Depot des Theses - 4-channel Time-Domain Interleaved High Sampling Rate System based on Track & Hold Amplifiers for Pulsed Characterization of High Power Non-Linear Amplifiers

High power communications particularly RADAR applications are based upon radio frequency pulse signal modulation. These RF pulsed signals offer high complexities when it comes to accurate measurement as it occupies infinite frequency spectrum bandwidth. Therefore to obtain instant information about amplitude and phase it’s very important to measure the modulated signal with respect to change in time. Time-domain measurements have their own limitations when it comes to bandwidth and resolution. This work proposes a new measurement technique based on Track and Hold amplifiers which simplifies the analog circuitry to a great extent. A fully calibrated 4-channel time-domain measurement system has been built and was used to characterize non-linear power amplifiers under continuous sinusoidal and pulse modulated signals in terms of envelope measurement or RF transient characterization. The measurement results were analyzed and validated by existing time-domain measurement systems. Utilizing the advantages of the THA based system a coherent time interleaving sampling systems was developed and frequency sampling rate of 100fo for CW and 10fo for pulsed modulated signals was achieved. Complete RF transient response for pulse modulated signals different load conditions has been presented. Créé par AHMED Sajjad 3 oct. 2014 Version 0.1

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Thèse de doctorat

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Disciplines Doctorat/Électronique des Hautes Fréquences et Optoélectronique

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Created at

3 oct. 2014

Last modified at

4 oct. 2014

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Author

AHMED Sajjad

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legerp02

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