Waveshaping transversal filter and method utilizing the same for data transmission over coaxial cable
US5119326A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 6, 1989 |
| Grant date | Jun 2, 1992 |
| Priority date | — |
| Expiry date | Dec 6, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K2005/00097
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
The transversal filter has a plurality of variable delay lines each having multiple voltage controlled delay stages in series, with one of the variable delay lines having a clock input, and the other variable delay lines having data signal inputs. A phase comparator is coupled to the output of two non-adjacent stages of the variable delay lines having the clock input. A feedback circuit is coupled to the comparator and provides voltage signals to the voltage controlled delay stages of all of the variable dealy lines, such that adjacent stages in a particular delay line are delayed in time equal fractions of a clock cycle from each other, and so that all delay lines are running on the same clock. A voltage weighting circuit is provided for shaping the voltage outputs of the data signal variable delay lines and the weighting circuit is coupled to the delay line stages by switches which are activated when a data signal is propagated through a delay line stage. Where positive pulse, zero pulse, and negative pulse inputs are provided to the transversal filter along with a clock signal, and where the delay lines of the transversal filter have four or more active stages, a substantially r…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.