Methods and apparatus for tuning devices having mechanical resonators
First Claim
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1. A method of tuning a device having a mechanical resonator, the method comprising:
- producing a differential output signal of the mechanical resonator, the differential output signal comprising a first end and a second end;
producing a phase-shifted signal by phase shifting at least one of the first end and the second end, wherein producing the phase-shifted signal comprises phase shifting the first end by a first amount and phase shifting the second end by a second amount, wherein the first amount and the second amount differ from each other by between three degrees and twenty degrees; and
providing the phase-shifted signal as an input signal to the mechanical resonator.
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Abstract
Methods and apparatus for tuning devices having mechanical resonators are described. In one implementation, a mechanical resonator and a phase shifter are configured in a feedback loop, so that the phase shifter shifts the phase of the resonator output signal. The amount of phase shift induced by the phase shifter may be variable. In another implementation, an LC tuning subcircuit is coupled to a mechanical resonator. In some implementations, the LC tuning subcircuit has a variable capacitance. One or more of the apparatus described herein may be implemented as part, or all, of a microelectromechanical system (MEMS).
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Citations
5 Claims
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1. A method of tuning a device having a mechanical resonator, the method comprising:
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producing a differential output signal of the mechanical resonator, the differential output signal comprising a first end and a second end; producing a phase-shifted signal by phase shifting at least one of the first end and the second end, wherein producing the phase-shifted signal comprises phase shifting the first end by a first amount and phase shifting the second end by a second amount, wherein the first amount and the second amount differ from each other by between three degrees and twenty degrees; and providing the phase-shifted signal as an input signal to the mechanical resonator. - View Dependent Claims (2, 3, 4, 5)
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Specification