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가변 피드포워드 Gm을 이용해 적응형 Quiescent 전류 제어 기법을 적용한 출력 커패시터가 없는 LDO 레귤레이터
성은택(Eun-Taek Sung),박상용(Sangyong Park),이승기(Seung-Gi Lee),백동현(Donghyun Baek) 대한전자공학회 2015 대한전자공학회 학술대회 Vol.2015 No.6
An adaptive quiescent-current controlled LDO using a variable feedforward Gm cell is proposed. For a light load, the feedforward Gm increases and moves the non-dominant pole to a higher frequency. For a heavy load, Gm decreases to enhance the maximum efficiency of the LDO. The proposed LDO achieves a maximum current efficiency of 99.98 % with a worst case phase margin of 61.2 degree.
Low Phase Noise Series-coupled VCO using Current-reuse and Armstrong Topologies
류혁,하금원,성은택,백동현 대한전자공학회 2017 Journal of semiconductor technology and science Vol.17 No.1
This paper proposes a new series-coupled voltage-controlled oscillator (VCO). The proposed VCO consists of four current-reuse Armstrong VCOs (CRA-VCOs) coupled by four transformers. The series-coupling, current-reuse, and Armstrong topologies improve the phase noise performance by increasing the negative-Gm of the VCO core with half the current consumption of a conventional differential VCO. The proposed VCO consumes 6.54 mW at 9.78 GHz from a 1-V supply voltage. The measured phase noise is −115.1 dBc/Hz at an offset frequency of 1 MHz, and the FoM is −186.5 dBc/Hz. The frequency tuning range is from 9.38–10.52 GHz. The core area is 0.49 mm2 in a 0.13-μm CMOS process.