Integrated circuit filter with reduced die area

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

1988-04-28

1989-08-01

James, Andrew J.

Boots, shoes, and leggings

357 54, 357 14, 357 4, 36472403, 333172, H01L 2702

Patent

active

048537594

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.

REFERENCES:
patent: 3256588 (1966-06-01), Sikina et al.
patent: 3806839 (1974-04-01), Iwakami
patent: 4263518 (1981-04-01), Ballatore et al.
patent: 4366455 (1982-12-01), Berger
patent: 4399417 (1983-08-01), Ballantyne et al.
patent: 4442500 (1984-04-01), Kongable et al.
D. Johnson and J. Hilburn, "Rapid Practical Designs of Active Filters," John Wiley & Sons, pp. 12, 13 and 26-29 (1984) New York.
J. K. Howard, "Dual Dielectric Capacitor", IBM Technical Disclosure Bulletin, vol. 23, No. 3, Aug. 1980, p. 1058.

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