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High-frequency periodic time-domain waveform measurement system

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3 Author(s)
Sipila, M. ; Fac. of Electr. Eng., Helsinki Univ., of Technol., Espoo, Finland ; Lehtinen, Kari ; Porra, Veikko

A system is presented for the accurate measurement of high-frequency periodic time-domain voltage and current waveforms of a nonlinear microwave device. The measurements are performed in the time domain using a high-speed sampling oscilloscope. The results are Fourier-transformed into the frequency domain for error correction and then back into the time domain. An error-correction algorithm is presented that makes it possible to obtain accurate waveforms in spite of nonideal system components. Practical difficulties in measurement-system characterization are also discussed. An accurate circuit model for the measurement fixture is developed and its element values are determined. Measurement results are given showing the waveforms in a microwave transistor operated in the nonlinear region. The errors caused by signal processing are discussed

Published in:

Microwave Theory and Techniques, IEEE Transactions on  (Volume:36 ,  Issue: 10 )

Date of Publication:

Oct 1988

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