Analog/digital converter
US4590459A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 14, 1985 |
| Grant date | May 20, 1986 |
| Priority date | — |
| Expiry date | May 14, 2005 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M1/504
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A digital integrator (1) having a 16-bit output is followed by a first 12-bit digital/analog converter (2a) which is supplied with the output bits 1-11 and 16 of the integrator (1) and which forms a first tracking loop with a first subtracter (3a), which forms a first difference signal from the output signal, proportional to the input signal of the analog/digital converter, of a first amplifier (4a) and the output signal of the first digital/analog converter (2a), and a tracking circuit (6) which generates tracking signals for the integrator (1) on the basis of the difference signal. To extend the dynamic range, a second 12-bit digital/analog converter (2b) is present which is supplied with bits 5-16 from the output of the integrator and which forms a second tracking loop with a second subtractor (3b) and a second amplifier (4b), the gain factor of which is 1/16th of the gain factor of the first amplifier (4a), to which loop a control logic (15) switches over when the range which can be covered with the first digital/analog converter (2a) is exceeded. Switching back takes place at the next zero crossing, that is to say change of the most significant bit. The digital/analog converte…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.