• Journal of the Semiconductor & Display Technology
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• v.17 no.2
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• pp.53-56
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• 2018

In this paper, a CMOS bandgap voltage reference that is not sensitive to changes in the external environment is presented. Large OLED display panels need high supply voltage. MOSFET devices with high voltage are sensitive to the output voltage due to the channel length modulation effect. The self-cascode circuit was applied to the bandgap reference circuit. Simulation results show that the maximum output voltage change of the basic circuit is 77mV when the supply voltage is changed from 10.5V to 13.5V, but the proposed circuit change is improved to 0.0422mV. The improved circuit has a low temperature coefficient of $9.1ppm/^{\circ}C$ when changing the temperature from $-40^{\circ}C$ to $140^{\circ}C$. Therefore, the proposed circuit can be used as a reference voltage source for circuits that require a high supply voltage.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2003.05a
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• pp.93-96
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• 2003

본 논문은 캐스코드 구조에서의 바이어스 조건에 대해 분석하고 이를 이용하여 C-Band용 마이크로파 수신기에서의 자기발진믹서를 분석하였다. 자기발진믹서는 두 개의 FET에 의해서 동작되며 상위 FET는 비교적 높은 Q값을 가지는 유전체공진기에 의해서 발진기로 동작하도록 하였으며, 아래쪽 FET는 믹서로 동작시켰다. 모의실험 결과에 의해 초기 드레인 전압은 $V_{ds}$ =2.5V이고 게이트바이어스 전압은 $V_{gs1}$=-0.2V와 $V_{g2}$=0V로 선정하였다. 선정된 바이어스를 통해 설계된 5.15GHz의 발진기 출력은 5.92dBm, 위상잡음은 -132.0dBc/100KHz, 믹서의 변환손실은 약 -3dB를 얻었다.얻었다.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 1998.06a
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• pp.243-246
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• 1998

This paper presents a 6-bit self-calibrated D/A converter designed with current cell matrix structure. This structure is based on the current-cell matrix configuration using a regulated gate cascode current cell with 3-way switch. using from CMOS process and 5V power supply, the simulated conversion rate is 45.78MHz and the average mismatching properties among current sources are reduced to 0.02% and 0.005%, respectively when 1% and 0.5% errors of current sources are considered.

• Journal of the Korean Institute of Telematics and Electronics D
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• v.35D no.4
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• pp.1-8
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• 1998

An MMIC single-balanced upconverting mixer for PCS application has been successfully developed using an MMIC process employed by 1 .mu. ion implanted GaAs MESFET and passive lumped elements consisting of spiral inductor, Si3N4 MIM capacitors and NiCr resistors. The configuration of the mixer presented in this paper is two balanced cascode FET mixers with common-source self-bias circuits for single power supply operation. The dimension of the fabricated circuit including two active baluns intermodulation characteristic with two-tone excitation are also measured, showing -28.17 dBc at IF power of -30 dBm.

• Proceedings of the Korea Electromagnetic Engineering Society Conference
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• 2001.11a
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• pp.227-230
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• 2001

본 논문은 마이크로파 슈퍼헤테로다인 수신기에서 발생되는 이미지성분을 효과적으로 제거하기위한 Cascode형 FETs구조를 이용한 Ku-Band 이미지 제거용 자기발진믹서을 분석하였다. 자기발진믹서는 두개의 FET에 의해서 동작되며 상위 FET는 유전체공진기에 의해서 발진기로 동작하며, 아래쪽 FET는 믹서로 동작시켰다. 모의실험 결과 초기 게이트바이어스 전압은 $V_{ gsl}$=-0.4V와 $V_{g2}$=-0.4V와 $V_{g2}$V선정 하였으며, 10.75GHz의 발진기 출력은 2.249dBm, 위상잡음은 -137.9dBc/1000KHz, 이미지 제거특성은 약 -26dBc 값을 얻었다.얻었다.