Voltage-controlled oscillator and electronic device using same
US6933794B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 13, 2003 |
| Grant date | Aug 23, 2005 |
| Priority date | — |
| Expiry date | Feb 23, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03B5/326
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A voltage-controlled oscillator includes a voltage-controlled phase-shift circuit for outputting a signal in which the phase of an input signal is shifted by a predetermined amount in accordance with an external control voltage; a plurality of SAW resonators, each of which resonates at a predetermined resonance frequency; switching means for selecting one of the plurality of SAW resonators in accordance with the external control signal; frequency selection means for selecting a predetermined resonance frequency from the selected SAW resonator; an oscillation differential amplifier for amplifying the resonance signal of the predetermined resonance frequency; and a feedback-buffer differential amplifier for inputting the output signal from the oscillation differential amplifier, wherein the voltage-controlled phase-shift circuit, the selected SAW resonator, the frequency selection means, the oscillation differential amplifier, and the feedback-buffer differential amplifier form a positive-feedback oscillation loop.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.