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Phase Noise and Noise Measurement

Phase Noise and Noise Measurement. Pengcheng Jia Nov 21, 2002. Phase Noise. Sth New. Phase Noise Measurement with PSA (precision spectrum analyzer) Mode->Phase Noise->LogPlot

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Phase Noise and Noise Measurement

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  1. Phase Noise and Noise Measurement Pengcheng Jia Nov 21, 2002

  2. Phase Noise

  3. Sth New • Phase Noise Measurement with PSA (precision spectrum analyzer) Mode->Phase Noise->LogPlot But pay attention to noise floor of the PSA. You can use noise floor cancellation function or use the HP11848 Phase noise system

  4. Phase Noise Origins • 1/f Noise of Semiconductor Transistor • DC Bias related noise (Shot Noise) • Thermal Noise from Resistors

  5. Phase Noise Basic

  6. DUT G=18dB Power Spliter Phase Shifter Source Residual Noise Measurement 20 dB Attenuator 11848 Phase Noise Interface +8dBm R Port L Port +10dBm GPIB Control 0.01Hz 100KHz 3561A Dynamic Signal Analyzer • Phase shifter is used to achieve quadrature • Attenuator is used to keep input power at required level • Phase noise of source will not affect residual noise of DUT when quadrature is achieved

  7. 3048 System 11729 11848 3561 Spectrum Analyzer

  8. Phase Noise Measurements Phase Noise without amplifiers Phase noise of a broadband amplifier

  9. 3048A Phase Noise Software • Tiger is the 3048A system controller • Start in MS-Dos Mode • At the command prompt, enter c:\go • Select 13 as the printer type and 0 as the screen mode. The other settings are user preference • Now you are at c:\noise\3048> • Run cal.exe for calibration and PN.exe for measurement

  10. Instrument Addresses • Run PN.exe, Main Menu->System->Instrument Instrument Model Address FFT Analyzer 3561A 712 RF Analyzer 8567A 718 (optional for offset from 100K to 40MHz) Signal Srce 1 Signal Srce 2 Down Converter 11729C 706 (optional)

  11. Getting system ready • Functional Checks • Quick Check • Performance checks • Calibrations Read appendix for the time and sequence of calibration

  12. Run PN.exe 1.Type of measurement->Phase noise without using PLL (for residual phase noise measurement) Start/Stop frequency are the offset frequency from the carrier 2. Parameters Input carrier frequency and select detector

  13. Continue… • Instrument control Select system connections • Define graph Configure the displayed graph • System configuration->Instruments addresses->Input addresses

  14. File System • Test file Directory Save all the configurations for the measurement • Result file directory Save the measurement result in this directory ***Always choose this directory before you save your result, otherwise you only save the configurations, not the data!!! • Run Read_res.exe to convert *.res file to data file which can be used in graph tools. Go to mishrayork web->document for the file.

  15. Calibration-theory

  16. Calibration-operation • For the first time, run calibration Select Derive from measured beat tone ->exit to main menu->New measurement ->”Y”->Select 1KHz as beat-tone (range from 1Hz to 50KHz), input the beat tone signals to the R and L input of the 11848 interface->Proceed->get detector constant Then change connection back and measure PN • Next time, go to calibration->use current detector constant

  17. Measurement • Pay attention to the right and left channel power level • For frequency 1.2 G to 18G L +7->+10dBm R 0->+10dBm Keep R channel close to 10dBm, the higher R signal, the lower noise floor

  18. Noise Figure

  19. Measurement System Noise Figure Meter-8970B Noise Source Driver CW Generator-8673G Output power-8dBm Noise Source - 346C Noise Input LO Signal Input Test Set-8971B Working Mode:SSB3 From 4-18GHz Down Convert to 450MHz Single Side Band Noise

  20. Single MMIC Measurement Microstrip Probe Bias For MMIC Noise Output Noise Input MMIC

  21. Combiner Measurement Bias For MMICs Noise Source Driver Input Noise Input Noise Source Noise Output Power Combiner Heat Sink

  22. Measurement Theory • The Noise Figure Meter output noise at two different noise temperature • Get the G and Na from the measurement • Calibrate to eliminate the affect of the loss of the cable and connectors Output Noise Power No N2 N1 Na Noise Temperature-T T1 T2

  23. Measurement Result

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