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Nan Qi

Biography

Enrollment Date: 2008

Graduation Date：2013

Degree：Ph.D.

Defense Date：2013.05.30

Advisors：Shaojun Wei

Department：Institute of Microelectronics，Tsinghua University

Title of Dissertation/Thesis：Multi-mode Reconfigurable Techiniques for GNSS Receiver

Abstract:
As the Beidou Global Satellite System accelerates its establishment, the GNSS come to a new developing era, which is characterized by high-precision navigation and multi-constellation positioning. Focused on multi-mode GNSS signals and their dual-channel reception, this dissertation has studied on the key techniques in the design of GNSS RF receivers. A dual-channel reception technique is proposed for the optimization of power consumption and chip-area occupation. Ay adopting a low-IF/zero-IF/dual-conversion architecture and the flexible frequency plan, the GNSS receiver achieves the dual-constellation reception with only one frequency synthesizer. At the same time, the sampling rate is limited to the same value than that in the single channel mode, which saves the hardware cost and DC power in the digital baseband. A top-down multi-mode reconfiguration technique is proposed. All kinds of GNSS signals can be received by configuring the frequency plan and the operation mode in each functional module. Furthermore, the key modules are realized in array, which makes it possible to regulate its power consumption in each mode. Based on the techniques above, this thesis designs the world’s first dual-channel GNSS radio supporting all the GNSS signals in 65nm CMOS. Measurement results show that the radio features 1.88dB NF and 50dB IRR, and realizes dual-constellation positioning when cooperated with a digital baseband chip. Employing single this chip rather than two MAX2769s can finish the cooperation, and the same carrier-to-noise ratio. Another two 180nm GNSS RF receivers are realized in this dissertation, both of which share the RF section in two channels. The two chips all feature a 2.6dB NF and more than 30dB IRR. One of them adopts the dual-conversion architecture, in order to lower the power consumption of the digital baseband. A technique to suppress out-of-band (OOB) blockers and in-band jammers is proposed in this thesis. By adopting the translational-impedance technique, the high-Q band-pass filtering is realized in RF. Furthermore, a CT-sigma-delta ADC with large dynamic range is employed to replace the function of power and chip size saving.Based on the technique above, a 65nm CMOS GNSS receiver with high-linearity is realized, which can tolerate -15dBm OOB blockers and in-band jammers that 20dB stronger than the thermal noise floor.

Publications

Papers：：

[1] Yunqi Yang, Ming Zhong, Qianli Ma, Ziyi Lin, Leliang Li, Guike Li, Liyuan Liu, Jian Liu, Nanjian Wu, Haikun Jia, Xinghui Liu, Nan Qi, A 56Gb/s De-serializer with PAM-4 CDR for Chiplet Optical-I/O, ICTA 2022, pp.202-203, 2022.

[2] Jianfu Lin,Zheng Song,Nan Qi,Woogeun Rhee,Zhihua Wang,Baoyong Chi, A 77-GHz Mixed-Mode FMCW Signal Generator Based on Bang-Bang Phase Detector, IEEE Journal of Solid-State Circuits, Vol.53, No.10, pp. 2850 - 2863, 2018.

[3] Yang Xu,Zehong Zhang,Baoyong Chi,Nan Qi,Hualin Cai,Zhihua Wang, A 5-/20-MHz BW Reconfigurable Quadrature Bandpass CT ΔΣ ADC With AntiPole-Splitting Opamp and Digital I/Q Calibration, IEEE Transactions on Very Large Scale Integration (VLSI) Systems, Vol.24, No.1, pp. 243 - 255, 2016.

[4] Zheng Song,Nan Qi,Baoyong Chi,Zhihua Wang, A multi-mode reconfigurable analog baseband with I/Q calibration for GNSS receivers, ASP-DAC 2014, pp. 29 - 30, 2014.

[5] Lingwei Zhang,Baoyong Chi,Nan Qi,Liyuan Liu,Hanjun Jiang,Zhihua Wang, A Lower Power Reconfigurable Multi-Band Transceiver for Short-Range Communication, Journal of Semiconductors, Vol.34, No.3, pp. 035008-1-7 , 2013.

[6] Nan Qi,Fan Chen,Lingwei Zhang,Xiaoman Wang,Baoyong Chi, A Reconfigurable Multi-Mode Multi-band Transmitter with Integrated Frequency Synthesizer for Short-Range Wireless Communication, Journal of Semiconductors, Vol.34, No.9, pp. 095008-1-7, 2013.

[7] Nan Qi,Baoyong Chi,Yang Xu,Zhihua Wang, A radio-frequency amplifier with tunable high-Q RF bandpass filtering for SAW-less wireless receivers, Electronics Letters, Vol.49, No.10, pp. 656 - 657, 2013.

[8] Nan Qi,Zheng Song,Baoyong Chi,Tianling Ren,Albert Wang,Zhihua Wang, A Multi-Mode Complex Bandpass Filter With gm-Assisted Power Optimization and I/Q Calibration, ISCAS 2013, pp. 1845 - 1848, 2013.

[9] Nan Qi,Baoyong Chi,Yang Xu,Zhou Chen,Jun Xie,Zheng Song,Zhihua Wang, A 180nm fully-integrated dual-channel reconfigurable receiver for GNSS interoperations, ESSCIRC 2013, pp. 177 - 180, 2013.

[10] Nan Qi,Baoyong Chi,Yang Xu,Zhou Chen,Jun Xie,Yang Xu,Zheng Song,Zhihua Wang, An asymmetric dual-channel reconfigurable receiver for GNSS in 180nm CMOS, CICC 2013, pp. 1 - 4, 2013.

[11] Nan Qi,Zheng Song,Zehong Zhang,Yang Xu,Baoyong Chi,Zhihua Wang, A Multi-Mode Blocker-Tolerant GNSS Receiver with CT Sigma-Delta ADC in 65 nm CMOS, A-SSCC 2013, pp. 333 - 336, 2013.

[12] Zehong Zhang,Yang Xu,Nan Qi,Baoyong Chi, A 5/20MHz-BW 4.2/8.1mW CT QBP ΣΔ Modulator with Digital I/Q Calibration for GNSS Receivers, A-SSCC 2013, pp. 393 - 396, 2013.

[13] Yang Xu,Baoyong Chi,Yang Xu,Nan Qi,Zhihua Wang, A 2-mW 50-dB DR wideband hybrid AGC for a GNSS receiver in 65 nm CMOS, Chinese Journal of Semiconductors, Vol.33, No.7, pp. 075006 - 1 - 8, 2012.

[14] Yang Xu,Baoyong Chi,Xiaobao Yu,Nan Qi,Partick Chiang,Zhihua Wang, Power-Scalable, Complex Bandpass/Low-Pass Filter With I/Q Imbalance Calibration for a Multimode GNSS Receiver, IEEE Transactions on Circuits and Systems II-Express Briefs, Vol.59, No.1, pp. 30 - 34, 2012.

[15] Nan Qi,Yang Xu,Baoyong Chi,Yang Xu,Xiaobao Yu,Xing Zhang,Ni Xu,Patrick Chiang,Woogeun Rhee, Zhihua Wang, A Dual-Channel Compass/GPS/GLONASS/Galileo Reconfigurable GNSS Receiver in 65 nm CMOS With On-Chip I/Q Calibration, IEEE Transactions on Circuits and Systems -I: Regular papers, Vol.59, No.8, pp. 1720 - 1732, 2012.

[16] Yang Xu,Nan Qi,Zhou Chen,Baoyong Chi,Zhihua Wang, A hybrid approach to I/Q imbalance self-calibration in reconfigurable low-IF receivers, ISCAS 2012, pp. 552 - 555, 2012.

[17] Zhou Chen,Yang Xu,Nan Qi, A Power-Scalable Reconfigurable Active-RC Complex Band-pass Filter for a Multimode GNSS Receiver, ICSICT 2012, pp. 1 - 3, 2012.

[18] Nan Qi,Yang Xu,Baoyong Chi,Yang Xu,Xiaobao Yu,Xing Zhang,Zhihua Wang, A Dual-Channel GPS/Compass/Galileo/Glonass Reconfigurable GNSS Receiver in 65nm CMOS, CICC 2011, pp. 1 - 4, 2011.

[19] Xinkai Chen,Xiaoyu Zhang,Lingwei Zhang,Xiaowen Li,Nan Qi,Hanjun Jiang,Zhihua Wang, A Wireless Capsule Endoscope System with Low-Power Controlling and Processing ASIC, IEEE Transactions on Biomedical Circuits and Systems, Vol.3, No.1, pp. 11 - 22, 2009.

[20] Yingke Gu,Xiang Xie,Ziqiang Wang,Guolin Li,Tianjia Sun,Nan Qi,Chun Zhang,Zhihua Wang, A New Globularity Capsule Endoscopy System with Multi-Camera, BioCAS 2009, pp. 289 - 292, 2009.

[21] Nan Qi,Guolin Li, Phase noise optimizing in the design of quadrature-output voltage controlled oscillators, Application Of Electronic Technique, Vol.34, No.8, pp. 65 - 68, 2008.

[22] Xinkai Chen,Xiaoyu Zhang,Lingwei Zhang,Nan Qi,Hanjun Jiang,Zhihua Wang, A Wireless Capsule Endoscopic System with a Low-Power Controlling and Processing ASIC, A-SSCC 2008, pp. 321 - 324, 2008.