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Automatic Neural Model Development for Power Amplifier

Automatic Neural Model Development for Power Amplifier. Na Weicong. Content. Example: Power Amplifier. Problem & Solution. Comparison & Conclusion. Automatic Neural-Network Structure Adaptation with Interpolation Approaches. Add training data

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Automatic Neural Model Development for Power Amplifier

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  1. Automatic Neural Model Development for Power Amplifier Na Weicong

  2. Content Example: Power Amplifier Problem & Solution Comparison & Conclusion

  3. Automatic Neural-Network Structure Adaptation with Interpolation Approaches Add training data & test data Yes Interpolation Approaches n, j Overlearning ? Training & Test Training & Test Add a hidden neuron Stop Goodlearning n-1, j Stop Add a hidden neuron Goodlearning Yes No Underlearning Underlearning Has it been Trained before? Add a hidden neuron No

  4. Example: MOSFET vs. Power Amplifier Id ··· Vgs Vds Pin= -5~+5 dBm Vdin= 2~3 V RL= 50~60 f= 2.1~2.8 kHz Vgs= 0~4 V Vds= 0~4 V

  5. Interpolation Algorithm • Select the type of interpolation formula. Linear Function, 2nd order Polynomial Function etc. • Select the points which can represent the interpolation region. These points are always the boundary points of the region. • Calculate the equation to obtain the parameters in the interpolation equation. • Substitute the coordinates of the interpolated point into the interpolation equation whose parameters we have known, then we will get the final result.

  6. Step1: Select the type of interpolation formula. MOSFET:2nd order polynomial function Power Amplifier: 3rd order polynomial function

  7. MOSFET:2nd order polynomial function Power Amplifier: 3nd order polynomial function k: the number of samples

  8. Step2: Select the points which can represent the interpolation region. MOSFET: k =5+4=9 6 4 5 2 4 0 64 0 2 4 Power Amplifier: k =64+16=81 16 19

  9. Step3: Calculate the equation to obtain the parameters in the interpolation equation. Problem: matrix is a singular matrix! Solution: Change 3rd order polynomial function!

  10. Comparison（Example：Power Amplifier） *tested by the same test data

  11. Thanks!

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