CML delay cell with linear rail-to-rail tuning range and constant output swing
US7541855B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 21, 2008 |
| Grant date | Jun 2, 2009 |
| Priority date | — |
| Expiry date | May 21, 2028 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K2005/00208
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A current mode logic (CML) delay cell with linear rail-to-rail tuning range and constant output swing. The CML delay cell can include a tuning voltage input on a first and second transistor, contributing to a CML delay cell load, and a bias voltage input on a third transistor, as a current source I0, and a compensation circuit having switching point optimized inverters having a first plurality of transistors having a transconductance βpN and a second plurality of transistors having a transconductance βnN, wherein respective ratios of βnN/βpN determine an inverter switching point of respective switching point optimized inverters, the first and second plurality of transistors having gates coupled to the tuning voltage input of the CML delay cell, wherein the switching point optimized inverters are followed by weighted tail current sources M0N that supply additional currents to the current source I0 at a drain node of the third transistor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.