Signal conversion using coarse and fine digital to analog converters
US6549155B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 30, 2002 |
| Grant date | Apr 15, 2003 |
| Priority date | — |
| Expiry date | Jan 30, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M1/0863
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
Signal conversion apparatus and method with coarse and fine digital to analog converters. The output of the coarse DAC has a high gain to support wide voltage swings, while the fine DAC has a low gain to support accurate tracking control. The two outputs are combined in an analog summing junction. The apparatus and method may comprise a low pass filter connected to the coarse DAC output. The filter may be switched off during large changes to provide rapid system response, and switched on during position holding to attenuate noise from the coarse DAC. The apparatus and method may comprise a pre-charging capacitor in the filter, wherein the capacitor may be pre-charged when the filter is off, reducing the switch transient when the filter is switched on.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.