Impedance adjustment circuits and methods using replicas of variable impedance circuits
US7295033B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 11, 2005 |
| Grant date | Nov 13, 2007 |
| Priority date | — |
| Expiry date | Feb 11, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L25/0278
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
An impedance adjustment circuit for controlling an impedance of a variable impedance circuit includes a calibration circuit including a replica of the variable impedance circuit and configured to generate an impedance control signal for the variable impedance circuit based on a voltage generated at the replica of the variable impedance circuit in response to a reference current. The calibration circuit may be configured to generate the reference current based on a reference resistor coupled thereto. In particular, the calibration circuit may be configured to match a current in the replica of the variable impedance circuit and a current in the reference resistor to generate the voltage at the replica of the variable impedance circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.