• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.22 no.7
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• pp.729-736
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• 2011

In this paper, we propose a varactor-diodeless voltage-controlled oscillator operating at X-band, and verify the possibility of applying to a receiver for microwave radar signal detection applications. The proposed VCO is realized by only single RF BJT device as a varactor diode is substitued by a intrinsic collector-base PN-junction of the active device which is used to generate negative resistance. The fabricated VCO meets the specification of the receiver, which has a 11.20~11.75 GHz tuning bandwidth with respect to the tuning voltage, 1.0~7.0 V, output power of 9.0~12.0 dBm and linear frequency tuning performance.

• Proceedings of the Korea Electromagnetic Engineering Society Conference
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• 2003.11a
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• pp.100-103
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• 2003

A Ku-band Push-push VCO for low cost applications is proposed. The proposed push-push oscillator achieves a wide tuning range in Ku-band by the collector bias tuning instead of extra varactor diodes. The measurement shows a wide tuning range of 900MHz, fundamental suppression of -30dBc and good phase noise of -115dBc@1MHz offset.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.16 no.4 s.95
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• pp.345-350
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• 2005

An X-band push-push VCO for low cost applications is proposed. The designed push-push oscillator achieves a wide tuning range in the X-band by the collector bias tuning instead of extra varactor diodes. The measurement shows a wide tuning bandwidth of $900\;\cal{MHz}\;from\;10.9\;\cal{GHz}\;to\;11.8\;\cal{GHz}$ with a drain bias voltage varying from 4 to 9 V, excellent fudamental suppression of $-30\;\cal{dBc}$ and good phase noise of $-115\;\cal{dBc/Hz}\;@\;1\;\cal{MHz}$ offset.

• Proceedings of the KIEE Conference
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• 2001.07d
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• pp.2579-2581
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• 2001

넓은 가변 범위를 가지는 LC 탱크 전압 제어 발진기에 관해 본 논문에서 소개하고자 한다. LC 탱크 전압 제어 발진기의 발진을 소멸시키는 밀러 증폭기의 ESR을 제거함으로써 넓은 가변 범위를 얻을 수 있다. LC 탱크 전압 제어 발진기는 발진기 코어와 버퍼, 밴드갭(bandgap) 기준 전압 발생기 그리고 드라이브 증폭기로 구성되어 있다. 발진기 코어는 1.3mA의 전류를 소모하고 약 1GHz의 가변 범위를 가진다. 출력주파수의 가변 범위내에 발진기의 출력 전력은 3dBm 이내로 변한다. 이러한 LC 탱크 전압 제어 발진기는 BiCMOS 공정을 이용하여 제작되었고 2.7V 단일 전원에서 31.5mW의 전력을 소모한다.