Integrable phase-locked loop including an acoustic resonator

An apparatus, comprising:

• a comparator having a first input terminal to receive a reference frequency, a second input terminal, and an output terminal;
• a filter having an input terminal coupled to the output terminal of the comparator and having an output terminal to provide a control signal;
• an oscillator to generate a frequency to be controlled, the oscillator having an output terminal and an input terminal coupled to the output terminal of the filter, the oscillator including a resonator having first and second frequencies, the resonator being associated with a first partner element having a characteristic that can be varied to tune the resonator to substantially the first frequency in response to the control signal, the resonator being associated with a second partner element having a characteristic that can be varied to substantially cancel the second frequency, said resonator being a bulk acoustic wave (BAW) type resonator having a high quality coefficient;
• and
• a dividing block having an input terminal coupled to the output terminal of the oscillator and having an output terminal coupled to the second input terminal of the comparator.

A system, comprising:

• a wireless device;
• a semiconductor product included with the wireless device;
• and
• an electronic circuit arranged on the semiconductor product, the electronic circuit having a phase-locked loop to provide a control signal, the phase-locked loop including:
• a bulk acoustic wave (BAW) type resonator having first and second frequencies and having a high quality coefficient provided by:
• a first partner element associated with the resonator to substantially cancel the first frequency;
• and
• a second partner element associated with the resonator to tune the resonator to substantially the second frequency in response to the control signal.

A system, comprising:

• phase-locked loop means for generating a control signal, the phase-locked loop means including a bulk acoustic wave (BAW) type resonator having first and second frequencies;
• first and second element means for tuning to a vicinity of the first and second frequencies of the resonator, respectively;
• means for varying a characteristic of the first element means to tune the first element means to the vicinity of the first frequency for substantially canceling the first frequency of the resonator;
• and
• means responsive to the control signal from the phased-lock loop means for varying a characteristic of the second element means to provide said resonator with a high quality coefficient and to tune the resonator to substantially the second frequency, wherein said resonator and said first and second element means are present on a same silicon semiconductor substrate.

A method for a bulk acoustic wave (BAW) type resonator having first and second frequencies, the method comprising:

• coupling first and second partner elements to the BAW type resonator, said first and second partner elements providing said BAW type resonator with a high quality coefficient;
• generating a control signal from a phase-locked loop;
• varying a characteristic of the first partner element to tune the first partner element close to the first frequency to substantially cancel the first frequency;
• and
• providing the generated control signal to the second partner element to adjust tuning of the resonator to the substantially the second frequency.