Ring oscillator having a stable output signal without influence of MOS devices
US6809603B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 29, 2003 |
| Grant date | Oct 26, 2004 |
| Priority date | — |
| Expiry date | Apr 29, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K3/0315
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A ring oscillator having a stable output signal without influence of MOS devices is disclosed. The ring-oscillator has a bias circuit to drive a plurality of delay cells. The bias circuit has a first loading unit with a p-n junction, a second loading unit with a p-n junction, and a resistor electrically connected to the p-n junction of the second loading unit. The second loading unit and the resistor are positioned at a current path of a current mirror, and the first loading unit is positioned at another current path of the current mirror. The area of the p-n junction in the second loading unit is not equal to the area of the p-n junction in the first loading unit. The magnitudes of the current passing on the two current paths are only controlled by characteristics of the p-n junctions of the first and second loading units.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.