MOS varactor and voltage-controlled oscillator using the same
US7369008B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 27, 2006 |
| Grant date | May 6, 2008 |
| Priority date | — |
| Expiry date | Jun 25, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03B5/368
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
To provide a MOS varactor in which oscillation frequency variation is small and variation in a capacitance changing voltage is small, and a voltage-controlled oscillator using the MOS varactor, as a load capacitor of an oscillating circuit composed of a feedback resistor 1, an amplifier 2, and a crystal vibrator 3, a variable electrostatic capacitor, which is generated between drain/source terminals and a gate terminal of each of MOS transistors 5a and 6a each of which source and drain terminals are short-circuited, is connected. A bulk terminal of each of the MOS transistors 5a and 6a is connected to one terminal of a resistor 19, a voltage is applied to the other terminal of the resistor 19, the bulk terminal of each of the MOS transistors 5a and 6a is connected to one terminal of a capacitor 20, and the other terminal of the capacitor 20 is grounded.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.