S-function ● Derived Quantities
● Incident / Reflected Waves
● Voltage and Current
● Absolute Error
● Relative Error
© NMDG 2010 10
Generation of “S-function Predicted Dataset” in ICEBreaker
GenerateS-function basedDataset
CompareDatasetandS-function basedDataset
© NMDG 2010 11
Absolute Comparisons with S-function Predictions
Quantity forwhich to comparemeasurement andprediction
MeasurementsS-functionPrediction
Absolute Error
● Derived quantities➢ Idc_out➢ Gain➢ Pdel_in➢ Pdel_out➢ PAE➢ ..
● Basic quantities➢ Incident waves➢ Reflected waves➢ Voltages / Currents
● Style➢ Points➢ Contours➢ Points & Contours
Idc_out
© NMDG 2010 12
Relative Comparisons with S-function Predictions
b_out(3f0)
● Versus➢ Harmonic index➢ Harmonic refl
● Desired● Realized
Relative Error (dB)
© NMDG 2010 13
Conclusion
For more information [email protected]
www.nmdg.be
Using the complex multi-harmonic sweep plans of ICEBreaker it is easy to verify the S-functions under a
series of realistic conditions
- Use your VNA at its full power -
