Integrated semiconductor circuit

Details Integrated semiconductor circuit Integrated semiconductor circuit

1985-12-26

1987-08-11

Miller, Charles D.

Communications: electrical

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Percussion-type sound producer

H03M 118

Patent

active

046865071

ABSTRACT:
An integrated semiconductor circuit which contains both a microprocessor as well as an analog-to-digital converter. Two D/A converters are allocated to an A/D converter. One of the D/A converters generates a internal base potential from an externally supplied fixed base potential and an externally supplied fixed reference potential under the direction of the microprocessor. The other one generates a internal reference potential from the two external potentials. The two internal potentials form the reference voltage which serves for the A/D conversion according to the principle of successive approximation. By so doing, the same circuit can be controlled by measuring points having different voltage ranges without the converter having to be provided with additional comparison stages. These are involved in comparison to the A/D conversion to be applied and serve the purpose of increasing the resolution.

REFERENCES:
patent: 3626408 (1971-12-01), Carbrey
patent: 4200863 (1980-04-01), Hodges
patent: 4295089 (1981-10-01), Cooperman
patent: 4451821 (1984-05-01), Domogalla
Biensman "1980 IEEE International Solid-State Circuits Conference Digest of Technical Papers" Feb. 1980, pp. 16-17.
"PALs: Programmable Logic Functions Help Minimize Hardware" from PAL Programmable Array Logic Handbook, Third Edition, pp. 8-8 through 8-13, John Birkner/Wescon, 1979.
8172 IEEE Int.-Solid State Circuits Conf. (1980) Feb., New York, Session I: A/D and D/A Conveters, pp. 16 and 17.

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