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Complex Oscillation-Based Test and Its Application to Analog Filters

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4 Author(s)
Callegari, S. ; Dept. of Electron., Comput. Sci. & Syst. (DEIS), Univ. of Bologna, Bologna, Italy ; Pareschi, F. ; Setti, G. ; Soma, M.

Testing is a critical factor for modern large-scale mixed-mode circuits. Strategies for mitigating test cost and duration include moving significant parts of the test hardware on-chip. This paper presents a novel low-overhead approach for design for test and built-in self-test of analog and mixed-mode blocks, derived from the oscillation-based test framework. The latter is enhanced by the use of complex oscillation regimes, improving fault coverage and enabling forms of parametric or specification-based testing. This technique, initially proposed targeting large subsystems such as A/D converters, is here illustrated at a much finer granularity, considering its application to analog-filter stages, and also proving its suitability to backfit existing designs. The simple case of a switched-capacitor second-order bandpass stage is used for illustration discussing how deviations from nominal gain, central frequency, and quality factor can be detected from measurements not requiring A/D stages. A sample design is validated by simulations run at the layout level, including Monte Carlo analysis and simulations based on random fault injections.

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Circuits and Systems I: Regular Papers, IEEE Transactions on  (Volume:57 ,  Issue: 5 )