Noriya Kobayashi

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| In this paper we propose a data structure for abstracting the delay information of a com-binatorial circuit. The particular abstraction that we are interested in is one that preserves the delays between all pairs of inputs and outputs in the circuit. The proposed graphical data structure is of size proportional to (m + n) in best case, where m and n refer(More)
We fabricated a fully integrated WiMAX transceiver in a 90-nm CMOS that can reduce balun and matching network components on an RF module board. Output linearity of up to 12 dBm and a wide variable gain range of 60 dB were achieved using a single-ended signal interface for the PA driver of the transmitter. A combination of a class AB amplifier and a class C(More)
The work presented here proposes local I/Q phase correction and carrier leakage suppression techniques for WiMAX transceivers. Local I/Q calibration was able to compensate for process and supply voltage variations, and the measured I/Q phase errors after calibration are within 3 degrees. The measured carrier leakage after calibration substantially meets(More)
We fabricated a multiband transceiver for mobile WiMAX in 90-nm CMOS technology. It operates at three RF bands (2.3/2.5/3.5 GHz) with a large dynamic range. We adopted a double conversion receiver that can switch lower and upper local modes. An image rejection ratio (IRR) tunable single side-band (SSB) mixer was used to achieve over 50 dB IRR. The RCE for(More)
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