Millimeter wave voltage-controlled oscillator

The millimeter wave voltage-controlled oscillator comprises an output matching module which is connected with a power supply and is used for suppressing clutters at an output end; the cascode negative resistance buffer module is connected with the output matching module and used for providing negative resistance and isolating an output load from a resonant cavity, and the negative resistance buffer unit comprises a plurality of switching tubes; the transformer module is connected with the cascode negative resistance buffer module; the variable capacitance module is connected with the transformer module; the resonant capacitor module is connected with the transformer module and the cascode negative resistance buffer module; and the tail current module is connected with the resonant capacitor module and the cascode negative resistance buffer module and is used for isolating parasitic capacitance and noise. Through cooperation of a plurality of modules, a wide oscillation frequency regulation and control range a