Analogue to digital converter
USRE28833E · kind E · reissue
Assignee
Inventor
Key dates
| Filing date | May 23, 1975 |
| Grant date | May 25, 1976 |
| Priority date | — |
| Expiry date | May 23, 1995 |
Classification
- Technology area (CPC —)General
Abstract
In an analogue to digital converter the unknown voltage is applied continuously to an integrating circuit during each conversion period. An opposing reference voltage is switched on and off to cause the amplifier output to ramp up and down between two detection levels. One or both of these levels varies as a periodic function of time, e.g. a sawtooth waveform. Clock pulses are counted when the slope of the output ramp is of one sign only and it is shown that the ratio of the unknown voltage to the reference voltage is simply related to the number of clock pulses actually counted when the slope is of said one sign and the total number of clock pulses occurring during the conversion period.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.