King Fahd University of Petroleum and Minerals

Sagar Kumar Dhar

Muhammad Taher Abuelma'Atti

Mohammad Said Sharawi

Munir A Al-Absi

Mohanad Ahmed Mohammed Elhassan Ahmed

The floating immittance emulator is presented in four embodiments in which four new topologies for emulating floating immittance functions are detailed. Each circuit uses three current-feedback operational-amplifiers (CFOAs) and three passive elements. The present topologies can emulate lossless and lossy floating inductances; capacitance, resistance, and inductance multipliers; and frequency-dependent positive and negative resistances.

Floating immittance emulator

The multi-band active integrated MIMO antenna is a planar structure that includes active devices such as power amplifiers (PA) for transmit modes, as well as low-noise-amplifiers (LNA) for receive modes or complete transceivers (both PA and LNA for bi-directional operation, i.e. transmit and receive modes simultaneously). The antenna provides active loading to facilitate a diversity advantage expected from 4G and 5G wireless systems. The integrated active amplifier device within the antenna increases system throughput while supporting multi-band operation for multi-wireless standards. Moreover, integration with the radio frequency front end eases matching while providing higher gain.

Multi-band active integrated MIMO antennas

The current-mode folding amplifier is a current-mode saw-tooth folding amplifier having a minimal number of current mirrors in the signal path from input to output. This minimizes the delays imposed by current mirrors on the speed of the amplifier. The amplifier has a full scale delay of 5.9 ns. The operation of the amplifier is verified in simulation using LFoundry 150 nm process in Cadence Tools.

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Sagar Kumar Dhar