Apparatus and method for compensation of AM noise in RFID devices through modulation of a received signal
First Claim
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1. A method for compensation of noise in a Radio Frequency Identification (RFID) device through modulation of a received signal, the method comprising:
- determining an amplitude signal proportional to an amplitude of a transmitter signal and associated noise;
processing the amplitude signal to derive a correction signal through a programmable stage that amplifies the amplitude signal and creates the correction signal; and
modulating a received signal during a receive period with the correction signal to substantially remove the associated noise from the received signal.
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Abstract
A method and apparatus for compensation of noise in a Radio Frequency Identification (RFID) device through modulation of a received signal is described. The method includes determining an amplitude signal proportional to an amplitude of a transmitter signal and associated noise; processing the amplitude signal to derive a correction signal; and modulating a received signal during a receive period with the correction signal to substantially remove the associated noise from the received signal. An RFID device and an RFID transceiver integrated circuit (IC) are also described.
18 Citations
18 Claims
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1. A method for compensation of noise in a Radio Frequency Identification (RFID) device through modulation of a received signal, the method comprising:
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determining an amplitude signal proportional to an amplitude of a transmitter signal and associated noise; processing the amplitude signal to derive a correction signal through a programmable stage that amplifies the amplitude signal and creates the correction signal; and modulating a received signal during a receive period with the correction signal to substantially remove the associated noise from the received signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A Radio Frequency Identification (RFID) device, the RFID device comprising:
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a transmitter; a receiver; a coupling device coupling the transmitter and the receiver to an antenna; a noise compensation function comprising circuitry configured to; determine an amplitude signal proportional to an amplitude of a transmitter signal and associated noise from the transmitter; process the amplitude signal to derive a correction signal through a programmable stage that amplifies the amplitude signal and creates the correction signal; and modulate a received signal during a receive period from the receiver with the correction signal to substantially remove the associated noise from the received signal. - View Dependent Claims (13, 14, 15, 16, 17)
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18. A Radio Frequency Identification (RFID) transceiver integrated circuit, the RFID transceiver integrated circuit comprising:
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a transmitter; a receiver, wherein each of the transmitter and the receiver are configured to utilize a same antenna; a noise compensation function comprising circuitry configured to; determine an amplitude signal proportional to an amplitude of a transmitter signal and associated noise from the transmitter; process the amplitude signal to derive a correction signal through a programmable stage that amplifies the amplitude signal and creates the correction signal; and modulate a received signal during a receive period from the receiver with the correction signal to substantially remove the associated noise from the received signal.
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Specification