Anti-noise circuits
US5049763A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 22, 1989 |
| Grant date | Sep 17, 1991 |
| Priority date | — |
| Expiry date | Mar 22, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K19/00361
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
Low noise circuits for single stage and multi-stage circuits reduce power rail noise, including both ground noise and supply noise caused by output power rail ground lead and supply lead inductance. Anti-bounce circuits reduce ground bounce by suppressing turn on of the output stage pulldown transistor element during transient occurrence of ground bounce events. Similarly anti-droop circuits reduce output supply V.sub.cc droop by suppressing turn on of the output stage pulldown transistor element during transient occurrence of V.sub.cc droop events. Anti-undershoot circuits dissipate ground undershoot energy by establishing a transient sacrificial current flow through the parasitic output ground tank circuit following transition from high to low potential at the output and by prolonging the sacrificial current flow during transient occurrence of ground undershoot events. Similarly anti-overshoot circuits dissipate overshoot energy in the parasitic output supply tank circuit by establishing a sacrificial current flow during transient occurence of V.sub.cc overshoot events. Ground noise and power noise detectors are used for detecting occurrence of bounce, droop, undershoot and overs…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.