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Low‐phase‐noise high‐efficiency MMIC VCO based on InGaP/GaAs HBT with the LC filter
Author(s) -
Myoung SeongSik,
Yook JongGwan
Publication year - 2004
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.20564
Subject(s) - dbc , phase noise , voltage controlled oscillator , heterojunction bipolar transistor , offset (computer science) , monolithic microwave integrated circuit , materials science , electrical engineering , microwave , lc circuit , figure of merit , electronic engineering , optoelectronics , engineering , telecommunications , transistor , voltage , computer science , capacitor , amplifier , bipolar junction transistor , cmos , programming language
This paper presents a fully integrated low‐phase‐noise and high‐efficiency VCO based on InGaP/GaAs HBT, which shows excellent power‐efficiency performance, for 802.11a application. For improved phase‐noise performance, an LC filtering technique is adapted. The measured phase noise is −87.8 dBc/Hz at 100‐kHz offset frequency and −111.4 dBc/Hz at 1‐MHz offset frequency. The phase‐noise characteristic is shown to improve by 5 dB after employing the LC filter. The figure of merit (FOM), defined as a function of the phase noise and power efficiency of the fabricated VCO with LC filter, is −172.1 dBc/Hz, which is the best result among the 5‐GHz low‐phase‐noise VCOs. © 2004 Wiley Periodicals, Inc. Microwave Opt Technol Lett 44: 123–126, 2005; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.20564