METHOD AND SYSTEM FOR ADAPTIVE OPERATION OF A POWER AMPLIFIER OF A RADIO FREQUENCY IDENTIFICATION (RFID) READER DEVICE
First Claim
1. A method for adaptive operation of a power amplifier of a radio frequency identification (RFID) reader device, the method comprising:
- transmitting a radio frequency (RF) interrogation signal from an antenna of the RFID reader device;
receiving a reflected signal as a partial reflection of the interrogation signal;
estimating a return loss value by comparing at least one parameter of the interrogation signal and at least one parameter of the reflected signal; and
adjusting an operating point of the power amplifier in response to the return loss value.
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Abstract
A method and system for adaptive operation of a power amplifier of an RFID reader device enables more efficient power management of the reader device. The method includes transmitting an RF interrogation signal from an antenna of the RFID reader device (step 505). A reflected signal is then received as a partial reflection of the interrogation signal (step 510). A return loss value is then estimated by comparing at least one parameter of the interrogation signal and at least one parameter of the reflected signal (step 515). Finally, an operating point of the power amplifier is adjusted in response to the return loss value (step 520).
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Citations
16 Claims
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1. A method for adaptive operation of a power amplifier of a radio frequency identification (RFID) reader device, the method comprising:
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transmitting a radio frequency (RF) interrogation signal from an antenna of the RFID reader device; receiving a reflected signal as a partial reflection of the interrogation signal; estimating a return loss value by comparing at least one parameter of the interrogation signal and at least one parameter of the reflected signal; and adjusting an operating point of the power amplifier in response to the return loss value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A system for adaptive operation of a power amplifier of a radio frequency identification (RFID) reader device, the system comprising:
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a radio frequency (RF) front end for transmitting an RF interrogation signal from an antenna of the RFID reader device; an RF detector coupled to the RF front end for receiving a reflected signal as a partial reflection of the interrogation signal; a controller coupled to the RF detector for estimating a return loss value by comparing at least one parameter of the interrogation signal and at least one parameter of the reflected signal; and bias electronics coupled to the controller for adjusting an operating point of the power amplifier in response to the return loss value. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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Specification