Insulation of anti-resonance in resonators
OwnerYong Ping Xu, Wai Hoong Sun +3inventors
InventorsYong Ping Xu, Wai Hoong Sun, Xiaofeng Wang, Zhe Wang, Sean Ian Saxon Liw
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Abstract
A cancellation circuit to remove the anti-resonance signal from a resonator. Micro-mechanical and surface and bulk acoustic wave resonators include an anti-resonance in an output signal. This has an undesirable effect on certain types of systems in their function and performance. An anti-resonance cancellation circuit removes the anti-resonance from the output of the resonators by providing a signal which is subtracted from the output of the resonator. The cancellation circuit includes a capacitor which is matched to the static capacitance of the resonator. The loads of the resonator and cancellation network are also matched.
Claims18
A resonator system, comprising:
- a resonator to receive an input signal and provide a first output signal at a first output;
- a cancellation network to receive said input signal and provide a second output signal at a second output;
- a subtractor having a positive input connected to said first output and a negative input connected to said second output to combine said first and second output signals and cancel at least a portion of an anti-resonance from said first output signal;
- a first load comprising a first load capacitor connected to said first output;
- and
- a second load comprising a second load capacitor connected to said second output.
A method for cancelling an anti-resonance signal, comprising:
- receiving an input signal at an input of a resonator having an output coupled to a first load;
- receiving said input signal at an input of a cancellation circuit having an output coupled to a second load;
- and
- subtracting a first output signal at the output of said cancellation circuit from a second output signal at the output of said resonator to produce a subtractor output signal, wherein the subtractor output contains a resonance signal from said resonator, wherein a capacitance of said cancellation circuit is substantially equal to a static capacitance of said resonator.
A cellular telephone comprising:
- a software-defined radio adapted to receive a resonance signal;
- and
- a resonator system, said resonator system comprising:
- a resonator to receive an input signal and provide a first output signal at a first output connected to a first load;
- a cancellation network to receive said input signal and provide a second output signal at a second output connected to a second load;
- and
- a subtractor having a positive input connected to said first output and a negative input connected to said second output to combine said first and second output to form a subtractor output signal that includes said resonance signal.
Dependencies are inferred from the claim text.