Patent ID: 7737807

Claim:
A 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: a first decoupled stacked bulk acoustic resonator (DSBAR) comprising an acoustically-resonant electrical insulator, and a second DSBAR comprising acoustically-resonant electrical insulator, each of the DSBARs further comprising: a first film bulk acoustic resonator (FBAR); a second FBAR and an acoustic decoupler between the first FBAR and the second FBAR, wherein the DSBARs are connected in series; and each of the DSBARs further comprises an additional acoustic decoupler between the FBARs; and the acoustically-resonant electrical insulator comprises a quarter-wave layer of electrically-insulating material located between the acoustic decoupler and the additional acoustic decoupler.