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Mostly-digital design of sinusoidal signal generators for mixed-signal BIST applications using harmonic cancellation

Auteur(s) : H. Malloug, M. Barragan, S. Mir, H. Le Gall

Doc. Source: IEEE 21st International Mixed-Signal Testing Workshop (IMSTW'16)

Publisher : IEEE

This work proposes a novel approach for the design of high-quality on-chip sinusoidal signal generators using digital circuitry. The proposed generation technique is based on a simple digital shift-register that provides a set of phase-shifted versions of a digital square-wave signal. These square-wave signals are conveniently combined using a harmonic cancellation strategy to yield a spectrally pure sinusoidal output signal. The proposed strategy allows cancelling low-frequency harmonics close to the fundamental component of the generated sinusoidal signal, while a simple first order low-pass filter is used to attenuate higher or- der harmonic components. A simple one-shot calibration strategy is also presented in order to compensate the effects of the main non-idealities affecting the dynamic linearity of the generator. Statistical behavioral simulations are provided to demonstrate the feasibility of the proposed generator.