Tri-level capacitor structure in switched-capacitor filter

Details Tri-level capacitor structure in switched-capacitor filter Tri-level capacitor structure in switched-capacitor filter

1992-01-16

1993-06-15

Griffin, Donald A.

Electricity: electrical systems and devices

Electrostatic capacitors

Fixed capacitor

257528, H01G 410, H01L 2702

Patent

active

052204839

ABSTRACT:
A tri-level capacitor structure includes a first shielded metal layer (36) that is disposed between an upper metal layer (38) and a lower polysilicon layer (34). The shielded metal layer (36) is separated from the polysilicon layer (34) by an oxide layer (42), and the upper metal layer (38) is separated from the shielded layer (36) by an oxide layer (44). The upper metal layer (38) and the polysilicon layer (34) are connected together to a node (48) to form an Insensitive Node, whereas the shielded layer (36) is connected to a node (46) that is referred to as the Sensitive Node (S). The capacitor structure is operable to be connected in a switched-capacitor configuration in a lossy integrator, such that the Sensitive Node is connected to the virtual ground of a differential amplifier (50). The integrator utilizing this configuration would be comprised of at least one switched-capacitor (56) on the input that has the plates thereof connected between ground and either an input signal V.sub.IN or the inverting input of the differential amplifier (50) through control switches (62) and (64). The Sensitive Node associated with node (46) is connected to the switch (62) such that it is connected between ground and the inverting input of amplifier (50).

REFERENCES:
patent: 4849662 (1989-07-01), Holberg et al.
patent: 4949154 (1990-08-01), Haken
patent: 5032892 (1991-07-01), Chern et al.
patent: 5093774 (1992-03-01), Cobb
patent: 5110766 (1992-05-01), Maeda et al.
patent: 5116776 (1992-05-01), Chan et al.

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