IEEE Journal of Solid-State Circuits · 1992 · 102 citations · 13 references
EngineeringElectrical EngineeringAnalog ElectronicsMicroelectronicsVlsi DesignActive FiltersAnalog FiltersAnalog Integrated CircuitsCmos Circuit DesignMixed-signal Integrated Circuit DesignActive Rc FiltersContinuous-time FiltersCutoff FrequencyDynamic RangeFilter CircuitsFilter DesignFiltersTunable Filters
High-linearity self-tuning continuous-time filters, fabricated in a standard 1.6- mu m 5-V CMOS process, are presented. Frequency control is achieved using switchable arrays of highly linear double-polysilicon capacitors in an active RC filter structure, resulting in tunable filters with very low signal distortion. One filter, a Tow-Thomas biquad, exhibits dynamic range and signal linearity of typically 91 dB. Another smaller implementation, a Sallen and Key filter, attains >or=76 dB. Cutoff frequency response is maintained to an accuracy of around +or-5%.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">></ETX>
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