Double integrating-type analog-to-digital converter

Details Double integrating-type analog-to-digital converter Double integrating-type analog-to-digital converter

1984-02-16

1986-10-28

Miska, Vit W.

Communications: electrical

Audible indication

Percussion-type sound producer

340347AD, 340347M, H03K 1302

Patent

active

046201785

ABSTRACT:
A double-integrating A/D converter in which an integrator output voltage, produced by integrating an analog signal input thereto, is reverse-integrated in accordance with a reference voltage having a polarity opposite to that of the analog signal. The time required for the reverse integration is measured in the form of a pulse count by means of a counter. A microcomputer for controlling the counter and a switch which selects the input to the integrator are provided with a software timer function so that the integrating interval of the analog input signal is set at will. The microcomputer also is capable of calculating a digital value, which corresponds to the analog signal, from a count recorded in the counter and from an overflow value indicated by an overflow signal generated by the counter. The signal converted by the A/D converter is capable of being applied to the weighing section of an electronic weigher.

REFERENCES:
patent: 4143724 (1979-03-01), Itani
patent: 4268820 (1981-05-01), Hareyama
patent: 4364028 (1982-12-01), Masuda et al.
patent: 4366468 (1982-12-01), Yoneyama
patent: 4404545 (1983-09-01), Nakanishi et al.

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