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InP MZ modulator of sub 1-Vpp driving voltage with quasi-traveling-wave electrode structure and Logic IC of 90-nm CMOS process as its driver were developed. Their applicability was demonstrated through 10-Gb/s - 80-km transmission over full C-band.
We propose a power management method using a digital voice activity detection (VAD) module for intelligent ubiquitous sensor systems. When this VAD module detects a speech signal, a main signal processing circuit is connected to a power source. When no speech signal is detected, most circuits except VAD are blocked off, thereby reducing stand-by power for the specialized sensor nodes used for speech...
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