Temperature compensation method of temperature compensated crystal oscillator and crystal oscillator

The invention belongs to the technical field of crystal oscillator design, and particularly discloses a temperature compensation method of a temperature compensated crystal oscillator and the crystal oscillator. The temperature compensation method comprises the following steps: measuring a working temperature signal of a crystal resonator in the temperature compensated crystal oscillator; generating a frequency control signal according to the working temperature signal and a predetermined target nominal frequency temperature curve, and controlling the oscillation frequency of the crystal resonator by using the frequency control signal; wherein the target nominal frequency temperature curve is obtained by adding a linear compensation line segment to an initial nominal frequency temperature curve of the crystal resonator for linear compensation, and the initial nominal frequency temperature curve is obtained by compensating frequency deviation of the crystal resonator through a polynomial compensation function