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Using the LSNA in Device Characterization for PA Design

Using the LSNA in Device Characterization for PA Design. IEEE Topical Workshop, San Diego. Gary Simpson M A U R Y M I C R O W A V E 2900 Inland Empire Blvd., Ontario, California 91764-4804. Device Characterization. Required for PA Design Determine Device Capabilities

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Using the LSNA in Device Characterization for PA Design

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  1. Using the LSNA in Device Characterization for PA Design IEEE Topical Workshop, San Diego Gary Simpson M A U R Y M I C R O W A V E 2900 Inland Empire Blvd., Ontario, California 91764-4804

  2. Device Characterization • Required for PA Design • Determine Device Capabilities • Determine Required Matching • Load Pull is a Common Method

  3. What Is Load Pull? • Measurement • vs. • Impedance

  4. Value of Load Pull in PA Design • Performance Under Actual Operating Conditions • Most Direct Method to Determine Matching • Device Model not Needed • But – Verify Device Model if Desired

  5. Load Pull Contours

  6. What is the LSNA? • Large Signal Network Analyzer • Measure Incident/Reflected Waves • Get Fundamental and Harmonic Data • Time Domain from Fourier Transform • Measure Modulated Signal • Also Measure Small Signal S-Parameters

  7. LSNA Calibration • 1. VNA Style Calibration • 2. Power Meter for Absolute Power • 3. Harmonic Phase Reference to Calibrate the Harmonics

  8. LSNA Data – Waveform 1.8 GHz Silicon BJT Power Transistor

  9. LSNA DataModulated Waveform

  10. LSNA DataModulated Waveform

  11. LSNA Data – Dynamic Load Lines

  12. LSNA DataHarmonic Distortion

  13. LSNA DataBreakdown Analysis

  14. Using the LSNA with Load Pull • Multiple Instrument Functions • Measure Power, Gain • Measure am/am and am/pm • Measure Waveform vs. Impedance • Measure gamma-in • Measure gamma-load

  15. Load Pull with LSNA

  16. Waveform vs. Impedance

  17. Load Pull – Passive Reflection DUT TUNER b2 a2 Reflection

  18. Load Pull – Active Reflection DUT TUNER b2 a2 Reflection

  19. Real-Time Load Pull • Inject Offset Frequency • Sweep all Phase • Result: Measure a Circle of Impedances • Sweep Magnitude Also • Result: Measure a Region of Impedances

  20. Real-Time Load Pull Patent Pending

  21. Advantage of Real-Time Load Pull • Cover Higher Reflection than Passive Tuner • Extremely Fast Measurement • Next Generation Load Pull

  22. Real-Time Load Pull Status • Works Now with Average Bias • Dynamic Bias Measurement Needed to Know Bias and Eff vs. Impedance • Dynamic Bias Measurement is Coming • Active Injection works Now to Enhance Matching Range

  23. Conclusions • The LSNA Provides More Device Data • The LSNA Enhances Load Pull • More Data vs. Impedance • Active Injection Provides More Matching • Real-Time Load Pull Provides High Speed and High Matching

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