Method and apparatus for automatic equalization of very high frequency multilevel and baseband codes using a high speed analog decision feedback equalizer
US6047026A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 30, 1997 |
| Grant date | Apr 4, 2000 |
| Priority date | — |
| Expiry date | Sep 30, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2025/0349
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A decision feedback equalizer circuit employing a current mode finite impulse response (FIR) filter. A decision feedback equalizer circuit comprises an attenuator block for scaling a received voltage signal, a first transconductor (voltage-to-current converter) for converting the received voltage signal to a current signal, a current mode finite impulse response (FIR) filter for adding or subtracting current increments from the current signal and generating an equalized current signal, a second transconductor (current-to-voltage converter) for converting the equalized current signal into an equalized voltage signal, a positive slicer block for determining when the equalized voltage signal achieves a positive threshold level, a negative slicer block for determining when the equalized voltage signal achieves a negative threshold level, and a plurality of delay lines coupled respectively to the slicer blocks and to the current mode FIR filter for providing tap enable signals to the current mode FIR filter in response to signals received from the slicers. The decision feedback equalizer circuit may further comprise a baseline wander correction block for providing a correction current t…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.