Variable equalizer with independently controlled branches based on different frequency breakpoints
US6549087B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 12, 1999 |
| Grant date | Apr 15, 2003 |
| Priority date | — |
| Expiry date | Jan 12, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B3/145
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
Avariable equalizer is described. The variable equalizer provides for independent control of a number of breakpoints in the frequency response of the equalizer so as to allow the equalizer to be readily tuned to compensate for the tilt of coaxial cables over a wide range of characteristic attenuation. In one embodiment, the variable equalizer includes a two port bridge “T” network with variable top and bottom branches that are independently and selectively adjusted to create a desired frequency response. For example, in one embodiment, the top branches include a number of variable RC networks and the bottom branches include a number of variable LR networks. In some embodiments, PEN diodes provide the variable resistance in these LR and RC networks.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.