To reduce the power consumption, a tree-type and half-rate 1:4 demultiplexer is designed by employing all-CMOS logic in whole circuit. The proposed circuit is realized in TSMC 0.18ȝm CMOS process. The post simulated result shows that the fully integrated 1:4 DEMUX operates well up to 12Gb/s at a supply voltage of 1.8V, and the peak-to-peak value of output voltage swing is 400mV on an external 50 Ohm load. The total power consumption of the DEMUX is 56mW at 12 Gb/s. The overall chip has a size of 0.475×0.475mm 2 and the core size is 0.14mm×0.12mm.

Abstract.A bidirectional real-time data communication without distinction between master and slave is achieved with double TMS320F28335 DSP using its multichannel buffered serial port (McBSP). The shortcoming of the communication on SPI mode that the slave cannot initiate communication is overcame. The hardware connection and the software realization plan of the scheme are detailed. Finally, tests on uninterruptible power supply (UPS) inverter prototype controlled by double TMS320F28335 DSP verify the reliability and real features of this design.

Abstract. To obtain high-quality output voltage, a multi-loop control for UPS inverter is proposed. On the basis of double closed-loop control, repetitive control is introduced to improve total harmonic distortion (THD) of the output voltage. Also, RMS control is introduced to increase steady-state accuracy of the output voltage .Then, the choice of various control programs is discussed and the design of related parameters is analyzed. Experimental results verify the effectiveness of the control method in a 10kVA UPS inverter prototype.