One example discloses a data processing device, comprising: a local oscillator (LO) having an LO frequency output, an LO performance parameter output, and an LO frequency select input; and a degradation detection module, coupled to the LO performance parameter output and to the LO frequency select input, and including an LO frequency select module triggered by the LO performance parameter output. Another example discloses an article of manufacture comprises at least one non-transitory, tangible machine readable storage medium containing executable machine instructions for controlling a data processing device which comprise: monitoring a set of local oscillator (LO) performance parameters; setting an LO degraded state when at least one of the LO performance parameters is not within a predetermined range; and adjusting an LO frequency in response to the LO degraded state.