Phase locked loop with startup oscillator and primary oscillator
US8237513B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 23, 2010 |
| Grant date | Aug 7, 2012 |
| Priority date | — |
| Expiry date | Sep 14, 2030 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03L3/00
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A voltage controlled oscillator (VCO) for a phase locked loop (PLL) includes a startup oscillator, the startup oscillator comprising a first plurality of inverters; a primary oscillator, the primary oscillator comprising a second plurality of inverters, wherein a number of the second plurality of inverters is fewer than the number of the first plurality of inverters; and a control module connected to the startup oscillator and the primary oscillator. A method of operating a voltage controlled oscillator (VCO) in a phase locked loop (PLL), the VCO comprising a startup oscillator and a primary oscillator includes sending an enable signal to the startup oscillator; waiting a predetermined number of startup oscillator clock cycles; and when the predetermined number of startup oscillator clock cycles has elapsed, sending a disable signal to the startup oscillator, and sending an enable signal to the primary oscillator.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.