Semiconductor integrated circuit device for communication
US7647033B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 24, 2007 |
| Grant date | Jan 12, 2010 |
| Priority date | — |
| Expiry date | Jun 25, 2028 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03L7/07
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A level converter level-converts an oscillation output signal of a reference frequency oscillator and supplies the level-converted signal to a phase comparator of a PLL/fractional synthesizer for controlling an oscillation frequency of an RF transmission voltage-controlled oscillator. The level converter includes a self-bias type voltage amplifier which amplifies a reference frequency signal of the reference frequency oscillator. The self-bias type voltage amplifier includes a coupling capacitor, an amplifying transistor, a load and a bias element and suppresses a variation in the level of each harmonic component even though an external power supply voltage varies.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.