Oscillating circuit and method for calibrating a resonant frequency of an LC tank of an injection-locked oscillator (ILO) of the oscillating circuit while stopping self-oscillation of the ILO

An oscillating circuit, comprising:

• an injection-locked oscillator (ILO), comprising:
• a Gm cell, comprising:
• a first node, for receiving a first injection signal;
• a second node, for receiving a second injection signal, wherein the first injection signal and the second injection signal are differential signals;
• a first output end;
• and
• a second output end, wherein the Gm cell is configured to provide a negative resistance between the first output end and the second output end;
• and
• an LC tank, comprising:
• a first inductor, having a first end coupled to the second output end and a second end coupled to the first output end;
• a first capacitor, having a first end coupled to the second output end and the first end of the first inductor and a second end coupled to the first output end and the second end of the first inductor;
• and
• a second inductor, magnetically coupled to the first inductor for generating an output voltage;
• and
• a calibration circuit, coupled to the LC tank, configured to tune a resonant frequency of the LC tank to a specific frequency of the first injection signal and the second injection signal, and further configured to control the ILO to stop self-oscillating by reducing magnitude of the negative resistance while tuning the resonant frequency of the LC tank.