MSc thesis project proposal
Cryogenic Ultra-Wideband Quadrature Coupler (Intel)Designing control and read-out electronics at cryogenic temperatures for a scalable quantum computer requires RF circuit blocks operating at 4 Kelvin . One of the key circuit blocks is a quadrature coupler which is used in image-reject mixers , balanced amplifiers , etc. Most of the on-chip quadrature couplers are not wideband which is essential for multi-qubit operation.
• Design of highly reconfigurable quadrature coupler operating between 6-12 GHz operating at 4 Kelvin
• Coupler phase imbalance < 1 0 and gain imbalance < 0.5 dB (3 dB power split)
Key skills acquired:
• Designing RFIC in TSMC 40-nm CMOS
• Measurement of RF circuits at cryogenic temperatures in state-of-the-art cryogenic RF lab
• Part of an interdisciplinary research group of circuit designers working in the field of quantum computing
 B. Patra et al., "Cryo-CMOS Circuits and Systems for Quantum Computing Applications," in IEEE Journal of Solid-State Circuits, vol. 53, no. 1, pp. 309-321, Jan. 2018.
 D. Ozis, J. Paramesh and D. J. Allstot, "Integrated Quadrature Couplers and Their Application in Image-Reject Receivers," in IEEE Journal of Solid-State Circuits, vol. 44, no. 5, pp. 1464-1476, May 2009.
 H. Jeon et al., "A Triple-Mode Balanced Linear CMOS Power Amplifier Using a Switched-Quadrature Coupler," in IEEE Journal of Solid-State Circuits, vol. 47, no. 9, pp. 2019-2032, Sept. 2012.
 M. A. Y. Abdalla, K. Phang and G. V. Eleftheriades, "A Compact Highly Reconfigurable CMOS MMIC Directional Coupler," in IEEE Transactions on Microwave Theory and Techniques, vol. 56, no. 2, pp. 305-319, Feb. 2008.
 J. Sun, C. Li, Y. Geng and P. Wang, "A Highly Reconfigurable Low-Power CMOS Directional Coupler," in IEEE Transactions on Microwave Theory and Techniques, vol. 60, no. 9, pp. 2815-2822, Sept. 2012.
 H. Hsieh, Y. Liao and L. Lu, "A Compact Quadrature Hybrid MMIC Using CMOS Active Inductors," in IEEE Transactions on Microwave Theory and Techniques, vol. 55, no. 6, pp. 1098-1104, June 2007.
dr. Masoud Babaie
Electronic Circuits and Architectures Group
Department of Microelectronics
Last modified: 2019-01-24