Power control loop and LO generation method
First Claim
Patent Images
1. A method for use in an RFID reader, the method comprising:
- providing an output signal from an amplifier of a transmitter;
attenuating the output signal via a step attenuator;
comparing the attenuated output signal to a reference value; and
adjusting power to the amplifier until the attenuated output signal is substantially equal to the reference value;
wherein the attenuated output signal drives a local oscillator signal of a receiver thereby canceling noise generated by the transmitter in the receiver.
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Abstract
A method for use in a RFID reader, the method comprising providing an output signal from an amplifier of a transmitter, attenuating the output signal via a step attenuator, detecting and comparing the attenuated output signal to a reference value, and adjusting power to the amplifier until the attenuated output signal is substantially equal to the reference value. The attenuated output signal drives a local oscillator signal of a receiver thereby canceling noise generated by the transmitter in the receiver.
41 Citations
20 Claims
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1. A method for use in an RFID reader, the method comprising:
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providing an output signal from an amplifier of a transmitter; attenuating the output signal via a step attenuator; comparing the attenuated output signal to a reference value; and adjusting power to the amplifier until the attenuated output signal is substantially equal to the reference value; wherein the attenuated output signal drives a local oscillator signal of a receiver thereby canceling noise generated by the transmitter in the receiver. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An apparatus for use in an RFID reader, the apparatus comprising:
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a power amplifier of a transmitter having an output signal; a programmable step attenuator attenuating the output signal; and a controller comparing the attenuated output signal with a reference signal, wherein the controller adjusts power to the amplifier until the attenuated output signal is substantially equal to the reference signal; wherein the attenuated output signal is operable to drive a local oscillator signal of a receiver thereby canceling noise generated by the transmitter in the receiver. - View Dependent Claims (13, 14, 15, 16)
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17. A system, comprising:
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a transmitter having a power amplifier with an output signal; a programmable step attenuator attenuating the output signal; a controller that compares the attenuated output signal with a reference value, wherein the controller adjusts power to the amplifier until the attenuated output signal is substantially equal to the reference signal; a receiver having a local oscillator signal that is driven by the attenuated output signal, wherein the output signal of the transmitter and the local oscillator signal of the receiver are derived from a common frequency source thereby canceling noise generated by the transmitter in the receiver. - View Dependent Claims (18, 19, 20)
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Specification