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RF circuit design using ADS

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This presentation illustrates the experience gained by me during a RF circuit design course. The course requirements included designing, fabricating and simulating various couplers, an amplifier, a low noise amplifier and an oscillator. Operating frequency was centered around 2.4 GHz.

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RF circuit design using ADS

  1. 1. Final Presentation Ankit Master Spring 2009
  2. 2.  Couplers/Dividers  Branch Line Coupler  Wilkinson Coupler  Modified Wilkinson Coupler  Ratrace Coupler  Gain Block  Low Noise Amplifier  Oscillator
  3. 3. - Branchline couplers are 3 dB directional couplers - The power fed at the input port is divided equally between the two output ports. - However, there is a 90-degree phase difference in the output of the two ports
  4. 4. S- parameters Magnitude (dB) (@ 2.4 GHz) simulated measured S11 -30.03 -14.55 S12 -2.97 -2.97 S21 -2.97 -3.02 S22 -30.03 -15.16 S13 -3.05 -4.06 S31 -3.05 -4.15 Phase Difference between outputs obtained on ports 2 and 3: SIMULATED: 89.890 MEASURED: 91.000
  5. 5. S11 S12 S21 S22 Branch line Coupler: Magnitude plots
  6. 6. S13 Branch line Coupler: Magnitude plots S31 S12 – S13 Branch line Coupler: Phase plot
  7. 7. - It is a n-port network commonly used for combining and splitting power. - This circuit achieves isolation at the output ports while maintaining matched condition on all ports.
  8. 8. S- parameters Magnitude (dB) (@ 2.4 GHz) simulated measured S11 -20.01 -25.56 S12 -3.05 -3.10 S21 -3.05 -3.53 S22 -26.26 -11.08 S13 -3.05 -2.98 S31 -3.05 -3.33 Phase Difference between outputs obtained on ports 2 and 3: SIMULATED: 0.000 MEASURED: -1.480
  9. 9. S11 S12 S21 S22 Wilkinson Coupler: Magnitude plots
  10. 10. S13 Wilkinson Coupler: Magnitude plots S31 S12 – S13 Wilkinson Coupler: Phase plot
  11. 11. S- parameters Magnitude (dB) (@ 2.4 GHz) simulated measured S11 -38.28 -14.08 S12 -3.01 -3.36 S21 -3.01 -3.51 S22 -41.85 -12.21 S13 -3.01 -3.23 S31 -3.01 -3.33 Phase Difference between outputs obtained on ports 2 and 3: SIMULATED: 0.000 MEASURED: 0.8750
  12. 12. S11 S12 S21 S22 Modified Wilkinson Coupler: Magnitude plots
  13. 13. S13 Modified Wilkinson Coupler: Magnitude plots S31 S12 – S13 Modified Wilkinson Coupler: Phase plot
  14. 14. -This is a hybrid coupler - Like the Quadrature hybrid, the ratrace coupler is a 3-dB directional coupler -180-degree phase difference between output ports
  15. 15. S- parameters Magnitude (dB) (@ 2.4 GHz) simulated measured S11 -39.21 -12.19 S12 -3.00 -3.57 S21 -3.00 -3.64 S22 -39. 22 -13.11 S13 -39.58 -40.36 S31 -39.58 -40.45 S14 -3.01 -3.20 S41 -3.01 -3.34
  16. 16. S11 S12 S21 S22 Rat Race Coupler: Magnitude plots
  17. 17. S13 S31 S14 S41 Rat Race Coupler: Magnitude plots
  18. 18. S12-S13 S12-S14 Rat Race Coupler: Phase plot Phase Difference between outputs obtained at ports 2 and 3: SIMULATED: - 0.180 MEASURED: -36.380 Phase Difference between outputs obtained at ports 2 and 4: SIMULATED: - 178.800 MEASURED: - 172.810
  19. 19. -Active circuit which uses transistors to amplify the wea input signal -Device used: 2SEC5009
  20. 20. S- parameters Magnitude (dB) (@ 2.4 GHz) simulated measured S11 -18.999 -24.398 S21 6.354 3.893 S22 -19.00 -13.428 StabFact 1.004 -
  21. 21. -Low Noise amplifier is necessary at the input of a receiver to amplify the weak received signal with minimium amplification of noise -Device used: AT32011
  22. 22. Layout of the LNA in ADS Actual fabricated circuit
  23. 23. Noise Figure S-parameters
  24. 24. S- parameters Magnitude (dB) (@ 2.4 GHz) simulated measured S11 -10.475 -6.031 S12 -16.603 -17.940 S21 12.042 10.022 S22 -57.434 -54.278 StabFact 1.065 - NF min 1.961 - nf(2) 2.069 - Max Gain 12.762 -
  25. 25. -A local oscillator is used to combine the baseband signal with a high frequency RF signal during modulation - Device used: ATF33143
  26. 26. Layout in ADS Actual fabricated circuit (Apologies for the poor image quality)
  27. 27. Harmo simulated measured nic index HB.freq HB.vout HB.freq HB.vout (GHz) (dBm) (GHz) (dBm) 1 2.381 20.480 2.5975 10.02 2 4.761 -13.560 5.2075 -10.23 3 7.142 -3.331 7.7950 -21.43 S11 @ 4.751 - - - 2.35 dB GHz
  28. 28. - ADS is a very useful and powerful tool for building circuits - Reducing the number of parameters during optimization improves the chances of reaching the desired goal efficiently - Selection of a proper device is essential during the initial stages of the design to avoid complications in the latter stages of the project - Tuning is not as convenient as optimization

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