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광대역 저잡음 CMOS VCO를 위한 Inductor 설계 Issue
류성한(Seonghan Ryu) 한국정보기술학회 2015 한국정보기술학회논문지 Vol.13 No.9
An inductor structure for low phase noise CMOS VCO with wide tuning range is proposed in this paper. The proposed inductor is designed to have both low inductance for wide tuning range and high quality factor for low phase noise, and is implemented as a planar spiral inductor and a 3-D bondwire inductor structure considering a frequency bandwidth, a phase noise specification and a chip size. To prove the performance of the proposed inductor structure, two CMOS VCOs are designed, fabricated and measured. RFID VCO shows the tuning range of 415MHz for 1.7GHz carrier, the phase noise of -120.7dBc/Hz at 200KHz offset and the power consumption of 21mA for 1.8V. WCDMA shows the tuning range of 1GHz for 3.7GHz carrier, the phase noise of -130.1dBc/Hz at 3MHz offset and the power consumption of 7.5mA for 1.3V. Two VCOs satisfy each standard specification and a FOM is -184.1 for RFID VCO, -181.7 for WCDMA VCO, which shows good performance of the proposed inductor VCOs.
W-band Downconversion Mixer with Finline Transition for Intelligent Traffic System
Seonghan Ryu(류성한) 한국정보기술학회 2016 한국정보기술학회논문지 Vol.14 No.10
A W-band MMIC mixer using 0.15-㎛ T-gate GaAs pHEMT technology is presented. The proposed mixer is designed as a single balanced diode mixer type with schottky barrier diode and implemented with finline transition for 77-㎓ intelligent traffic system(ITS) transceiver(TRx) module. The mixer also includes an IF amplifier to increase a conversion gain, and the waveguide-to-microstrip antipodal finline transition is designed with cosine-squared taper function curve and fabricated with duroid 5880 substrate. The optimized finline transition shows the measured insertion loss of less than 1㏈ and the return loss of higher than 20㏈ for 77㎓. The measured conversion gain of the proposed W-band mixer is 0.3㏈ at LO power of 11㏈m, which satisfies the mixer specification for ITS automotive collision avoidance radar receiver module.