2002•Facta universitatis - series Electronics and EnergeticsOpen access

A comparative analysis of two gain- and offset-compensated switched-capacitor integrators

Nikolay Radev, Kantcho Ivanov

Abstract

Two high-performance switched-capacitor (SC) integrators which use different approaches for the compensation of the operational amplifier finite dc gain and offset voltage are considered. Analytical expressions for the gain, phase and offset voltage errors of the Baschirotto-90 integrator are derived and compared with the corresponding errors of the Shafeeu-91 integrator. Both the integrators are used as building blocks of a high-Q band pass SC biquad. The resultant filters are compared in terms of the percent deviations from the ideal case of the central frequency and the quality factor. Subsequently, the slight shift in the frequency response of the biquad with Shafeeu-91 integrator is eliminated by modifying the values of two capacitors .

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Key concepts: Digital biquad filter, Integrator, Switched capacitor, Op amp integrator, Operational amplifier, Capacitor, Control theory (sociology), Offset (computer science)