Abstract: Embodiments of the present invention relate to a self injection locked voltage controlled oscillator arrangement, a pair of coupled first and second voltage controlled oscillator devices are arranged on a chip, an amplifier device is arranged on the same of the refection type chip, and an off-chip delay line is arranged with one terminal connected to an output terminal of the coupled first and second voltage controlled oscillator devices, and on terminal adapted to reflect a signal from the output terminal, the amplifier device being arranged to amplify an injection signal from said output terminal and to supply the amplified injection signal to one of said first and second voltage controlled oscillation devices to provide a VCO arrangement that exhibits low phase noise and a small size.

Abstract: The invention discloses a tuneable resonator (100, 200, 300, 500, 600, 700, 900) with a substrate layer (140, 260, 360, 560, 660, 960), which substrate layer supports a structure with a first electrode (130, 240, 350, 550, 650). In connection to the first electrode there is arranged a layer (120, 230, 330, 530, 630, 930) of a material which can be brought to resonate. The resonator further comprises a second electrode (110, 210, 310, 510, 610, 710, 910) arranged in connection to said material which can be brought to resonate, and the material which can be brought to resonate is a ferroelectric material. The ferroelectric material is brought into resonance by applying an electrical field (DC, AC) between the first and the second electrode, the tuning being achieved by varying the electrical field.