한국전기전자재료학회:학술대회논문집 (Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference)
- 한국전기전자재료학회 2006년도 추계학술대회 논문집 Vol.19
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- Pages.127-128
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- 2006
InGaP/GaAs HBT 기술을 이용한 GPS대역 LC-VCO 설계에 관한 연구
Design of a LC-VCO using InGap/GaAs HBT Technology for an GPS Application
- Choi, Young-Gu (Kwangwoon Univ.) ;
- Kim, Bok-Ki (Kwangwoon Univ.)
- 발행 : 2006.11.09
초록
The proposed differential LC cross-coupled VCO is implemented in InGap/GaAs HBT process for an adaptive Global Positioning system(GPS) application. Two filtering capacitors are used at the base of output buffer amplifiers at the both sides of the core m order to improve phase noise characteristics. The VCO produced a phase noise of -133 dBc/Hz at 3MHz offset frequency from the carrier frequency of 1.489GHz and the second harmonic suppression is significantly suppresed up to -49dBc/Hz in simulation result. The three pairs of BC diodes are integrated m the tank circuit to increase the VCO Tunning range.