Low-noise voltage-controlled oscillator

A low-noise voltage-controlled oscillator, comprising a resonance circuit, a negative resistance circuit, a current source circuit and a feedback circuit, wherein

• the resonance circuit is configured to generate an oscillation signal of the voltage-controlled oscillator, the resonance circuit is an inductance-capacitance resonance circuit, and a capacitor in the resonance circuit is formed by a metal oxide semiconductor (MOS) varactor or a backward diode;
• the negative resistance circuit is configured to generate a negative resistance to counteract a positive resistance generated by the resonance circuit;
• the current source circuit is configured to generate a current for operation of the voltage-controlled oscillator;
• and
• the feedback circuit is configured to feed back the oscillation signal generated by the resonance circuit to the current source circuit,
• wherein the feedback circuit comprises a first capacitor and a second capacitor,
• one end of the first capacitor is connected to a first output terminal of the resonance circuit, the other end of the first capacitor is connected to a first signal input terminal of the current source circuit, a first resonant signal is fed back to the current source circuit via the first capacitor, and the other end of the first capacitor is a first output terminal of the voltage-controlled oscillator;
• and
• one end of the second capacitor is connected to a second output terminal of the resonance circuit the other end of the second ea capacitor is connected to a second signal input terminal of the current source circuit, a second resonant signal is fed back to the current source circuit via the second capacitor, and the other end of the second capacitor is a second output terminal of the voltage-controlled oscillator.