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Adjunct Associate Professor, Elect & Computer Engineering
Publications
- K. Holzer and J. S. Walling, “A multi-channel outphasing ring combiner for multi-mode output and channel aggregation,” Proc. of the European Microwave Conf., pp. 516-519, October 2016.
Published, 10/2016.
- Z. Bai, A. Azam, D. Johnson, A. Saha and J. S. Walling, “A 12 Bit Split-Array Switched Capacitor Power Amplifier in 130nm CMOS,” Proc. of the IEEE SOC Conf., pp. 1-4, September 2016.
Published, 09/2016.
- I. Chigrev, P. Spasojevic and J. Walling, “A 26mW, two-stage VCO and mixer for direct DPSK conversion in MedRadio,” Proc. of the IARIA Intl. Conf. on Wireless and Mobile Communications, October 2015, pp. 84-87.
Published, 10/2015.
- A. M. Imtiaz, J. S. Walling and F. H. Khan, “Contour mode ring-shaped AlN micro-resonator on Si and feasibility of its application in series resonant converter,” IEEE Trans. Power Electronics, pp. 4437-4454, August 2015.
Published, 08/2015.
- W. Yuan and J. S. Walling, “A switched-capacitor controlled digital-current modulated class-E EER transmitter,” IEEE NEWCAS, pp. 1-4, June 2015.
Published, 06/2015.
- W. Yuan, V. Aparin, J. Dunworth, L. Seward and J. S. Walling, “A quadrature switched capacitor power amplifier in 65nm CMOS,” IEEE Radio Frequency Integrated Circuits Symposium (RFIC), pp. 135-138, May 2015.
Published, 05/2015.
- A. R. Reyhani, C. Jayanthmurthy, B. Gillman, J. S. Walling, J. Belz and B. Farhang-Boroujeny, “An analog adaptive notch filter based on the noise cancellation principle,” IEEE International Symposium on Circuits and Systems, pp. 2660-2663, May 2015.
Published, 05/2015.
- K. Holzer and J. S. Walling, “A 1 W GaAs class-E power amplifier with an FBAR filter output matching network,” IET Journal of Engineering, pp. 1-3, May 2015.
Published, 05/2015.
- A. M. Imtiaz, F. H. Khan and J. S. Walling, “Fabrication, characterization and efficiency analysis of a piezoelectric (AlN) ring micro-resonator on Si for low-power resonant converters,” Proc. of the IEEE IECON, October 2014.
Published, 10/2014.
- K. Holzer and J. S. Walling, “A one octave, 20 W GaN Chireix Power Amplifier,” Proc. of IEEE WAMI Conference, June 2014.
Published, 06/2014.
- A. Imtiaz, F. Khan and J. S. Walling, “Contour mode piezoelectric ring microresonators on Si for series resonant converters,” Proc. of the Applied Power Electronics Conf., pp. 2593-2599, March 2014.
Published, 03/2014.
- T. Vu, A. Baid, S. Gao, M. Gruteser, R. Howard, J. Lindqvist, P. Spasojevic and J. Walling, “Capacitive touch communication: a technique to input data through device’s touchscreen,” IEEE Trans. on Mobile Computing, vol. 13, pp. 4-19, Jan. 2014.
Published, 01/2014.
http://www.computer.org/csdl/trans/tm/2014/01/ttm2...
- S. Yoo, J. S. Walling, B. Jann, O. Degani, J. C. Rudell, R. Sadhwani and D. J. Allstot, “A Class-G Switched Capacitor RF Power Amplifier,” IEEE J. Solid-State Circuits, vol. 48, pp. 1212-1224, May 2013.
Published, 05/2013.
- J. S. Walling and D. J. Allstot, “Design considerations for supply-modulated EER power amplifiers,” Proc. of the IEEE WAMI Conference, Apr. 2013.
Published, 04/2013.
- S. Sehajpal, D. J. Allstot, S. S. Taylor and J. S. Walling, “Impact of switching glitches in class-G power amplifiers,” IEEE Microwave and Wireless Component Letters, vol. 22, pp. 282-284, June 2012.
Published, 06/2012.
- J. S. Walling, S. Yoo and D. J. Allstot, “Digital power amplifiers: exploiting the switched capacitor circuit,” IEEE Communications Magazine, vol. 40, pp. 145-151, April 2012.
Published, 04/2012.
- S. Yoo, J. S. Walling, E. Woo B. Jann and D. J. Allstot, “A switched-capacitor RF power amplifier,” IEEE J. Solid-State Circuits, vol. 46, pp. 2977-2987, December 2011.
Published, 12/2011.
- J. S. Walling and D. J. Allstot, “Pulse-width modulated CMOS power amplifiers,” IEEE Microwave Magazine, vol. 12, pp. 52-60, February 2011.
Published, 02/2011.
- J. S. Walling and D. J. Allstot, “Linearizing CMOS switching power amplifiers using supply regulators,” IEEE Trans. Circuits and Systems II: Express Briefs, vol. 57, pp. 497-501, July 2010.
Published, 07/2010.
- J. S. Walling, S. S. Taylor and D. J. Allstot, “A Class-G supply modulator and class-E PA in 130 nm CMOS,” IEEE J. Solid-State Circuits, vol. 44, pp. 2339-2347, September 2009.
Published, 09/2009.
- J. S. Walling, H. Lakdawala, Y. Palaskas, A. Ravi, O. Degani, K. Soumyanath and D. J. Allstot, “A class-E PA with pulse-width and pulse-position modulation in 65 nm CMOS,” IEEE J. Solid-State Circuits, vol. 44, pp. 1668-1678, June 2009.
Published, 06/2009.
- J. S. Walling, S. S. Taylor and D. J. Allstot, “Multiple supply (Class-G) linear modulator and PA for non-CE modulation,” IEEE Radio Frequency IC Symposium, June 2009, pp. 587-590.
Published, 06/2009.
- J. S. Walling, S. Shekhar and D. J. Allstot, “Wideband CMOS amplifier design: time-domain considerations,” IEEE Trans. Circuits and Systems I: Regular Papers, vol. 55, pp. 1781-1793, Aug. 2008.
Published, 08/2008.
- S. Shekhar, J. S. Walling, S. Aniruddhan and D. J. Allstot, “CMOS VCO and LNA using tuned-input and tuned-output circuits,” IEEE J. Solid-State Circuits, vol. 43, pp. 1177-1186, May 2008.
Published, 05/2008.
- J. S. Walling, H. Lakdawala, Y. Palaskas, A. Ravi, O. Degani, K. Soumyanath and D. J. Allstot, “A 28.6 dBm, 65nm class-E PA with envelope restoration by pulse-width and pulse-position modulation,” IEEE ISSCC Dig. Tech. Papers, Feb. 2008, 566-567.
Published, 02/2008.
- D. J. Allstot, S. Aniruddhan, M. Chu, N. M. Neihart, D. Ozis, S. Shekhar and J. S. Walling, “Low phase noise CMOS voltage-controlled oscillators,” Intl. Conf. on ASIC, Oct. 2007, pp. 297-302.
Published, 10/2007.
- J. S. Walling, S. Shekhar and D. J. Allstot, “A gm-boosted, current-reuse LNA in 0.18 m CMOS,” IEEE Radio Frequency IC Symposium, June 2007, 613-616.
Published, 06/2007.
- J. S. Walling and D.J. Allstot, “Monolithic spiral transformers: a design methodology,” IEEE International Symposium on Circuits and Systems, May 2007, pp. 3351-3354.
Published, 05/2007.
- S. Shekhar, J. S. Walling and D. J. Allstot, “Bandwidth extension techniques for CMOS amplifiers,” IEEE J. Solid-State Circuits, vol. 41, pp. 2424-2439, Nov. 2006.
Published, 11/2006.
- D.J. Allstot, C.T. Charles, S. Kodali, X. Li, D. Ozis, J. Paramesh, S. Shekhar, and J. S. Walling, “CMOS integrated transformers: coming of age,” Intl. Conf. on Solid-State and Integrated Circuit Technology, Oct. 2006, pp. 1480-1483.
Published, 10/2006.
- D. J. Allstot, C. T. Charles, D. Ozis, S. Shekhar and J. S. Walling, “RF CMOS design: living with the substrate,” IEEE International Microwave Symposium Workshop: Substrate Effect in Si RFIC Interconnects, 2006, pp. 48-66.
Published, 05/2006.
- J. S. Walling and D. J. Allstot, “A 25 dBm, 35 % PAE, 7-12 GHz power amplifier utilizing techniques to increase optimal load impedance,” IEEE Topical Workshop on Power Amplifiers, Jan. 2006, pp. 35-36.
Published, 01/2006.
Presentations
- Enabling Digital Beamforming with the SCPA, University of Colorado ECE Department Seminar, Boulder, CO.
Other,
Presented, 12/14/2017.
- Enabling Digital Beamforming with the Switched Capacitor Power Amplifier, Ming Hsieh Institute Seminar Series on Integrated Systems, University of Southern California, Los Angeles, CA.
Other,
Presented, 10/27/2017.
https://2qfdd1ot4k08vlhu482uv913-wpengine.netdna-s...
- Digital TX Revolutions: From Polar to Multiphase SCPAs, Texas A&M University ECE Seminar, College Station, TX—November 2016.
Other,
Presented, 11/2016.
- Digital TX Revolutions: From Polar to Multiphase SCPAs, Columbia University ECE Seminar, New York, NY—October 2016.
Other,
Presented, 10/2016.
- Digital TX Revolutions: From Polar to Multiphase SCPAs, IEEE SSCS Meeting, Vancouver, BC—June 2016.
Invited Talk/Keynote,
Presented, 07/2016.
- Capacitively Coupled Quadrature Switched Capacitor PAs, UCSD PA Workshop: San Diego, CA—September 2015
.
Invited Talk/Keynote,
Presented, 09/2015.
- Class-G From Analog to Digital, RFIC 2015 WSE Workshop: Phoenix, AZ—May 2015.
Invited Talk/Keynote,
Presented, 05/2015.
- Linearizing Power Amplifiers with Class-G Analog Voltage Supply Modulators, RFIC 2015 WSB Workshop: Phoenix, AZ—May 2015.
Invited Talk/Keynote,
Presented, 05/2015.
- IEEE SSCS Utah Chapter Fall Meeting (Two Seminars): The Ubiquitous Switched Capacitor Circuit and its Applications in RFPAs
and Design and Linearization of Switching Power Amplifiers.
Invited Talk/Keynote,
Presented, 10/31/2014.
- Iowa State ECE Department Seminar: Energy Efficient GaN PAs for Pico-Cell Base Stations.
Other,
Presented, 10/02/2014.
- RFIC 2014 WSB Workshop: Digital PAs: Switched Capacitor Circuits Pave The Way to Reconfigurability.
Other,
Presented, 06/01/2014.
- Switched Capacitor PAs: Toward Efficient, Linear Amplification, UCSD PA Workshop: San Diego, CA—September 2013.
Invited Talk/Keynote,
Presented, 09/2013.
- CMOS Switched Capacitor Circuits for RF Applications, RFIC 2012 Workshop: Montreal, Canada—June 17, 2012.
Other,
Presented, 06/17/2012.
Research Groups
- Anirban Saha, Graduate Student.
Electrical and Computer Engineering.
03/08/2015 - 12/31/2016.
- Sarvani Kunapareddy, Graduate Student.
Electrical and Computer Engineering.
09/01/2014 - 05/2016.
- Ali Azam, Graduate Student.
Electrical and Computer Engineering.
08/2014 - present.
- Zhidong Bai, Graduate Student.
Electrical and Computer Engineering.
08/2014 - present.
- Dallas Johnson, Graduate Student.
Electrical and Computer Engineering.
08/2014 - 05/01/2015.
- Michael Burbidge, Graduate Student.
Electrical and Computer Engineering.
08/2014 - 05/2016.
- Emory Enroth, Undergraduate Student.
Electrical and Computer Engineering.
04/2014 - 05/2015.
- Jason Choi, Undergraduate Student.
Electrical and Computer Engineering.
04/2014 - 05/2015.
- Ryan Goslin, Undergraduate Student.
Electrical and Computer Engineering.
04/2014 - 04/2015.
- Wangye Yin, Undergraduate Student.
Electrical and Computer Engineering.
04/2014 - 05/2015.
- Caleb Hood, Undergraduate Student.
Electrical and Computer Engineering.
04/2014 - 05/2015.
- Kyle Holzer, Graduate Student.
Electrical and Computer Engineering.
08/2013 - 05/2018.
Awards/Scholarships/Stipends: Graduated Ph. D. Spring 2018.
- Darren Korth, Graduate Student.
Electrical and Computer Engineering.
08/2013 - present.
- Wen Yuan, Graduate Student.
Electrical and Computer Engineering.
01/2013 - 05/2017.
Geographical Regions of Interest