Apparatus and methods for phase-locked loops
US8664991B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Feb 25, 2013 |
| Grant date | Mar 4, 2014 |
| Priority date | — |
| Expiry date | Feb 25, 2033 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03L2207/06
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
Apparatus and methods for phase-locked loops (PLLs) are provided. In certain implementations, a PLL includes a voltage controlled oscillator (VCO) including first and second frequency control circuits, which are coupled to first and second frequency control inputs, respectively. Additionally, the PLL can further include a loop filter, a high frequency pole circuit, and a low frequency pole circuit. The high frequency pole circuit can be electrically connected between the loop filter's output and the VCO's first frequency control input, and the low frequency pole circuit can be electrically connected between the loop filter's output and the VCO's second frequency control input.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.