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Low-Distortion Sine Wave Generation Using a Novel Harmonic Cancellation Technique

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4 Author(s)
Bharath Karthik Vasan ; Department of Electrical and Computer Engineering, Iowa State University, Ames, IA, USA ; Siva Kumar Sudani ; Degang J. Chen ; Randall L. Geiger

A novel technique is proposed to generate robust, low distortion sine waves. In this method, outputs of a phase shift oscillator (PSO) are weighted and summed to obtain multiple outputs with very low distortion and precise phase relationship. The method allows a programmable number of harmonic distortion components to be cancelled over a wide frequency range. This work derives the condition for the weights on the outputs of the PSO to be a real quantity, and demonstrates how this can be used to generate low distortion sine waves. With the proposed method, in an N-stage PSO, harmonics up to N-2th can be canceled. Simulation results using commercial operational amplifier spice models are presented to demonstrate low distortion sine wave generation over 2 kHz-180 kHz frequency range. The method has been experimentally verified using extremely low-cost, discrete components to produce 100 dB total harmonic distortion (THD) sine wave.

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IEEE Transactions on Circuits and Systems I: Regular Papers  (Volume:60 ,  Issue: 5 )