Electricity: measuring and testing – Impedance – admittance or other quantities representative of... – Parameter related to the reproduction or fidelity of a...
Patent
1991-04-11
1992-05-12
Wieder, Kenneth A.
Electricity: measuring and testing
Impedance, admittance or other quantities representative of...
Parameter related to the reproduction or fidelity of a...
324 78F, 324620, 328162, 328165, 328167, G11C 2702
Patent
active
051131390
ABSTRACT:
Waveform data read out of a memory is converted by a D/A converter into an analog waveform, and amplified by an amplifier to generate a waveform signal. To cancel a distortion generated in the amplifier, a composite waveform composed of a distortion canceling signal waveform and a fundamental frequency signal waveform to be generated is written into the memory. To determine a distortion canceling signal, the fundamental frequency component in the signal waveform is attenuated by a notch filter. The signal waveform is then converted by an A/D converter into a digital multi-sine waveform. This waveform is input to a computation and control part and subjected to a Fourier transform analysis to compute the amplitude and phase of each harmonic component. Further, the output of the amplifier the memory, is fed via the notch filter and the A/D is input to the computation and control part, where it is subjected to a Fourier transform analysis to compute the amplitude and phase of each distortion component. At the same time, the output of the amplifier is converted into digital waveform data without being applied to the notch filter and the data is subjected to a Fourier transform analysis in the computation and control part. The amplitude and phase of the fundamental frequency component are then computed. Based on the results of these Fourier transform analyses, the amplitude and phase of each frequency component of the distortion canceling signal are determined and are used to compute composite waveform data composed of the distortion canceling signal and the fundamental frequency signal.
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Advantest Corporation
Solis Jose M.
Wieder Kenneth A.
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