• 전력전자학회:학술대회논문집
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• 전력전자학회 2010년도 추계학술대회
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• pp.198-199
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• 2010

In this paper, bi-directional DC/DC converter using a LC series resonant converter is proposed. A proposed converter is consisted by adding LC series resonant tank into a conventional bi-directional DC/DC converter and performs soft-switching at both boost and buck mode. A LC series resonance occurs in whole operation mode and switching point is determined by specific condition. Through the theoretical analysis and simulation results, operation modes and characteristics of the proposed topology is verified.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2009년도 정기총회 및 추계학술대회 논문집
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• pp.237-239
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• 2009

This paper presents a new developed 160kV-120kW Class MPC (magnetic pulse compressor) power supply for DeNOx, DeSOx system. The circuit consists of N-series connected CCPS (capacitor charging power supply) and MPC Tank. The MPC power supply developed compared to the conventional LC resonant type has many advantage, it was verified reliability of a product by module, simulator and tank connection test. Now, the developed MPC power supply is installed POSCO sintering plant for DeSOx, DeNOx system.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2008년도 하계학술대회 논문집
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• pp.157-159
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• 2008

Generally, Capacitor charging power supply (CCPS) consist of the full-bridge inverter, LC resonant tank and capacitance load. The multi-connection systems are normally used for high voltage or high power application. In this paper, conventional parallel operation resonant type and proposed series operation PWM type CCPS for pulse corona occurrence of DeSOx, DeNOx system using magnetic pulse compressor make a comparison. The effect of proposed CCPS is verified by circuit characteristics analysis of parallel operation resonant type and series operation PWM type, and it is confirmed by simulation result.

• International Journal of Internet, Broadcasting and Communication
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• 제15권3호
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• pp.122-128
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• 2023

This paper proposes two kinds of single-balanced direct conversion quadrature receivers using selfoscillating LMVs in which the voltage-controlled oscillator (VCO) itself operates as a mixer while generating an oscillation. The two LMVs are complementary coupled and series coupled to generate the quadrature oscillating signals, respectively. Using a 65 nm CMOS technology, the proposed quadrature receivers are designed and simulated. Oscillating at around 2.4 GHz frequency, the complementary coupled quadrature receiver achieves the phase noise of -28 dBc/Hz at 1KHz offset and -109 dBc/Hz at 1 MHz offset frequency. The other series coupled receiver achieves the phase noise of -31 dBc/Hz at 1KHz offset and -109 dBc/Hz at 1 MHz offset frequency. The simulated voltage conversion gain of the two single-balanced receivers is 37 dB and 45 dB, respectively. The double-sideband noise figure of the two receivers is 5.3 dB at 1 MHz offset. The quadrature receivers consume about 440 μW dc power from a 1.0-V supply.

• International journal of advanced smart convergence
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• 제10권1호
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• pp.12-23
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• 2021

This paper proposes a low power radio frequency receiver front-end where, in a single stage, single-balanced mixer and voltage-controlled oscillator are stacked on top of low noise amplifier and re-use the dc current to reduce the power consumption. In the proposed topology, the voltage-controlled oscillator itself plays the dual role of oscillator and mixer by exploiting a series inductor-capacitor network. Using a 65 nm complementary metal oxide semiconductor technology, the proposed radio frequency front-end is designed and simulated. Oscillating at around 2.4 GHz frequency band, the voltage-controlled oscillator of the proposed radio frequency front-end achieves the phase noise of -72 dBc/Hz, -93 dBc/Hz, and -113 dBc/Hz at 10KHz, 100KHz, and 1 MHz offset frequency, respectively. The simulated voltage conversion gain is about 25 dB. The double-side band noise figure is -14.2 dB, -8.8 dB, and -7.3 dB at 100 KHz, 1 MHz and 10 MHz offset. The radio frequency front-end consumes only 96 ㎼ dc power from a 1-V supply.

• 한국인터넷방송통신학회논문지
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• 제24권2호
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• pp.139-145
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• 2024

본 논문에서는 VCO 이득(Kvco) 변화가 작은 현대 무선 통신 시스템의 핵심 구성 요소 중 하나인 전압 제어 발진기(VCO)의 설계를 제시하였다. 기존의 큰 Kvco 변화를 보상하기 위해 병렬 커패시터 뱅크 어레이가 있는 기존 LC-탱크에 직렬 배랙터 뱅크가 추가되었다. 또한 넓은 튜닝 범위를 유지하면서 우수한 위상 잡음 성능을 달성하기 위해 혼합 거친/미세 튜닝 방식(직렬 배랙터 어레이 및 병렬 커패시터 어레이)이 선택되었다. 스위치드 배랙터 어레이 뱅크는 추가 디지털 회로 없이 스위치드 커패시터 어레이에 대해 동일한 디지털 코드에 의해 제어됩니다. 1.2V의 낮은 전압에서 사용하기 위해 본 논문에서 제안된 전류 참조 회로는 공통 게이트를 보다 안전하게 제거한 안전성을 위해 전류 참조 회로를 사용하였다. TSMC 0.13 ㎛ CMOS RF 기술로 구현된 제안된 VCO는 9.6% 미만의 Kvco(VCO 이득) 변화로 4.4GHz에서 5.3GHz로 조정할 수 있다. 1.2V 공급에서 3.1mA를 소비하는 동안 VCO는 5.3GHz의 반송파에서 오프셋 1MHz에서 -120dBc/Hz 위상 잡음을 갖을 수 있었다.