Patent ID: 8138858

Claim:
A surface acoustic wave (SAW) device comprising: a piezoelectric substrate; and a conductive layer over the piezoelectric substrate and forming: a first 2-interdigital transducer (2-IDT) dual-mode SAW device (DMSD), wherein the first 2-IDT DMSD comprises a first 1 inter-digital transducer (IDT) having a first SC node adapted to receive an input signal and a first FC node coupled to a direct current (DC) reference and a first 2 IDT having a first TC node and a first 4C node; a second 2-IDT DMSD electrically coupled to the first 2-IDT DMSD and, wherein the second 2-IDT DMSD comprises a second 1 IDT having a second SC node and a second FC node and a second 2 IDT having a second TC node coupled to the DC reference and a second 4C node adapted to receive the input signal; a third 2-IDT DMSD electrically coupled to the first 2-IDT DMSD and, wherein the third 2-IDT DMSD comprises a third 1 IDT having a third SC node coupled to the DC reference and a third FC node adapted to provide a first output signal based on the input signal and a third 2 IDT having a third TC node and a third 4C node; and a fourth 2-IDT DMSD electrically coupled to the second 2-IDT DMSD and to the third 2-IDT DMSD, and, wherein the fourth 2-IDT DMSD comprises a fourth 1 IDT having a fourth SC node and a fourth FC node and a fourth 2 IDT having a fourth TC node adapted to provide a second output signal based on the input signal and a fourth 4C node coupled to the DC reference wherein the first 4C node and the second SC node are coupled and the third TC node and the fourth FC node are coupled, but the first 4C node is not coupled to the third TC node.