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To meet ever-growing demands for higher mobile data-rates, LTE standards continue to evolve. While carrier aggregation (CA) improves data-rates, it requires wider aggregated signal bandwidth that limits the number of users that can be serviced. Techniques like 256QAM and 4×4 MIMO are attractive because improvements do not need wider signal bandwidth. To support 256QAM and 4×4 MIMO for the 5GHz band,...
The combination of membrane bioreactor and reverse osmosis (MBR–RO) is becoming an attractive technology for wastewater reclamation and reuse. In this work, the combined MBR–RO technology was applied to treat the semiconductor wastewater through a two-phase (I, II) operation. To demonstrate the feasibility of this technology, the operational performances of MBR and RO were investigated in Phase I...
Concentration of rejected salt at the membrane surface when colloidal particles were deposited on the membrane was determined experimentally based on measured salt permeate. This approach allowed for a clear identification of individual contributions of concentration polarization and colloidal fouling to the permeate flux decline. The observed transient behavior of permeate flux, salt rejection, mass...
A digital IF to RF converter architecture with an RF VGA targeted for WCDMA transmitters is presented. The RFDAC consists of a 1.5-bits current steering DAC with an embedded semi-digital FIR filter and a mixer with an LC load. The VGA controls the output power in 10 dB steps. The prototype is fabricated in 0.18 mum CMOS technology and achieves 0 dBm output power at 2 GHz and 33 dB image rejection...
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