High-ratio-accuracy capacitor geometries for integrated circuits

Details High-ratio-accuracy capacitor geometries for integrated circuits High-ratio-accuracy capacitor geometries for integrated circuits

1978-09-29

1980-07-01

Goldberg, E. A.

Electricity: electrical systems and devices

Electrostatic capacitors

Fixed capacitor

357 51, 361303, H01G 438

Patent

active

042109507

ABSTRACT:
A number of known circuit configurations require high-ratio-accuracy capacitors. Maintaining such ratios during the various processing steps involved in fabricating the configurations in integrated-circuit form has been found to be difficult. In accordance with this invention, ratio capacitors are made in integrated-circuit form utilizing a unique geometry. In one specific embodiment, a so-called H-section geometry that is largely insensitive to processing variations is utilized to form the capacitors. In this way, high-yield low-parasitic precisely matched pairs of ratio capacitors are achieved.

REFERENCES:
patent: 2493199 (1950-01-01), Khouri
patent: 2694185 (1954-11-01), Kodama
patent: 3273033 (1966-09-01), Rossmeisl
patent: 3519901 (1970-07-01), Bean
patent: 3644802 (1972-02-01), Dingwall
"All MOS Charge Redistribution Analog to Dig. Conversion", pp. 371-379 in Journal of Solid State Circuits, vol. SC10 #6, 12/75.
"Analog Sample Data Filters", pp. 302-304, IEEE Journal Solid State Circuits, vol. SC7 #4, 8/72.

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