Implementing compact current mode logic (CML) inductor capacitor (LC) voltage controlled oscillator (VCO) for high-speed data communications
US8994460B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 13, 2012 |
| Grant date | Mar 31, 2015 |
| Priority date | — |
| Expiry date | Sep 19, 2033 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03L7/085
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A method and a phase locked loop (PLL) circuit for implementing compact current mode logic inductor capacitor voltage controlled oscillator for high speed communications, and a design structure on which the subject circuit resides are provided. The PLL circuit includes a current mode logic (CML) inductor capacitor (LC) Voltage Controlled Oscillator (VCO). The PLL circuit includes a reference circuit generates a virtual ground node for biasing noise sensitive components, providing level shifted VCO increment and decrement tuning values from a phase detector coupled by a respective resistor to tune a varactor of the LC VCO, and providing a loop filter function. The virtual ground node tracks a logic power supply noise, incurring no jitter penalty, and eliminating the need for a separate power supply for the PLL circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.