Voltage controlled oscillator having reduced phase noise
US8102216B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | May 6, 2009 |
| Grant date | Jan 24, 2012 |
| Priority date | — |
| Expiry date | Jul 28, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03B5/1228
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A VCO comprises an LC tank circuit coupled to a plurality of cross-coupled transistor devices. A first resonance frequency of a waveform output of the VCO is dependent upon the values of a first capacitor and a first inductor of the LC tank. The VCO further comprises a first series LC resonator comprising a second capacitor and a second inductor in parallel to the first capacitor and the first inductor. The values of the second capacitor and second inductor are selected to produce a second resonance frequency that is a third harmonic of the first resonance frequency, thereby increasing a slope of the voltage controlled oscillator output. The increased slope reduces phase noise, which leads to improved signal-to-noise ratio.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.