A-to-D converter of the successive-approximation type

Details A-to-D converter of the successive-approximation type A-to-D converter of the successive-approximation type

1987-09-22

1988-08-02

Sloyan, T. J.

Communications: electrical

Audible indication

Percussion-type sound producer

307303, 307318, 340347M, 340347LL, 323313, 323281, 323907, H03M 138

Patent

active

047616369

ABSTRACT:
An integrated-circuit analog-to-digital converter of the successive-approximation type formed on a single monolithic chip. The converter is made by a diffusion process wherein certain portions of the chip are formed with normal-mode linear transistors, and other portions are formed with inverted mode I.sup.2 L transistors. The normal-mode transistors provide a switchable current-source DAC, a set of three-state output buffers, and a comparator. The inverted mode transistors provide an internal clock and successive-approximation control circuitry for the DAC. The chip also includes a voltage reference to provide for absolute analog-to-digital conversions.

REFERENCES:
patent: 4013901 (1977-03-01), Williams
patent: 4176344 (1979-11-01), Saari et al.
Schmid, Electronic Analog/Digital Conversions, Van Nostrand Reinhold Co., 1970, pp. 240-247.

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