非理想素子特性を考慮したUGB型SCフィルタの設計

概要

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Switched-capacitor (SC) filters comprise capacitors inter connected by periodcally operated switches. Such filters are particularly attractive in the light of the high density circuit achieved by the MOS LSI technology. For high-frequency and high-precision applications, however, the nonideal effects of components have to be taken into account, with actual IC fabrication processes. This paper describes a implementation of high-frequency switched-capacitor filter using unity-gain buffers (UGB). First, equations and approximate transfer functions for inverting and noninverting integrators are driven, which take account of the combined influence of the amplifier finite gain and the finite bandwidth and of nonzero on-resistance of switch. Then, we present the approximate transfer function and the analysis of some deviation from its ideal behavior, for a new biquad implementation with UGB. Finally we propose a design method for SC bandpass filters regarded as the nonideal OP-AMPs and switches without using any complementary element. Our experimental result shows that this method is applicable to high-frequency SC filters.
東海大学の論文