Method, system, and apparatus for resonator circuits and modulating resonators
Embodiments of resonator circuits and modulating resonators and are described generally herein. One or more acoustic wave resonators may be coupled in series or parallel to generate tunable filters. One or more acoustic wave resonances may be modulated by one or more capacitors or tunable capacitors. One or more acoustic wave modules may also be switchable in a filter. Other embodiments may be described and claimed.
1. A tunable resonator comprising:
a first resonator module including a first resonator arranged in series with a first switch;
a second resonator module including a second resonator arranged in series with a second switch; and
a first variable capacitor coupled across the first and the second resonator module, wherein:
a) a passband of the tunable resonator is
i) a function of a fixed resonant frequency of each of the first and the second resonator modules; and
ii) to be modulated by opening or closing the first switch or the second switch,
b) a stopband of the tunable resonator is to be modulated by the first variable capacitor.
2. A tunable resonator system including a first tunable resonator and a second tunable resonator according to claim 1 , the first tunable resonator and the second tunable resonator being arranged in a series configuration.
3. The tunable resonator system of claim 2 , further comprising a tunable filter coupled with the first resonator and the second resonator of the first resonator module of the first tunable resonator, the tunable filter comprising a third resonator arranged in parallel with a second variable capacitor, the second variable capacitor being configured to vary an anti-resonant frequency of the tunable filter.
4. The tunable resonator system of claim 2 , wherein an anti-resonant frequency of each of the first and the second resonator modules of the first tunable resonator or the second tunable resonator has a frequency shift greater than 5% of a magnitude the resonant frequency of the corresponding resonator module.
5. The tunable resonator of claim 3 , the combination of the first resonator of the first tunable resonator and the third resonator forming a first filter when the first switch is closed, and the second switch is open and the combination of the second resonator and the third resonator forming a second filter when the first switch is open, and the second switch is closed.
6. The tunable resonator system of claim 3 , further comprising an inversion module coupled to the first tunable resonator and to the second tunable resonator.
7. The tunable resonator system of claim 6 , wherein the inversion module comprises a K-filter.
8. The tunable resonator system of claim 7 , wherein the K-filter comprises two capacitors in series and a third capacitor in parallel.
9. The tunable resonator system of claim 8 , wherein the third capacitor is coupled to ground.
10. The tunable resonator of claim 1 , wherein the first and the second switches of the first tunable resonator or the second tunable resonator include metal-oxide-semiconductor field-effect transistor (MOSFET) devices.
11. The tunable resonator of claim 1 , wherein the first and the second switches are controllable by corresponding switch control signals.
12. A method of tuning a tunable resonator, the tunable resonator comprising:
a first resonator module including a switchable first resonator;
a second resonator module including a switchable second resonator; and
a variable capacitor coupled across the first and the second resonator modules, the method comprising:
centering a passband of the tunable resonator as a function of a fixed resonant frequency of each of the first and the second resonator modules;
modulating the passband by switching in or out the first resonator or the second resonator, and
modulating a stopband of the tunable resonator by varying the variable capacitor.
13. The method of claim 12 , wherein an anti-resonant frequency of each of the first and the second resonator modules has a frequency shift greater than 5% of a magnitude the resonant frequency of the corresponding resonator module.