A method and device for continuous-time filtering in digital...

H - Electricity – 03 – F

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H03F 3/45 (2006.01) H03F 3/345 (2006.01) H03H 11/04 (2006.01)

Patent

CA 2260915

In a digital CMOS process neither resistors nor linear capacitors are available and it is not possible or simply not practical to design continuous- time filters using traditional methods. It has therefore been proposed to utilize current mirrors to realize filtering functions in a voltage-to-current converter when designing continuous-time filters for sampled data systems in digital CMOS processes. The pole frequency is therefore determined by the transconductance of an MOS transistor (6) and the capacitance of a capacitor (8) seen at its gate. In this application, a generalized method of designing continuous-time filters in digital CMOS process and methods of cascading have been proposed to reduce the spread of the pole frequencies.

En technologie CMOS numérique, on ne peut utiliser ni les résistances ni les condensateurs linéaires et il est impossible ou tout simplement malaisé de concevoir des filtres à temps continu en faisant appel aux méthodes classiques. L'idée a donc été émise d'utiliser des miroirs de courant pour effectuer des filtrages dans un convertisseur tension-courant en concevant des filtres à temps continu pour des systèmes de données échantillonnés dans le cadre d'une technologie CMOS numérique. On détermine donc la fréquence d'un pôle au moyen de la transconductance d'un transistor à effet de champ métal-oxyde semi-conducteur (MOS) (6) et de la capacité d'un condensateur (8) mesurée à la grille du transistor. Il est décrit, au titre de cette invention, un procédé général de conception de filtres à temps continu dans le cadre d'une technologie CMOS ainsi que des techniques de cascadage afin de réduire l'étalement des fréquences d'un pôle.

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