Differential K-band vector modulator IC design at 180 NM CMOS SOI process

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2019

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Güngör, Ömer Fevzi

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Massive MIMO and beamforming are technologies that may enable ultrafast 5G network. They are predicted to be used widely in next-generation high capacity communication systems. In the implementation of beamforming and MIMO, the large number of antennas and RF control components are utilized. However; some challenges related to power consumption, control complexity, cost, and size of transceiver have arisen. Vector Modulator (VM) may be one possible effective solution to these challenges because it merges the tasks of both phase shifter and attenuator. In other words, VM controls both amplitude and phase of RF signal with simple control and the reasonable cost and size. In this thesis work, the design of SOI-based RFIC vector modulator is presented. VM is targeted to operate in 20-25 GHz, possible 5G band. Vector modulator consists of passive parts, which are baluns, Lange quadrature coupler, Wilkinson in-phase combiner, and active parts, which are digital step attenuator (DSA) and switch matrix. Switch matrix and DSA, which are composed of active switches and resistances, are designed and optimized with Cadence Design System. Spiral Marchand baluns, Lange quadrature coupler and Wilkinson in-phase combiner are designed and simulated with Sonnet’s 3D Electromagnetic Software. Finalized VM design is simulated and results are presented. Final design has 6.5 dB insertion loss, better than 10 dB return loss, 48 dBm IIP3, 38 dBm input P1dB, 0.5 dB amplitude and 1-degree phase resolution in active regions, where outputs can take value.

Subject Keywords

Radio frequency integrated circuits., Wireless communication systems., Microwave integrated circuits.

URI

http://etd.lib.metu.edu.tr/upload/12623033/index.pdf
https://hdl.handle.net/11511/27965

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Graduate School of Natural and Applied Sciences, Thesis

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Citation Formats

Ö. F. Güngör, “Differential K-band vector modulator IC design at 180 NM CMOS SOI process,” M.S. - Master of Science, Middle East Technical University, 2019.