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US 8,031,018 B2Granted
Oscillator with coupled amplifier
AssigneeRohde & Schwarz GmbH & Co. KG
InventorGerhard Kahmen
Life of this patent
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Abstract
An oscillator including a resonator with at least one first tuneable element, with which a resonant frequency of the resonator can be varied. The oscillator further includes an amplifier, which provides an amplification element, connected to the resonator at a coupling position. The amplifier provides a second tuneable element, by which a complex resistance, which the amplifier provides at the coupling position, is variable in a frequency-dependent manner.
Claims13
An oscillator comprising:
- a resonator with at least one first tuneable element, with which a resonant frequency of the resonator can be varied, and one supplementary capacitor selectively connectable in parallel, by a switching device, to the at least one first tuneable element;
- and
- an amplifier, which provides an amplification element, connected to the resonator at a coupling position,
- wherein the amplifier provides a second tuneable element, by which a complex resistance, which the amplifier provides at the coupling position, is variable in a frequency-dependent manner,
- wherein the first tuneable element is a varactor diode, and wherein, in the presence of low resonant frequencies of the resonator, the supplementary capacitor is connected in parallel to the varactor diode of the first tuneable element by the switching device, the first and second tuneable elements providing for a tuning range subdivided into two sub-bands.
2 more elements
Dependencies are inferred from the claim text.