Token ring equalizer
US5132926A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 21, 1990 |
| Grant date | Jul 21, 1992 |
| Priority date | — |
| Expiry date | Sep 21, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L12/433
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
An improved local area network ring node of the type described in ANSI/IEEE Standard 802.5, including a receiver having an input connectable to the ring, a phase-locked loop circuit for extracting a clock frequency from the receiver output and including a phase detector for generating a phase error signal, and a data demodulator connected for demodulating at the extracted clock frequency the data in the receiver output. The improvement lies in the provision of a filter for deriving a control signal from the outputs of the data demodulator and the phase detector and an adaptive equalizer for reducing the effect of jitter in signals applied to the receiver input from the network, the equalizer comprising a filter network including a voltage variable impedance so connected as to vary responsively to the control signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.