Highly-Linear Canonical MOSFET-Capacitor Filters

Shigetaka TAKAGI  Nobuo FUJII  Takeshi YANAGISAWA  

IEICE TRANSACTIONS (1976-1990)   Vol.E71   No.6   pp.562-566
Publication Date: 1988/06/25
Online ISSN: 
Print ISSN: 0000-0000
Type of Manuscript: PAPER
Category: Analog Signal Processing

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Continuous-time MOSFET-capacitor filters have quite a serious problem, that is, MOS transistors' nonlinearity drastically reduces the filters' dynamic ranges. Czarnul proposed an MOS resistive circuit with high degree of linearity and solved this problem. The method, however, requires two capacitors for each integrator. Consequently, the chip area and manufacturing cost will increase. This paper proposes a new single capacitor integrator which can cancel the nonlinearity of transistors. The integrator is applied to a canonical continuous-time filter synthesis with high linearity. A total harmonic distortion less than 0.33% is obtained by SPICE analysis.