ZVxPlus Technology Update: Pulse And Modulation
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ZVxPlus Technology Update - Pulse and Modulation - May 2009
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Transcript of ZVxPlus Technology Update: Pulse And Modulation
ZVxPlus TechnologyUpdate
- Pulse and Modulation -
May 2009
2 © Copyright 2009
Outline
Average Pulse Mode Pulse Profile Mode Modulation Mode Conclusion
3 © Copyright 2009
EPA120B-100P
EPA120B-100P• high efficiency heterojunction power FET• power output: + 29.0dBm typ.• power gain: 11.5dB typ. @ 12 GHz
4 © Copyright 2009
CW versus Pulse Mode
CW Signal – 1 GHzPulsed Period: 500 usPulse width : 50 us
Amplitude drops
Amplitude drops
Pulsed Period: 100 usPulse width : 0.5 us
2kHz
20kHz10kHz
2MHz
5 © Copyright 2009
Pulse Spectrum with VNA: selection of IF BW
IF Bandwidth < Tone spacing
IF BW filter must cut off sharply
IF BW Filter:not sharp enough
6 © Copyright 2009
Average Pulse Mode
IF Bandwidth < Tone spacing
IF BW Filter: high selectivityOnly the main spectral component is measured
7 © Copyright 2009
ZVxPlus in Average Pulse Mode
Port 1
Synchroniser
Port 2
InternalExcitationSource
ReflectometerReceiver
20 dB
EPAExternalPulsedRF Excitation
SpectrumAnalyzer
Port 3
Proper selection of IF BW < Rep rate
10 MHz
8 © Copyright 2009
EPA120 in Pinch off under CW Stimulus
9 © Copyright 2009
EPA120 in Pinch off under Pulse Stimulus – Average Pulse Mode
Part of the informationIs missing ->Amplitude of waveforms arecompletely different
10 © Copyright 2009
Pulse Profiling Mode
Measurement of all spectral components ● in amplitude and phase● for fundamental and harmonics
ZVA Pulse Profile Capabilities:● BW: up to 30 MHz● Repetition rate: appr. 300 Hz
a1 a2
b2b1
1GHz, 2 GHz, 3GHz, ...
11 © Copyright 2009
Pulse Profile: Spectrum and Waveforms
30 20 10 10 20 30
100
60
40
2107 4107 6107 8107 1106
0.015
0.01
0.005
0.005
0.01
0.015
30 20 10 10 20 30
120
100
60
40
20
2 107 4107 6107 8107 1106
0.2
0.1
0.1
0.2
a1 b2
MHz MHz
Fundamental
Sec HarmThird Harm
Harmonics
Fundamental
12 © Copyright 2009
Modulation Mode: Spectrum and Waveforms
30 20 10 10 20 30
120
100
60
40 30 20 10 10 20 30
140
120
100
80
60
40
20
0.0002 0.0004 0.0006 0.0008 0.001
0.2
0.1
0.1
0.2
0.0002 0.0004 0.0006 0.0008 0.001
0.01
0.005
0.005
0.01
0.015
Two-tone – 1 kHz spacing
MHz
Fundamental
Sec Harm
MHz
Third Harm
Harmonics
Fundamental
13 © Copyright 2009
Modulation Mode: Spectrum and Waveforms
7.5 5 2.5 2.5 5 7.5
140
120
100
60
0.00002 0.00004 0.00006 0.00008 0.0001
0.005
0.01
0.015
0.02
0.025
7.5 5 2.5 2.5 5 7.5
140
120
100
60
40
20
0.00002 0.00004 0.00006 0.00008 0.0001
0.05
0.1
0.15
0.2
0.25
0.3
0.1 0.05 0.05 0.1
120
110
100
80
70
60
50Pseudo Random Noise – 5 MHz BW 10 kHz spacing
Fundamental
Sec Harm
Third Harm
Harmonics
Fundamental
14 © Copyright 2009
Conclusion
The ZVxPlus allows to characterize the nonlinear behavior of components under• Pulse excitation in average pulse mode• Pulse excitation in pulse profile mode• Periodic modulation in modulation mode
The characterization includes fundamental and harmonics
For more information [email protected]
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