Integrated circuit filter with reduced die area
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United States of America Patent
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Aug 1, 1989
Issued Date -
N/A
app pub date -
Apr 28, 1988
filing date -
Sep 29, 1986
priority date (Note) -
Expired
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Abstract
An electronic filter which has particular application 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 resistors and capacitors selected for use in a filter constructed 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 underlying resistors from the deleterious effect of changes in voltage, and thus preventing the modulation of the resistance values of the resistors.
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