A/D and D/A converter using C-2C ladder network

Details A/D and D/A converter using C-2C ladder network A/D and D/A converter using C-2C ladder network

1975-06-10

1977-06-07

Sloyan, Thomas J.

Communications: electrical

Audible indication

Percussion-type sound producer

148188, 340347DA, H03K 1302

Patent

active

040286940

ABSTRACT:
A C-2C analog-to digital and digital-to-analog converter is described, the C-2C designation referring to the arrangement of capacitance in a capacitor ladder network. The capacitors are formed in a monolithic, multilayer structure which includes a substrate, diffusion regions in the substrate, a polysilicon layer and an aluminum layer wherein the capacitances are formed between the aluminum layer and the polysilicon layer and between the polysilicon layer and the diffusion region, and these capacitances have the ratio of 2C to C respectively. The capacitor ladder network formed in the multilayer structure can be trimmed or adjusted electrically after manufacture to obtain the desired tolerances.

REFERENCES:
patent: 3540037 (1970-11-01), Ottesen
patent: 3570114 (1971-03-01), Bean et al.
patent: 3665458 (1972-05-01), Mulkey et al.
patent: 3874955 (1975-04-01), Arita
Hoeschele, "Analog-to-Digital ------," J. Wiley & Sons, 1968, p. 190-194.

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