LC tank clock driver with automatic tuning
US7126403B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 1, 2004 |
| Grant date | Oct 24, 2006 |
| Priority date | — |
| Expiry date | Nov 10, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03B2201/0266
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A new clock driver is described for the use in the phase detector of a clock and data recovery circuit (CDR). By building a resonant LC tank, whose center frequency is similar to the clock frequency, a low power clock driver is realized. A method based upon minimizing power consumption is described for determining the value of the programmable capacitance. A programmable capacitance adjusts the center frequency of the tank so it matches the frequency of the clock and a finite state machine at startup determines the value of this programmable capacitance. A criterion for tuning the center frequency of the tank is to choose the capacitance which leads to the lowest power consumption. A low Q tank affords a reasonable compromise between power efficiency and performance in the CDR circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.