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A novel method for harmonic detection based on CMOS log-domain continuous wavelet transform circuit. (Chinese. English summary) Zbl 1174.94419

Summary: The wavelet-based harmonic detection algorithm is mostly programmed in PC or DSP. Because of high computational cost as well as requiring analog-to-digital converter, it’s difficult for harmonic detection instrument to operate in real time and wide frequency range. The power consumption is also high. A novel method based on low-voltage and low-power consumption log-domain continuous Morlet wavelet transform circuits is presented for harmonic detection. To measure harmonics, the wavelet transform of harmonic signal is performed by analog CMOS VLSI composed of analog filter bank, whose impulse response is Morlet wavelet. Nonlinear least square method is employed to obtain the transfer function of the filter with CMOS log-domain integrators as main building blocks. By changing the values of integrators’ bias currents, wavelet transforms of harmonic signal at various scales can be performed. SPICE simulation results show that the method is feasible.

MSC:

94C12 Fault detection; testing in circuits and networks
42C40 Nontrigonometric harmonic analysis involving wavelets and other special systems
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