Logarithmic analog-to-digital converter
US4350974A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 15, 1980 |
| Grant date | Sep 21, 1982 |
| Priority date | — |
| Expiry date | Apr 15, 2000 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M1/46
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A logarithmic analog-to-digital converter which provides a digital representation of the logarithm of the ratio of an input voltage and a reference voltage. The converter determines the ouptut via a successive approximation technique. The input voltage is amplified by selected ones from among a plurality of exponentially related gains; and the reference voltage is attenuated by selected ones of a set of exponentially related attenuation factors. The amplified input signal and the attenuated reference signal are compared, and the results of this comparison for a series of attenuations and/or amplification factors produces the desired logarithmic representation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.