Oscillator circuit having temperature compensation based on resonator group-delay analysis

A circuit, comprising:

• a first resonator having first and second terminals;
• a temperature compensation circuit including a resonator group-delay analyzer and a second resonator, the resonator group-delay analyzer having first and second analyzer inputs and an analyzer output, the second resonator having third and fourth terminals, the fourth terminal coupled to the first analyzer input;
• oscillator control circuitry having a first control input, first and second outputs, and an oscillator output, the first output coupled to the first terminal, and the second output coupled to the second terminal;
• and
• a controller having a second control input and a control output, the second control input coupled to the analyzer output, and the control output coupled to first control input, in which the controller is configured to provide a control signal at the control output responsive to a group-delay parameter received at the second control input, and the oscillator control circuitry is configured to adjust a frequency of an output signal at the oscillator output responsive to the control signal.