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:
- producing a carrier wave from the power amplifier to an antenna for transmitting to an RFID tag;
receiving a reflected signal back from the antenna as a partial reflection of the carrier wave;
estimating a return loss value of the reflected signal by comparing a signal power of the carrier wave and a signal power of the reflected signal; and
adjusting an operating bias point of the power amplifier in response to the return loss value.
4 Assignments
0 Petitions
Accused Products
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).
-
Citations
14 Claims
-
1. A method for adaptive operation of a power amplifier of a radio frequency identification (RFID) reader device, the method comprising:
-
producing a carrier wave from the power amplifier to an antenna for transmitting to an RFID tag; receiving a reflected signal back from the antenna as a partial reflection of the carrier wave; estimating a return loss value of the reflected signal by comparing a signal power of the carrier wave and a signal power of the reflected signal; and adjusting an operating bias point of the power amplifier in response to the return loss value. - View Dependent Claims (2, 3, 4, 5, 6, 7)
-
-
8. A system for adaptive operation of a power amplifier of a radio frequency identification (RFID) reader device, the system comprising:
-
a radio frequency (RF) front end comprising the power amplifier for producing a carrier wave to an antenna for transmitting to an RFID tag; an RF detector coupled to the RF front end for receiving a reflected signal back from the antenna as a partial reflection of the carrier wave; a controller coupled to the RF detector for estimating a return loss value of the reflected signal by comparing a signal power of the carrier wave and a signal power of the reflected signal; and bias electronics coupled to the controller for adjusting an operating bias point of the power amplifier in response to the return loss value. - View Dependent Claims (9, 10, 11, 12, 13, 14)
-
Specification