Joo-Myoung Kim

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This brief presents a low-voltage and low-noise ring voltage-controlled oscillator (VCO) where the phase noise performance is improved by reducing the total channel thermal noise injected into the output node of the VCO during the transition period of the output voltage swing. Implemented in a 65-nm CMOS technology, the proposed ring VCO operates from 485.7(More)
With growing interest in the internet-of-things (IoT), there has been increasing demand for wireless transmission of information captured by various sensors with minimum power dissipation, which is difficult to achieve with existing solutions such as Zigbee and Bluetooth-LE. Accordingly, there has been a high demand for an ultra-low power (ULP) transceiver(More)
This paper presents a low power, low complexity IR-UWB radar transceiver for short range object detection. The transceiver provides robustness against false alarms without increasing power consumption, chip size, or complexity. The receiver (RX) and the transmitter (TX) dissipate only 50 pJ/pulse and 470 pJ/pulse under a 1.2V supply, respectively. The(More)
A low-voltage differential Colpitts VCO that achieves an output voltage swing above the supply voltage and below the ground potential to improve the phase noise while requiring no additional inductor for a small chip area is proposed. Implemented in a 65nm CMOS process, the proposed VCO achieves the phase noise of -131.05dBc/Hz at an offset of 1MHz from an(More)
A high-speed and low-power adaptable period SAR-based DAC gain calibration is presented for DSM quantization noise suppression, which completes within 10μs while dissipating 0.2mW. The proposed calibration scheme is applied to the fractional-N type frequency synthesizer which adopts an 8-bit noise-cancelling DAC. The frequency synthesizer has a range(More)
An ultra-low power and wide tuning range LC-VCO is presented, where the performances are improved by identifying and avoiding the Q-factor degradation factors in the LC-tank. By the positioning analysis and adoption of MIM capacitor arrays along with minimum size varactors, the proposed VCO with a high-Q inductor, implemented in a 65-nm CMOS technology,(More)
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