The origins of the sampling theorem
IEEE Communications Magazine
Digital RF processing: toward low-cost reconfigurable radios
IEEE Communications Magazine
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The approach of time division multiplexing (TDM) within an integrated wireless receiver to reduce the power, area and cost of multiple antenna receivers is studied. A solution is proposed to address the cross-interference between multiplex channels that affected previous attempts at TDM for multiple receive antennas. Detailed analysis from a radio system viewpoint is provided for when TDM is used as a low complexity hardware technique for managing multiple antenna channels. Simple closed form noise figure relations in terms of the number of multiplex channels and the anti-alias filter rejection are developed. Noise figure expressions that relate an individual TDM amplifier or TDM amplifier array's noise figure to that of a regular static amplifier are also given. These simple relations provide a quick method of determining expected noise figure of such systems. A four-antenna 2.4 GHz LNA array circuit in CMOS is designed in a O.18-µm technology. The noise and linearity performance of this circuit is measured to verify the developed theory. The results obtained show close agreement with the developed model of the TDM-based multiantenna receiver system.