System and method for using an input data signal as a clock signal in a RFID tag state machine
AssigneeNational Semiconductor Corporation
InventorSrinath B. Pai
Life of this patent
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Abstract
A system and method is disclosed for using an input data signal as a clock signal in a state machine of a radio frequency identification (RFID) tag. An output of a demodulator in the RFID tag is directly coupled to a clock input of the command state machine in the RFID state machine. The command state machine receives an edge detect signal directly from the input data signal and then immediately generates backscatter signals to begin a backscatter process. The edge detect signal may comprise a rising edge of a data symbol of the RFID protocol. The immediate initiation of the backscatter process reduces latency of the backscatter process in the RFID state machine.
Claims20
An apparatus for providing an edge detect signal to a command state machine of a state machine of a radio frequency identification (RFID) tag, wherein said apparatus comprises:
- a demodulator configured to demodulate a radio frequency signal to obtain a data signal, the demodulator having an output directly connected to a clock input of said command state machine in order to clock said command state machine using said data signal.
A method comprising the steps of:
- demodulating a radio frequency signal using a demodulator in a radio frequency identification (RFID) tag to obtain a data signal;
- and
- providing said data signal from said demodulator to a clock input of a command state machine in said RFID tag in order to clock said command state machine using said data signal.
A radio frequency identification (RFID) tag, comprising:
- a command state machine;
- and
- a demodulator configured to demodulate a radio frequency signal to obtain a data signal, the demodulator having an output directly connected to a clock input of the command state machine in order to clock the command state machine using the data signal.
Dependencies are inferred from the claim text.