Namhyung Kim

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A 130-GHz OOK transmitter has been developed based on a 65-nm CMOS technology in this work. The transmitter is composed of a 130-GHz fundamental oscillator and a switch-based OOK modulator. The oscillator is based on an LC cross-coupled differential pair with a tapered buffer, while the switch adopts a 3-stage shunt configuration. The on/off power ratio of(More)
Challenges in the implementation of THz circuits based on Si-based technologies such as Si CMOS and SiGe HBT technologies are overviewed in this paper. Major challenges described in this work include the operation speed of Si devices, loss of Si substrate, model accuracy, uncertainty in EM simulation, and the presence of dummy patterns. Possible techniques(More)
Two 122-GHz phase-locked loops (PLLs) have been developed based on a 65-nm Si CMOS technology, and their performances are compared. For the first PLL, a voltage-controlled oscillator (VCO) with a frequency doubler embedded in the oscillator core was employed (PLL1), while the second PLL employs a push-push VCO (PLL2). The output powers of PLL1 and PLL2 were(More)
Only a very limited amount of the high theoretical energy density of LiCoO2 as a cathode material has been realized, due to its irreversible deterioration when more than 0.6 mol of lithium ions are extracted. In this study, new insights into the origin of such low electrochemical reversibility, namely the structural collapse caused by electrostatic(More)
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