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PA Intermodulation Distortion
Measurements Using the PNA
María Jesús Cañavate Sánchez
Index
Galashiels
Orkney
1. Introduction: characterization of a power amplifier
2. PNA N5225A
3. S-Parameters
4. AM/AM
5. A...
1. Introduction: characterization of a
power amplifier
Galashiels
Orkney
S-Parameters
DUT: Amplifier
1. Introduction: characterization of a
power amplifier
Galashiels
Orkney
Nonlinear characteristic
AM/AM and AM/PM compress...
1. Introduction: characterization of a
power amplifier
Galashiels
Orkney
Intermodulation distortion
DUT: Amplifier
Frequen...
2. PNA N5225A
Galashiels
Orkney
- Number of ports: 4
- Frequency range: 10MHz – 50GHz
- Max. port power, 20GHz: +13dBm
- R...
2. PNA N5225A
Galashiels
Orkney
Damage: +15dBm
Damage: +30dBm
Damage: +43dBm
Coupling factor: 15dB
3. S-Parameters
Galashiels
Orkney
Power flow analysis (for all types of PA measurements)
3. S-Parameters
Galashiels
Orkney
Before calibration: make sure settings are at desired levels
3. S-Parameters
Galashiels
Orkney
Select power and internal attenuators levels
- Output power: -10 dBm
- Gain: 26 dB
- Ext...
3. S-Parameters
Galashiels
Orkney
Calibration performance (for all types of PA measurements)
 Source–power calibration at...
3. S-Parameters
Galashiels
Orkney
Calibration performance
Source–power calibration Two-port calibration
3. S-Parameters
Galashiels
Orkney
Measurements
4. AM/AM
Galashiels
Orkney
S21 measurement under a power sweep condition
- Attenuator settings are fixed
- Source-power ca...
4. AM/AM
Galashiels
Orkney
S21 measurement example
Gain
AM/AM
5. AM/PM
Galashiels
Orkney
Procedure:
 S21 measurement under a power sweep condition
(AM/AM).
 Change the S21 measuremen...
6. Two-tone test
Galashiels
Orkney
2 different configurations (option 087):
 Using internal PNA components
 Only extra c...
6. Two-tone test
Galashiels
Orkney
Using internal PNA components:
6. Two-tone test
Galashiels
Orkney
Using external components:
6. Two-tone test
Galashiels
Orkney
6. Two-tone test
Galashiels
Orkney
Frequency tab:
6. Two-tone test
Galashiels
Orkney
Power tab:
Thank you!
Galashiels
Orkney
PhD student: María Jesús Cañavate Sánchez // mjc31@hw.ac.uk
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PA Intermodulation Distortion Measurements Using the PNA

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Presentation by Maria Jesus Canavate Sanchez, 'PA Intermodulation Distortion Measurements Using the PNA', on Wednesday 16 December at Heriot-Watt University

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PA Intermodulation Distortion Measurements Using the PNA

  1. 1. PA Intermodulation Distortion Measurements Using the PNA María Jesús Cañavate Sánchez
  2. 2. Index Galashiels Orkney 1. Introduction: characterization of a power amplifier 2. PNA N5225A 3. S-Parameters 4. AM/AM 5. AM/PM 6. Two-tone test
  3. 3. 1. Introduction: characterization of a power amplifier Galashiels Orkney S-Parameters DUT: Amplifier
  4. 4. 1. Introduction: characterization of a power amplifier Galashiels Orkney Nonlinear characteristic AM/AM and AM/PM compression of a typical Traveling Wave Tube (TWT) amplifier.
  5. 5. 1. Introduction: characterization of a power amplifier Galashiels Orkney Intermodulation distortion DUT: Amplifier Frequency spectrum of the amplifier input signal: 5 unmodulated carriers. AM/AM and AM/PM compression of a typical Traveling Wave Tube (TWT) amplifier. Frequency spectrum of the amplifier output signal: 5 unmodulated carriers and IMP3.
  6. 6. 2. PNA N5225A Galashiels Orkney - Number of ports: 4 - Frequency range: 10MHz – 50GHz - Max. port power, 20GHz: +13dBm - Receiver damage level: +15dBm
  7. 7. 2. PNA N5225A Galashiels Orkney Damage: +15dBm Damage: +30dBm Damage: +43dBm Coupling factor: 15dB
  8. 8. 3. S-Parameters Galashiels Orkney Power flow analysis (for all types of PA measurements)
  9. 9. 3. S-Parameters Galashiels Orkney Before calibration: make sure settings are at desired levels
  10. 10. 3. S-Parameters Galashiels Orkney Select power and internal attenuators levels - Output power: -10 dBm - Gain: 26 dB - External attenuation: 6 dB - Internal attenuation: 15 dB - Measured S21 drops by the attenuation - After calibration, attenuator losses will be removed - Before calibration: Gain = 5 dB - After calibration: Gain = 26 dB - Internal attenuation still not available
  11. 11. 3. S-Parameters Galashiels Orkney Calibration performance (for all types of PA measurements)  Source–power calibration at the input point of the amplifier  To ensure a constant and known power  Material needed: power sensor  Two-port SOLT calibration  To remove effects of the external and internal attenuators  Material needed: mechanical calibration kit  SOLT: short-open-load-through
  12. 12. 3. S-Parameters Galashiels Orkney Calibration performance Source–power calibration Two-port calibration
  13. 13. 3. S-Parameters Galashiels Orkney Measurements
  14. 14. 4. AM/AM Galashiels Orkney S21 measurement under a power sweep condition - Attenuator settings are fixed - Source-power calibration at source and receiver ports
  15. 15. 4. AM/AM Galashiels Orkney S21 measurement example Gain AM/AM
  16. 16. 5. AM/PM Galashiels Orkney Procedure:  S21 measurement under a power sweep condition (AM/AM).  Change the S21 measurement from log magnitude format to phase format.  No new calibration is required.
  17. 17. 6. Two-tone test Galashiels Orkney 2 different configurations (option 087):  Using internal PNA components  Only extra cables are required  Using external components  Combiner  Coupler  Extra cables
  18. 18. 6. Two-tone test Galashiels Orkney Using internal PNA components:
  19. 19. 6. Two-tone test Galashiels Orkney Using external components:
  20. 20. 6. Two-tone test Galashiels Orkney
  21. 21. 6. Two-tone test Galashiels Orkney Frequency tab:
  22. 22. 6. Two-tone test Galashiels Orkney Power tab:
  23. 23. Thank you! Galashiels Orkney PhD student: María Jesús Cañavate Sánchez // mjc31@hw.ac.uk

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