Abstract: The present invention relates to a crystal-free oscillator circuit (100) for channel-based high-frequency radio communication, the crystal-free oscillator circuit (100) comprising a crystal-free oscillator element (120) configured to provide a high-frequency reference signal (101), the high-frequency reference signal (101) having a frequency of at least about 1 GHz, and a phase-locked loop (PLL) circuit (110) having a feedback loop and comprising a PLL oscillator (120), wherein the phase-locked loop circuit (110) is configured to receive a high-frequency reference signal (101), to provide a feedback signal (102) in the feedback loop, and to provide a high-frequency output signal (103), the high-frequency output signal (103) being generated by the PLL oscillator (120?) in response to the high-frequency reference signal (101) and to the feedback signal (102) where the feedback signal (102) is dependent on an earlier instance of the output signal (103), wherein the crystal-free oscillator circuit (100) further c