A canonical continuous-time MOSFET-capacitor filter with high linearity

The authors propose a synthesis of fully integrated canonical continuous-time filters with a high degree of linearity. The synthesis method is based on a differential current-integrator with a simple capacitor. A method to reduce the number of MOS transistors has also been presented. A third-order leapfrog filter is realized by the proposed method as an example. A total harmonic distortion less than 0.03% is obtained by SPICE analysis. The proposed method is advantageous, especially in the realization of higher-order filters, because of the reduction of higher-order filters, because of the reduction in chip area and manufacturing cost.<
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