A radio frequency oscillator , comprising: a resonator circuit being resonant at an excitation of the resonator circuit in a differential mode and at an excitation of the resonator circuit in a common mode, wherein the resonator circuit has a differential mode resonance frequency at the excitation in the differential mode, and wherein the resonator circuit has a common mode resonance frequency at the excitation in the common mode, and comprises a transformer , a primary capacitor , and a secondary capacitor , wherein the transformer comprises a primary winding and a secondary winding , the primary winding being inductively coupled with the secondary winding , wherein the primary capacitor is connected to the primary winding , the primary capacitor and the primary winding forming a primary circuit, and wherein the secondary capacitor is connected to the secondary winding , the secondary capacitor and the secondary winding forming a secondary circuit; a first excitation circuit being configured to excite the resonator circuit in the differential mode to obtain a differential mode oscillator signal oscillating at the differential mode resonance frequency; and a second excitation circuit being configured to excite the resonator circuit in the common mode to obtain a common mode oscillator signal oscillating at the common mode resonance frequency, characterized in that a ratio of turns of the primary and secondary windings is 1:2; the resonator circuit and the first excitation circuit are arranged to form a cross-coupled oscillator or a transformer-coupled oscillator to obtain the differential mode oscillator signal; and the resonator circuit and the second excitation circuit are arranged to form a Colpitts oscillator to obtain the common mode oscillator signal. a resonator circuit being resonant at an excitation of the resonator circuit in a differential mode and at an excitation of the resonator circuit in a common mode, wherein the resonator circuit has a differential mode resonance frequency at the excitation in the differential mode, and wherein the resonator circuit has a common mode resonance frequency at the excitation in the common mode, and comprises a transformer , a primary capacitor , and a secondary capacitor , wherein the transformer comprises a primary winding and a secondary winding , the primary winding being inductively coupled with the secondary winding , wherein the primary capacitor is connected to the primary winding , the primary capacitor and the primary winding forming a primary circuit, and wherein the secondary capacitor is connected to the secondary winding , the secondary capacitor and the secondary winding forming a secondary circuit; a first excitation circuit being configured to excite the resonator circuit in the differential mode to obtain a differential mode oscillator signal oscillating at the differential mode resonance frequency; and a second excitation circuit being configured to excite the resonator circuit in the common mode to obtain a common mode oscillator signal oscillating at the common mode resonance frequency, characterized in that a ratio of turns of the primary and secondary windings is 1:2; the resonator circuit and the first excitation circuit are arranged to form a cross-coupled oscillator or a transformer-coupled oscillator to obtain the differential mode oscillator signal; and the resonator circuit and the second excitation circuit are arranged to form a Colpitts oscillator to obtain the common mode oscillator signal. <EOS>