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Highly-Linear Canonical MOSFET-Capacitor Filters
Shigetaka TAKAGI Nobuo FUJII Takeshi YANAGISAWA
IEICE TRANSACTIONS (1976-1990)
Publication Date: 1988/06/25
Print ISSN: 0000-0000
Type of Manuscript: PAPER
Category: Analog Signal Processing
Full Text: PDF>>
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.