We propose and demonstrate a repeaterless directly modulated fiber optical CATV transport system based on half-split-band and remote light injection techniques. Good performances of carrier-to-noise ratio (CNR), composite second order (CSO) and composite triple beat (CTB) were obtained over a 50-km single mode fiber (SMF) transmission without optical amplification. Our proposed repeaterless directly modulated fiber optical CATV transport systems are simpler and cost lower than conventional externally modulated ones.
Fatigue testing of micromachined single-crystal silicon was performed using a test system that allowed simultaneous testing of multiple samples. The on-chip test structure, including an actuator, was fabricated using 0.6µm resolution lithography to improve the morphological uniformity of the samples. Fatigue test results exhibited a clear tendency for the lifetime to lengthen when the strain amplitude or ambient humidity was decreased. The strain-life relationship at 50%RH was analyzed using the Paris law, and a crack propagation exponent of 19 was obtained.
In this paper, a low-power ultra- wideband (UWB) low-noise amplifier (LNA) is proposed. Here, we propose a structure to combine the common gate with band pass filters, which can reduce parasitic capacitance of the transistor and to achieve input wideband matching. The π-section LC network technique is employed in the LNA to achieve sufficient flat gain. A bias resistor of large value is placed between the source and the body nodes to prevent body effect and reduce noise. Numerical simulation based on TSMC 0.18µm 1P6M process. It achieved 10.0∼12.4dB gain from 3GHz to 10.6GHz and 3.25dB noise figure in 8.5GHz, operates from 1.5V power supply, and dissipates 3mW without the output buffer.
In this paper, a super ultra-wideband (UWB) bandpass filter (BPF) with frequency bandwidth from 3.0GHz to 22.5GHz (-10dB-return loss bandwidth), which is much wider than that of the conventional UWB BPF, was proposed and demonstrated. The filter employed a simple and compact broadside-coupling structure. Simulation, fabrication, and measurement were carried out. The developed filter has good performance: 0.74dB insertion loss at central frequency (about 12.5GHz), and 0.2ns group delay over main passband. It was confirmed in this work that the conventional technique of multistage was applicable to improve the skirt performance, even for such a super wide bandwidth. To author's best knowledge, the developed super UWB BPF is the widest bandwidth filter in the world.
A low power high performance level converter circuit is presented. The performance and the robustness of this level converter are compared to those of the previous level converters using HSPICE simulations in a 65nm standard CMOS technology. The results of the comparison with the previously proposed circuits show 63%, 33%, 35%, and 8% reduction in the average power, the static power, the delay, and the area, respectively.