Title :
An improved version of the almost periodic Fourier transform algorithm with applications in the large-signal domain
Author :
Dreifuss, J. ; Madjar, A. ; Bar-lev, A.
Author_Institution :
Dept. of Electr. Eng., Technion, Haifa, Israel
fDate :
3/1/1991 12:00:00 AM
Abstract :
The waveform balance (WB) approach is combined with a modified form of the almost periodic Fourier transform (APFT) algorithm, resulting in an approach in which the number of randomly selected sampling points is increased, the overall computation accuracy is enhanced, the spread among results is reduced, and the computation time is practically unchanged. This approach is applied to the evaluation of large-signal S-parameters of a MESFET and to the calculation of its 1-dB compression power, the intermodulation distortion products, and the third-order intercept points (IP3) for a range of frequencies. The results are in excellent agreement with those parameters that are available from the manufacturer´s measurements. The conversion gain of a MESFET mixer is calculated, and the reduced spread among the results is compared with that obtained by use of the original APFT algorithm
Keywords :
Fourier transforms; S-parameters; Schottky gate field effect transistors; equivalent circuits; intermodulation; nonlinear network analysis; power transistors; semiconductor device models; solid-state microwave circuits; APFT; MESFET mixer; almost periodic Fourier transform algorithm; conversion gain; intermodulation distortion products; large-signal S-parameters; randomly selected sampling points; third-order intercept points; waveform balance; Algorithm design and analysis; Computer interfaces; Fourier transforms; Frequency; MESFETs; Microwave circuits; Microwave devices; Signal analysis; Signal design; Time domain analysis;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
