Integrated circuit filter with reduced die area

Details Integrated circuit filter with reduced die area Integrated circuit filter with reduced die area

H - Electricity

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H01L 27/04 (2006.01) H01L 27/06 (2006.01) H01L 27/07 (2006.01) H03H 11/12 (2006.01)

Patent

CA 1228175

INTEGRATED CIRCUIT FILTER WITH REDUCED DIE AREA Yusuf A. Haque ABSTRACT An electronic filter which has particular appli- cation for use as an antialiasing filter in sampled data systems fabricated so as to utilize high resistivity diffused regions (36, 37) within the semiconductor body (31), as opposed to low resistivity polycrystalline silicon resistors. Furthermore, the values of the resis- tors and capacitors selected for use in a filter con- structed in accordance with this invention are such that the high resistivity resistors require a small amount of space, and are physically located beneath the capacitors (33, 34, 35) used in the filter of this invention. The lower plate (33) of the capacitor is connected to a fixed voltage potential, thereby in effect shielding the under- lying resistors from the deleterious effect of changes in voltage, and thus preventing the modulation of the resis- tance values of the resistors.

481462

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