On-chip Generation of Sine-wave Summing Digital Signals: an Analytic Study Considering Implementation Constraints

Abstract

Abstract-In the context of biosensor as much as Built-In-Self Test (BIST), on-chip sine-wave signal generation is a recurring research topic. Considering the implementation constraints, it implies a trade-off between the amount of resources and the signal quality. An attractive solution consists in combining several digital signals to build this analog sine-wave. The objective of this paper is to give an analytic study of various potential digitalbased solutions. Thanks to this study, we prove that the technique consisting in setting the phase shifts and various amplitude values of the square-wave signals is the most efficient approach. This study allows the selection of the optimal square-wave signal parameters to cancel low-order harmonics of the generated signal. We proposed a solution for specification-oriented definition of the architecture.

A Hybrid Bioimpedance Spectroscopy Architecture for a Wide Frequency Exploration of Tissue Electrical Properties

“…The digital signal is then scaled and delayed multiple times and the sum of the results is used to construct a sine wave of the targeted frequency. The scale coefficients and the phase shifts are computed so that the constructed signal has the lowest total harmonic distorsion possible [4]. A current driver is then used to convert the constructed sine wave voltage to an excitation current.…”