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We have developed an IC chipset for 10 Gb/s optical transmission systems using high-speed and reliable InGaP/GaAs HBTs. The amplifiers showed over 10 GHz bandwidth and the decision circuit showed a very small decision ambiguity of 6 mV at 10 Gb/s. Using these ICs, we achieved an optical receiver sensitivity of -19.6 dBm, and -36.2 dBm (Pe=10/sup -12/) with(More)
To determine the purity (q) of Ca-chelating agents (such as EGTA and BAPTA) and their apparent stability constants to Ca2+ (K') using Ca(2+)-selective electrodes precisely, we have developed a new method using the double-log optimization. Free Ca2+ concentration was plotted against the ratio of the concentrations of Ca(2+)-bound to Ca(2+)-free chelator on(More)
In this paper, a composite right/left-handed (CRLH) slab-type material excited by plane wave is proposed. It is composed of multilayer metallic patterns between dielectric substrates. The equivalent circuit is shown to design a balanced CRLH material. The balanced CRLH characteristics are measured. Next the CRLH material composed of four kinds of cells with(More)
In this paper, an equivalent circuit of a fishnet-type material composed of multilayer metallic patterns is proposed. The fishnet-type material can be considered as a rectangular waveguide with stubs, and the operation principles can be simply and clearly explained by a proposed equivalent circuit. Proposed equivalent circuit can be useful for analyzing and(More)
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