RFID reader with adjustable filtering and adaptive backscatter processing

摘要

A Radio Frequency Identification (RFID) reader in one embodiment of the invention includes an amplifier for amplifying an incoming RF signal, a switchable filter receiving an amplified signal from the amplifier, and mixers receiving a filtered signal from the filter. An RFID reader in another embodiment of the invention includes an RF section with an RF signal level control. A baseband section with baseband signal level control receives a signal from the RF section. The RF signal level control and the baseband signal level control are dynamically adjustable independently of each other. An RFID reader in another embodiment of the invention includes RF signal level control, and mixers receiving a signal from the RF signal level control. A level of a signal between the RF signal level control and the mixers is monitored. The RF signal level control is adjusted based on the monitored signal for preventing saturation of the mixers. Methods are also presented.