RFIC Combating Interference and Self_Interference

Simultaneous Transmitting and Receiving (STAR) operations will benefit a variety of applications and boost communication efficiency. To enable STAR operations, one of the key enabling components is a highly linear transmitter with low noise and leakage to other channels and the receiving band. Besides, system robustness over PVTs are also highly demanded, which impedes the wide deployment of a majority of existing lineariztion technologies for STAR operations.  To enable STAR operations, we are investigating a new linearization scheme, Cartesian Error Feedback Transmitter (CEFTx) architecture by introducing a feed-forward path to cancel the signal before feedback, therefore alleviating the linearity-noise trade-offs inherent in conventional Cartesian Feedback Transmitters.

Figure above presents some of the work related to this research effort, with the particular highlight of the first presentation of low noise Cartesion loop transmitter which demonstrates better than -131 dBm/Hz noise density at 100 MHz offset while enjoying the high linearity and robustness versus PVT changes.

Publications

  1. J. Li, R. Shu, Z. Xu, and Q. J. Gu, “A 21dm-OP1dB 20.3%-Efficiency -131.8dBm/Hz-Noise X-band Cartesian-Error-Feedback Transmitter with Fully Integrated Power Amplifier in 65nm CMOS,” Accept JSSC, Nov. 2019
  2. J. Li, R. Shu, Q. J. Gu, “An 8.5-11 GHz CMOS Transmitter with >19 dBm OP1dB and 24 % Efficiency,” IEEE CICC 2019
  3. Jinbo Li, Zhiwei Xu, Q. J. Gu, “A 21-dBm OP1dB 20.3%-Efficiency -131.8dBm/Hz-Noise X-band Cartesian Error Feedback Transmitter with Fully Integrated Power Amplifier in 65nm CMOS,” IEEE ISSCC2019
  4. J. Li, and Q. J. Gu, “Harmonic-Based Nonlinearity Factorization of Switching Behavior in Up-Conversion Mixers,” IEEE Transactions on Circuits and Systems I, March 2019
  5. M. N. Hasan, S. Saeedi, Q J Gu, H. H. Sigmarsson, and X. Liu “Design Methodology of N-Path Filters With Adjustable Frequency, Bandwidth, and Filter Shape” IEEE Transactions on Microwave Theory and Techniques, March 2018
  6. Jinbo Li and Q. J. Gu “A 10 GHz Up-conversion Mixer with 13.6 dBm OIP3 Using Regulator-based Constant Gm Stage and Harmonic Nulling,” 2018 IMS Student Paper Finalist
  7. J. Li, Z. Xu,W. Hong, and Q. J. Gu, “A Cartesian Error Feedback Architecture” IEEE IEEE Transactions on Circuits and Systems I, November 2017
  8. J. Li and Q. J. Gu, “A Low-Noise Cartesian Feedback Architecture,” 2017 IEEE International Symposium on Circuits and Systems ISCAS2017
  9. J. Li and Q. J. Gu, “A Systematic Coupling Balance Scheme to Enhance Amplitude and Phase Matches for Long Traveling N-Pair Differential Signals,” IEEE International Microwave Symposium IMS2017
  10. J. Li, R. Shu, and Q. J. Gu, “A Fully-Integrated Cartesian Feedback Loop Transmitter in 65nm CMOS,” IEEE International Microwave Symposium IMS2017 Advanced Practice Paper Finalist
  11. M. Naimul Hasan, Q. J. Gu, and X. Liu, “Tunable Blocker-Tolerant On-chip RF Front-end Filter with Dual Adaptive Transmission Zeros for Software Defined Radio Applications,” IEEE Transactions on Microwave Theory and Techniques, pp. 4419-4533, vol.64, no. 12, Dec. 2016
  12. M. Naimul Hasan, Q. J. Gu, and X. Liu, “Tunable Blocker-Tolerant RF Front-end Filter with Dual Adaptive Notches for Reconfigurable Receiver, “ IEEE International Microwave Symposium 2016
  13. J. Li, R. Shu and Q. J. Gu, “10GHz CMOS Hybrid Reflective Type Phase Shifter with Enhanced Phase Shifting Range,” IET Electronic Letters, vol. 51, no. 23, pp. 1935-1937, November 2015
  14. J. Li, R. Shu, and Q. J. Gu, “Passive Interferometer for Wideband and Linear Transmitter Leakage Cancellation,” 2015 IEEE Asian Pacific Microwave Conference APMC Best Student Paper Award
  15. Md. N. Hasan, Q. J. Gu, and X. Liu, “Reconfigurable Blocker-Tolerant RF Front-end Filter with Tunable Notch for Active Cancellation of Transmitter Leakage in FDD Receivers,” 2016 IEEE International Symposium on Circuits and Systems (ISCAS), Student Paper Finalist
  16. Z. Xu, D. Winklea, T. C. Oh, S. Kim, S. T.W. Chen, Y. Royter, M. Lau, I. Valles, D. A. Hitko, J. C. Li, Q. J. Gu, “0.8/2.4 GHz Programmable Active Band Pass Filters in InP/Si BiCMOS Technology,” IEEE Transactions on Microwave Theory and Techniques, vol. 63, no. 4, pp. 1219-1227, April 2015
  17. Q. J. Gu and Z. Gao, “A CMOS High Speed Multi-Modulus Divider with Retiming for Jitter Suppression,” IEEE Microwave and Wireless Components Letters, vol. 23, no.10, pp.554-556, October 2013

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