Generator structures and methods that provide low-harmonic...

Electrical computers: arithmetic processing and calculating – Electrical digital calculating computer – Particular function performed

Reexamination Certificate

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Reexamination Certificate

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07072925

ABSTRACT:
Simple, inexpensive waveform generators and methods are provided that generate curvilinear waveforms which comprise a fundamental sinusoid and harmonics that are either absent or are significantly reduced from the fundamental. In an exemplary method, a generator converts a first straight-line waveform into a level-shifted, frequency-doubled second straight-line waveform, multiplies the straight-line segments of the first and second waveforms to provide a first curvilinear waveform, and sums this curvilinear waveform with a scaled version of the first straight-line waveform to realize a second curvilinear waveform with further-reduced harmonics.

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“Sine Wave Generation Techniques”, National Semiconductor Application Note AN 263, Mar. 1981, National Semiconductor, Arlington, Texas.
“Versatile Waveform Generator”, Maxim Application Note, Maxim Integrated Products, Mar. 13, 2000, Sunnyvale, California.

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