- Director of Multifunctional Integrated Circuits & Systems (MICS)
- Mixed-Signal, RF and mm-Wave ICs for Comms & Imaging
- RF and mm-Wave SoCs
- RF, mm-Wave and THz Circuits for Next-G Communication
- Direct Digital Beamforming
- H. M. Nguyen, J. S. Walling, A. Zhu and R. B. Staszewski, "A mm-Wave Switched-Capacitor RFDAC," in IEEE Journal of Solid-State Circuits, doi: 10.1109/JSSC.2022.3142718.
- Y. Chiu, M. -K. Law, N. Krishnapura, J. T. Stauth and J. S. Walling, "Guest Editorial Introduction to the Special Issue on the 2021 IEEE International Solid-State Circuits Conference (ISSCC)," in IEEE Journal of Solid-State Circuits, vol. 56, no. 12, pp. 3547-3550, Dec. 2021, doi: 10.1109/JSSC.2021.3121154.
- H. M. Nguyen, J. S. Walling, A. Zhu and R. B. Staszewski, "A Ka-band Switched-Capacitor RFDAC Using Edge-Combining in 22nm FD-SOI," 2021 Symposium on VLSI Circuits, 2021, pp. 1-2, doi: 10.23919/VLSICircuits52068.2021.9492451.
- B. Qiao, A. V. Kayyil, J. S. Walling and D. J. Allstot, "I/Q-Sharing Switched-Capacitor Power Amplifier with Baseband Harmonic-Rejection and Wilkinson Combiner," 2021 IEEE International Symposium on Circuits and Systems (ISCAS), 2021, pp. 1-4, doi: 10.1109/ISCAS51556.2021.9401455.
- F. Zhang, P. Chen, J. S. Walling, A. Zhu and R. B. Staszewski, "An Active-Under-Coil RFDAC With Analog Linear Interpolation in 28-nm CMOS," in IEEE Transactions on Circuits and Systems I: Regular Papers, vol. 68, no. 5, pp. 1855-1868, May 2021, doi: 10.1109/TCSI.2021.3059368.
- A. Azam, Z. Bai and J. S. Walling, "An Ultra-Low Power CMOS Integrated Pulse-Width Modulated Temperature Sensor," in IEEE Sensors Journal, vol. 21, no. 2, pp. 1294-1304, 15 Jan.15, 2021, doi: 10.1109/JSEN.2020.3019324.
- A. Azam, Z. Bai and J. S. Walling, "Leveraging Programmable Capacitor Arrays for Frequency-Tunable Digital Power Amplifiers," in IEEE Transactions on Microwave Theory and Techniques, vol. 68, no. 6, pp. 1983-1994, June 2020, doi: 10.1109/TMTT.2020.2976921.
- S. Yoo, S. Hung, J. S. Walling, D. J. Allstot and S. Yoo, "10.7 A 0.26mm2 DPD-Less Quadrature Digital Transmitter With <−40dB EVM Over >30dB Pout Range in 65nm CMOS," 2020 IEEE International Solid- State Circuits Conference - (ISSCC), 2020, pp. 184-186, doi: 10.1109/ISSCC19947.2020.9063070.
- J. S. Walling, "The Switched-Capacitor Power Amplifier: A Key Enabler for Future Communications Systems," ESSCIRC 2019 - IEEE 45th European Solid State Circuits Conference (ESSCIRC), 2019, pp. 18-24, doi: 10.1109/ESSCIRC.2019.8902890.
- Z. Bai, A. Azam and J. S. Walling, "A Frequency Tuneable Switched-Capacitor PA in 65nm CMOS," 2019 IEEE Radio Frequency Integrated Circuits Symposium (RFIC), 2019, pp. 295-298, doi: 10.1109/RFIC.2019.8701790.
- Z. Bai, W. Yuan, A. Azam and J. S. Walling, "4.3 A Multiphase Interpolating Digital Power Amplifier for TX Beamforming in 65nm CMOS," 2019 IEEE International Solid- State Circuits Conference - (ISSCC), 2019, pp. 78-80, doi: 10.1109/ISSCC.2019.8662430.
- K. D. Holzer and J. S. Walling, "1-to- $N$ Ring Power Combiners With Common Delta Ports," in IEEE Transactions on Circuits and Systems I: Regular Papers, vol. 66, no. 4, pp. 1431-1441, April 2019, doi: 10.1109/TCSI.2018.2886286.