Remote wireless switch sensing circuit using RF transceiver in combination with a SAW chirp processor
First Claim
1. A circuit assembly for sensing a state of a variable state device wherein a data signal representative of the state is communicated via wireless telegraphy comprising:
- a surface acoustic wave (SAW) device having a plurality of interdigital transducers (IDTs) comprising a wave launching IDT and a state information IDT wherein the plurality of IDTs are in acoustical communication and the state information IDT is in selective electrical communication with an antenna by the variable state device, the variable state device being disposed to selectively interrupt the electrical communication between the state information IDT and the antenna;
an RF transceiver for communicating a trigger signal to the SAW device wherein the trigger signal causes a launching of a SAW wave from the wave launching IDT towards the state information IDT and the state information IDT generates an electrical signal pulse in response thereto, said electrical signal pulse being selectively communicated to the antenna through said variable state device; and
,a transceiver control module in operative communication with the RF transceiver for enabling communication of the trigger signal and for reading the data signal comprising an absence or presence of the signal pulse wherein the trigger signal and the data signal are communicated between the RF transceiver and the SAW device via wireless telegraphy.
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Abstract
A circuit assembly senses a state of a variable state device, wherein a data signal representative of the state is communicated via wireless telegraphy. A surface acoustic wave (SAW) device, having a plurality of interdigital transducers (IDTs) comprises a wave launching IDT and a state information IDT, wherein the plurality of IDTs are in acoustical communication and the state information IDT is in electrical communication with an antenna through the variable state device. An RF transceiver communicates a trigger signal to the SAW device, wherein the trigger signal causes a launching of a SAW wave from the wave launching IDT towards the state information IDT. The state information IDT generates a signal pulse in response thereto and communicates the pulse to the antenna through the variable state device. A transceiver control module, in operative communication with the RF transceiver enables communication of the trigger signal and reads the data signal, wherein the trigger signal and data signal are communicated between the RF transceiver in the SAW device via wireless telegraphy.
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Citations
9 Claims
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1. A circuit assembly for sensing a state of a variable state device wherein a data signal representative of the state is communicated via wireless telegraphy comprising:
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a surface acoustic wave (SAW) device having a plurality of interdigital transducers (IDTs) comprising a wave launching IDT and a state information IDT wherein the plurality of IDTs are in acoustical communication and the state information IDT is in selective electrical communication with an antenna by the variable state device, the variable state device being disposed to selectively interrupt the electrical communication between the state information IDT and the antenna; an RF transceiver for communicating a trigger signal to the SAW device wherein the trigger signal causes a launching of a SAW wave from the wave launching IDT towards the state information IDT and the state information IDT generates an electrical signal pulse in response thereto, said electrical signal pulse being selectively communicated to the antenna through said variable state device; and
,a transceiver control module in operative communication with the RF transceiver for enabling communication of the trigger signal and for reading the data signal comprising an absence or presence of the signal pulse wherein the trigger signal and the data signal are communicated between the RF transceiver and the SAW device via wireless telegraphy. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification