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We developed an ON/OFF pulse modulator IC using 0.1-mum-gate-length InP HEMTs for ultra-wideband impulse radio (UWB-IR) communications systems. The IC generated extremely short pulses whose full width at half maximum (FWHM) were 6.5 ps. Furthermore, our new circuit architecture that retimes output pulses at both rising and falling edges made the IC robust against timing fluctuations or jitter. The...
A full-rate multiplexer (MUX) with a multiphase clock architecture for over 40 Gbit/s optical communication systems is presented. The 4:1 MUX is comprised of a re-timer based on a D-type flip-flop (DFF) and a clock tree system that uses EXOR-type delay buffers to match its skews well to those of the data. The supply voltage is reduced to -1.5 V by analyzing the voltage allocation. Fabricated in a...
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