Mixed technology mems/bicmos lc bandpass sigma-delta for...

H - Electricity – 03 – M

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H03M 3/02 (2006.01)

Patent

CA 2502451

An improved sigma-delta modulator is disclosed. The sigma-delta modulator (100) utilizes Micro Electro Mechanical System (MEMS) technology coupled with on-chip LC networks (110,118). MEMS switches are used to switch capacitors and inductors in and out of the network to alter the center frequency and tuning range of the sigma-delta modualtor (100), thus eliminating active components in each LC network (110,118). Furthermore, the use of MEMS switches improves the Q of each LC network (110,118) relative to previous on-chip sigma-delta modualtor designs. The increased Q of each LC network (110,118) reduces or eliminates the need for active Q-enhancement circuitry and improves the inherent filter shape within the loop of the sigma-delta modulator (100). In addition, the distortion of active compoenmtns with the loops (146,146', 148, 148') of the sigma-delta modulator (100) also is improved. The addition of a decimator 252 to the chip presents a complete single chip LC sigma-delta analog-to-digital converter 250.

L'invention porte sur un modulateur sigma-delta amélioré (100) qui utilise une technologie MEMS (système microélectromécanique) couplée à des cellules LC sur puce (110,118). Des commutateurs MEMS sont utilisés pour mettre en circuit et hors circuit des condensateurs et des inducteurs de la cellule afin de modifier la fréquence centrale et la plage d'accord du modulateur sigma-delta (100), ce qui élimine des composants actifs dans chaque cellule LC (110,118). De plus, l'utilisation de commutateurs MEMS améliore le Q de chaque cellule LC (110,118) par rapport aux types précédents de modulateurs sigma-delta sur puce. Le Q accru de chaque cellule LC (110,118) réduit ou élimine le besoin de circuits actifs de mise en valeur de Q et améliore la forme inhérente du filtre dans la boucle du modulateur sigma-delta (100). De plus, la distorsion des composants actifs par les boucles (146,146', 148, 148') du modulateur sigma-delta (100) est également améliorée. L'ajout d'un décimateur (252) à la puce permet d'obtenir un numériseur sigma-delta LC à puce unique complet (250).

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