Acoustic galvanic isolator incorporating film acoustically-coupled transformer
First Claim
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1. An acoustic galvanic isolator, comprising:
- a carrier signal source;
a modulator connected to receive an information signal and the carrier signal;
a demodulator; and
connected between the modulator and the demodulator, an electrically-isolating acoustic coupler comprising an electrically-isolating film acoustically-coupled transformer (FACT), wherein the FACT comprises;
a first decoupled stacked bulk acoustic resonator (DSBAR) and a second DSBAR, each of the DSBARs comprising;
a first film bulk acoustic resonator (FBAR);
a second FBAR;
an acoustic decoupler between the first FBAR and the second FBAR, wherein each of the FBARs comprises an opposed pair of electrodes and a piezoelectric element between the electrodes; and
a first electrical circuit interconnecting the first FBARs of the DSBARs in series; and
a second electrical circuit interconnecting the second FBARs of the DSBARs in series, wherein the first electrical circuit additionally connects the first FBARs to the modulator, and the second electrical circuit additionally connects the second FBARs to the demodulator; and
wherein;
the first electrical circuit is connected to the electrodes of the first FBARs remote from the acoustic decouplers; and
the second electrical circuit is connected to the electrodes of the second FBARs remote from the acoustic decouplers.
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Abstract
Embodiments of the acoustic galvanic isolator comprise a carrier signal source, a modulator connected to receive an information signal and the carrier signal, a demodulator, and, connected between the modulator and the demodulator, an electrically-isolating acoustic coupler comprising an electrically-isolating film acoustically-coupled transformer (FACT).
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Citations
12 Claims
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1. An acoustic galvanic isolator, comprising:
- a carrier signal source;
a modulator connected to receive an information signal and the carrier signal;
a demodulator; and
connected between the modulator and the demodulator, an electrically-isolating acoustic coupler comprising an electrically-isolating film acoustically-coupled transformer (FACT), wherein the FACT comprises;a first decoupled stacked bulk acoustic resonator (DSBAR) and a second DSBAR, each of the DSBARs comprising;
a first film bulk acoustic resonator (FBAR);
a second FBAR;
an acoustic decoupler between the first FBAR and the second FBAR, wherein each of the FBARs comprises an opposed pair of electrodes and a piezoelectric element between the electrodes; anda first electrical circuit interconnecting the first FBARs of the DSBARs in series; and a second electrical circuit interconnecting the second FBARs of the DSBARs in series, wherein the first electrical circuit additionally connects the first FBARs to the modulator, and the second electrical circuit additionally connects the second FBARs to the demodulator; and
wherein;
the first electrical circuit is connected to the electrodes of the first FBARs remote from the acoustic decouplers; and
the second electrical circuit is connected to the electrodes of the second FBARs remote from the acoustic decouplers. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
- a carrier signal source;
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10. A method for galvanically isolating an information signal, the method comprising:
- providing an electrically-isolating acoustic coupler comprising an electrically-isolating film acoustically-coupled transformer (FACT), wherein the FACT comprises a first decoupled stacked bulk acoustic resonator (DSBAR) and a second DSBAR, each of the DSBARs comprising a first film bulk acoustic resonator (FBAR), a second FBAR and an acoustic decoupler between the FBARs;
providing a carrier signal;
modulating the carrier signal with the information signal to form a modulated electrical signal;
acoustically coupling the modulated electrical signal through the electrically-insulating acoustic coupler; and
recovering the information signal from the modulated electrical signal acoustically coupled through the electrically-isolating acoustic coupler, wherein each FBAR comprises first planar electrodes adjacent the acoustic decoupler, second electrodes remote from the acoustic decoupler, and a piezoelectric element between the electrodes; and
the coupling comprises;
applying the modulated electrical signal to the first electrodes of the first FBARs, and receiving the modulated electrical signal from the first electrodes of the second FBARs. - View Dependent Claims (11, 12)
- providing an electrically-isolating acoustic coupler comprising an electrically-isolating film acoustically-coupled transformer (FACT), wherein the FACT comprises a first decoupled stacked bulk acoustic resonator (DSBAR) and a second DSBAR, each of the DSBARs comprising a first film bulk acoustic resonator (FBAR), a second FBAR and an acoustic decoupler between the FBARs;
Specification