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Oscillation Test Scheme of SC Biquad Filters Based on Internal Reconfiguration

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Abstract

In this paper, we explore general conditions for the oscillation based test of switched-capacitor biquad filter stages. Expressions describing the characteristics of a filter stage put into oscillation are derived and conditions for achieving oscillation by internal transformation of the filter stage are explored. Reconfiguration scheme based on the transformation of the biquad filter stage to a quadratic oscillator is studied. Theoretically the circuit can be put into oscillation by de-activating a single capacitor. Simulations, however, show that in practice a carefully designed low feed-back loop is required to achieve acceptable oscillation test mode.

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Acknowledgment

This work was supported by the Ministry of Higher Education, Science and Technology of the Republic of Slovenia under grant P2-0098.

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  1. Jožef Stefan Institute, Jamova 39, Ljubljana, Slovenia

    Uroš Kač & Franc Novak

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  1. Uroš Kač
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  2. Franc Novak
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Correspondence to Uroš Kač.

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Responsible Editor: M. Lubaszewski

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Kač, U., Novak, F. Oscillation Test Scheme of SC Biquad Filters Based on Internal Reconfiguration. J Electron Test 23, 485–495 (2007). https://doi.org/10.1007/s10836-007-5012-8

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  • DOI: https://doi.org/10.1007/s10836-007-5012-8

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