Notch filter calibration in LC oscillators for supply noise rejection

An apparatus, comprising:

• an inductive-capacitance oscillator to receive a power supply signal from a voltage regulator and to provide an output signal having a frequency based on a voltage of the power supply signal;
• one or more notch filters coupled to the voltage regulator to filter the power supply signal according to a calibration code;
• and
• a control circuit coupled to the voltage regulator and the one or more notch filters, the control circuit is to optimize the calibration code to minimize a sensitivity of the inductive-capacitance oscillator to noise in the power supply signal, wherein to optimize the calibration code, the control circuit is to determine a first frequency of the output signal when the calibration code is an initial value and the voltage of the power supply signal is a first voltage, to determine a second frequency of the output signal when the calibration code is the initial value and the voltage of the power supply signal is a second voltage, greater than the first voltage, and to adjust the calibration code based on whether the first frequency exceeds the second frequency.