WIRELESS COMMUNICATION DEVICE AND SYSTEM

摘要

The present invention is directed to a wireless communications device that includes an antenna configured to receive an RF signal from an ambient environment. The antenna is characterized by an antenna impedance and the RF signal is characterized by a predetermined frequency. A passive mixer assembly is coupled to the antenna without an RF matching network. The passive mixer assembly is characterized by a passive mixer impedance presented to the antenna. The passive mixer assembly includes a plurality of baseband mixer ports. The passive mixer assembly is configured to downconvert the RF signal and provide a plurality of baseband signals. Each baseband signal of the plurality of baseband signals is directed out of a corresponding port of the plurality of baseband mixer ports and characterized by a predetermined phase of a plurality of predetermined phases. A baseband low noise amplifier (baseband-LNA) assembly is coupled to the passive mixer assembly. The baseband-LNA assembly includes a baseband-LNA input portion configured to receive the plurality of baseband signals from the passive mixer assembly. The baseband-LNA assembly is configured to provide a plurality of amplified baseband signals from a baseband-LNA output portion. A baseband feedback network is coupled between the baseband-LNA output portion and the baseband-LNA input portion. The baseband feedback network includes a plurality of first adjustable resistive components. The plurality of first adjustable resistive components is selectively adjustable such that the passive mixer impedance is substantially matched to the antenna impedance at the predetermined RE frequency.