An oscillator (50, 80, 90, 100, 110) for use in generating a signal having a desired frequency in a frequency synthesizer, characterized by: a first inductor element being electrically coupled from one end of a first capacitive element (C 1) to a first voltage connection point (V DC1), configured to receive first supply voltage; a second inductor element being electrically coupled from one end of a second capacitive element (C 2) to a second voltage connection point (V DC2), configured to receive a second supply voltage; a third inductor element being electrically coupled from the other end of the first capacitive element (C 1) to the first voltage connection point (V DC1); a fourth inductor element being electrically coupled from the other end of the second capacitive element (C 2) to the second voltage connection point (V DC2), characterised in that said inductor elements (51A, 51B, 51C, 51D) being arranged such that a conductive trace loop formed by the first and third inductor elements (51A, 51C) is interleaved with a conductive trace loop formed by the second and fourth inductor elements (51B, 51D) thereby forming parallel tracks with mutual inductance, wherein a first drive circuit, comprising a cross-coupled differential pair of transistors arranged to generate a negative resistance component, is electrically coupled to the first inductor element substantially halfway between the first capacitive element (C 1) and the first voltage connection point (V DC1), and said first drive circuit is electrically coupled to the second inductor element substantially halfway between the second capacitive element (C 2) and the second voltage connection point (V DC2), and a second drive circuit, comprising a cross-coupled differential pair of transistors arranged to generate a negative resistance component, is electrically coupled to the third inductor element substantially halfway between the first capacitive element (C 1) and the first voltage connection point (V DC1), and said second drive circuit is electrically coupled to the fourth inductor element substantially halfway between the second capacitive element (C 2) and the second voltage connection point (V DC2). a first inductor element being electrically coupled from one end of a first capacitive element (C 1) to a first voltage connection point (V DC1), configured to receive first supply voltage; a second inductor element being electrically coupled from one end of a second capacitive element (C 2) to a second voltage connection point (V DC2), configured to receive a second supply voltage; a third inductor element being electrically coupled from the other end of the first capacitive element (C 1) to the first voltage connection point (V DC1); a fourth inductor element being electrically coupled from the other end of the second capacitive element (C 2) to the second voltage connection point (V DC2), characterised in that said inductor elements (51A, 51B, 51C, 51D) being arranged such that a conductive trace loop formed by the first and third inductor elements (51A, 51C) is interleaved with a conductive trace loop formed by the second and fourth inductor elements (51B, 51D) thereby forming parallel tracks with mutual inductance, wherein a first drive circuit, comprising a cross-coupled differential pair of transistors arranged to generate a negative resistance component, is electrically coupled to the first inductor element substantially halfway between the first capacitive element (C 1) and the first voltage connection point (V DC1), and said first drive circuit is electrically coupled to the second inductor element substantially halfway between the second capacitive element (C 2) and the second voltage connection point (V DC2), and a second drive circuit, comprising a cross-coupled differential pair of transistors arranged to generate a negative resistance component, is electrically coupled to the third inductor element substantially halfway between the first capacitive element (C 1) and the first voltage connection point (V DC1), and said second drive circuit is electrically coupled to the fourth inductor element substantially halfway between the second capacitive element (C 2) and the second voltage connection point (V DC2).