Compensated capacitors for switched capacitor input of an analog

Details Compensated capacitors for switched capacitor input of an analog Compensated capacitors for switched capacitor input of an analog

1988-10-13

1990-04-17

Shoop, Jr., William M.

Coded data generation or conversion

Analog to or from digital conversion

Analog to digital conversion

341150, 361303, H03M 100

Patent

active

049184547

ABSTRACT:
A semiconductor capacitor for use in an analog-to-digital converter includes two parallel connected capacitors with separate lower plates (44) and (46) fabricated of polycrystalline silicon and upper plates (52) and (54) also fabricated of polysilicon. The plates are separated by capacitive oxide dielectric structures (48) and (50). They are interconnected such that the lower plate (44) of one capacitor is connected to the upper plate (54) of the other capacitor and the lower plate (46) of the other capacitor is connected to the upper plate (52) of the first capacitor. With such a configuration, the odd ordered non-linearities contributing to the voltage coefficient errors are cancelled.

REFERENCES:
patent: 4144526 (1979-03-01), Wotruba
patent: 4194187 (1980-03-01), Glendinning
patent: 4716580 (1987-12-01), Berger
patent: 4731696 (1988-03-01), Himes et al.

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