Current steering digital to analog converter with improved dynamic linearity
US7023367B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 10, 2005 |
| Grant date | Apr 4, 2006 |
| Priority date | — |
| Expiry date | Mar 10, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M1/742
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A current source cell includes a current source providing a first current at a first node where variations of a first voltage at the first node results in variations of the first current, and first and second switches coupled between the first node and respective first and second output terminals. A control signal is coupled to selectively apply a first drive voltage to a selected one of the first and second switches to close the selected switch to steer the first current to the corresponding output terminal. The current source cell further includes a voltage adjustment circuit coupled to detect variations in the first voltage and vary the first drive voltage in response to the variations in the first voltage. The first drive voltage applied to the selected switch is varied to reduce the variations in the first voltage, thereby maintaining the first voltage at a substantially stable voltage value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.