Analog-to-digital converter of the dual slope type

Details Analog-to-digital converter of the dual slope type Analog-to-digital converter of the dual slope type

1981-04-28

1983-09-13

Sloyan, T. J.

Communications: electrical

Audible indication

Percussion-type sound producer

340347AD, 340347CC, 340347M, 324 99D, H03K 1302

Patent

active

044045450

ABSTRACT:
Errors in determining a measured voltage are mathematically canceled in an analog-to-digital converter circuit useful for dual slope type using positive and negative values of a reference voltage. The errors are due to the off-set voltages inherent to operational amplifiers employed for an integrator and a comparator included within the analog-to-digital converter circuit. A counter circuit is provided for storing time information related to first and second dual slopes. A mathematical calculation is conducted with the aid of all the time information of the first and second dual slopes, whereby the measured voltage can be determined with eliminating the influence by the off-set voltage.

REFERENCES:
patent: 3836905 (1974-09-01), Cross
patent: 3872466 (1975-03-01), Wold
patent: 3942173 (1976-03-01), Wold
patent: 4122719 (1978-10-01), Carlson et al.
Schmid, Electronic Analog/Digital Conversions, Van Nostrand Reinhold Co., 1970, pp. 282-283.

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