BAW oscillators with dual BAW temperature sensing

An apparatus, comprising:

• a first oscillator having a first oscillator output;
• a second oscillator having a second oscillator output;
• a first frequency divider having a first divider control input, a first divider input, and a first divider output, the first divider input coupled to the first oscillator output;
• a second frequency divider having a second divider control input, a second divider input, and a second divider output, the second divider input coupled to the second oscillator output;
• a processing circuit having first and second inputs, first and second divider control outputs, and a processing output, the first input coupled to the first divider output, the second input coupled to the second divider output, the first divider control output coupled to the first divider control input, the second divider control output coupled to the second divider control input, and the processing circuit configured to:
• provide a first divisor signal at the first divider control output, the first divisor signal representing a first divisor value;
• provide a second divisor signal at the second divider control output responsive to a first oscillating signal at the first input and a second oscillating signal at the second input, the second divisor signal representing a second divisor value;
• and
• provide a temperature compensation signal at the processing output based on the first and second divisor values.

An apparatus, comprising:

• a first oscillator having a first frequency control input and a first oscillator output;
• a second oscillator having a second frequency control input and a second oscillator output;
• a processing circuit having first and second inputs and a processing output, the first input coupled to the first oscillator output, and the second input coupled to the second oscillator output;
• a first frequency compensation circuit having a first frequency compensation input and a first frequency compensation output, the first frequency compensation input coupled to the processing output, and the first frequency compensation output coupled to the first frequency control input;
• and
• a second frequency compensation circuit having a second frequency compensation input and a second frequency compensation output, the second frequency compensation input coupled to the processing output, and the second frequency compensation output coupled to the second frequency control input.