A system for mitigating a crosstalk signal in the output signal of a first controlled oscillator resulting from crosstalk from a second controlled oscillator, the system comprising: a first phase-locked loop comprising the first controlled oscillator comprising a first resonant tank comprising an inductor and one or more capacitors (44, 46) and adapted to provide an output signal at a first frequency; a second phase-locked loop comprising the second controlled oscillator comprising a second resonant tank comprising an inductor and one or more capacitors and adapted to provide an output signal at a second frequency; and a compensation signal generator adapted to: generate a compensation signal at an offset frequency that is approximately equal to an offset between the first frequency and the second frequency; apply the compensation signal to the first controlled oscillator by switching a capacitor of the one or more capacitors (44, 46) in the first resonant tank of the first controlled oscillator such that the output signal of the first controlled oscillator is modulated by the compensation signal; wherein an amplitude and phase of the compensation signal are such that, when the compensation signal is applied to the first controlled oscillator, a crosstalk signal in the output signal of the first controlled oscillator resulting from crosstalk from the second controlled oscillator of the second phase locked loop to the first controlled oscillator of the first phase-locked loop is mitigated. a first phase-locked loop comprising the first controlled oscillator comprising a first resonant tank comprising an inductor and one or more capacitors (44, 46) and adapted to provide an output signal at a first frequency; a second phase-locked loop comprising the second controlled oscillator comprising a second resonant tank comprising an inductor and one or more capacitors and adapted to provide an output signal at a second frequency; and a compensation signal generator adapted to: generate a compensation signal at an offset frequency that is approximately equal to an offset between the first frequency and the second frequency; apply the compensation signal to the first controlled oscillator by switching a capacitor of the one or more capacitors (44, 46) in the first resonant tank of the first controlled oscillator such that the output signal of the first controlled oscillator is modulated by the compensation signal; generate a compensation signal at an offset frequency that is approximately equal to an offset between the first frequency and the second frequency; apply the compensation signal to the first controlled oscillator by switching a capacitor of the one or more capacitors (44, 46) in the first resonant tank of the first controlled oscillator such that the output signal of the first controlled oscillator is modulated by the compensation signal; wherein an amplitude and phase of the compensation signal are such that, when the compensation signal is applied to the first controlled oscillator, a crosstalk signal in the output signal of the first controlled oscillator resulting from crosstalk from the second controlled oscillator of the second phase locked loop to the first controlled oscillator of the first phase-locked loop is mitigated.