Data converter for CT data acquisition system
US4815118A · kind A · utility
20Cited by
11References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 29, 1987 |
| Grant date | Mar 21, 1989 |
| Priority date | — |
| Expiry date | Jun 29, 2007 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03G3/00
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
Improved data converter circuitry for a CT data acquisition system is disclosed which makes use of a programmable gain amplifier whose gain is set according to the magnitude of a detector input signal by selecting one of several resistor voltage-divider paths at the input of a fixed gain amplifier. An auto-zero loop uses an intergrating op-amp to provide periodic correction to offset voltage of the fixed gain amplifier. In a modified embodiment, an auto-zero loop is provided for correction of both the fixed gain amplifier and a serially-connected A/D converter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.