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Yang Xu

Biography

Enrollment Date: 2009

Graduation Date：2012

Degree：M.S.

Defense Date：2012.05.28

Advisors：Baoyong Chi

Department：Institute of Microelectronics，Tsinghua University

Title of Dissertation/Thesis：Research on RF Front-End for a Dual-Channel Multi-Mode GNSS Receiver

Abstract:
It is known that satellite navigation system was originally invented for defense purposes. Recently, the commercial explosion of navigation technology in civil market has brought this technology to a point where a broad range of applications are on the horizon. Meanwhile, besides the US, many other countries are developing their own satellite navigation systems, which could provide a possibility to further improve the quality of location-based services. Therefore, the research on Global Navigation Satellite Systems (GNSS) becomes a hot topic in the world.This thesis is focused on the implementation of CMOS dual-channel multi-mode GNSS receivers, in particular, on the research of key circuit building blocks such as radio-frequency amplifier (RFA), mixer, filter and a hybrid IQ calibration. Finally, implementation of a GNSS receiver chip and testing results are given out.During the design, noise figure simulation and calculation method were developed to guide the system design. A low power opamp with current-reuse and “anti-pole-splitting” technique was proposed to reduce the power of the filter. Also, a hybrid IQ calibration method was proposed.Polaris_1p0 is a dual-channel multi-mode reconfigurable GNSS receiver implemented in TSMC 65nm CMOS. Test results show that it could operate at 1.2GHz or 1.6GHz bands, with reconfigurable bandwidths among 2.2MHz, 4.2MHz, 8MHz, 10MHz, and 18MHz. The receiver achieves a minimum 1.88dB noise figure, an average 50dB image rejection ratio, with a total power of 31-44mW.

Publications

Papers：：

[1] Yang Xu,Xinwang Zhang,Zhihua Wang,Baoyong Chi, A Flexible Continuous-Time ΔΣ ADC With Programmable Bandwidth Supporting Low-Pass and Complex Bandpass Architectures, IEEE Transactions on Very Large Scale Integration (VLSI) Systems, Vol.25, No.3, pp. 872 - 880, 2017.

[2] Junfeng Zhang,Yang Xu,Zehong Zhang,Yichuang Sun,Zhihua Wang,Baoyong Chi, A 10-b Fourth-Order Quadrature Bandpass Continuous-Time ΣΔ Modulator With 33-MHz Bandwidth for a Dual-Channel GNSS Receiver, IEEE Transactions on Microwave Theory and Techniques, Vol.65, No.4, pp. 1303 - 1314, 2017.

[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] Junfeng Zhang,Zehong Zhang,Yang Xu,Baoyong Chi, A 54.4-mW 4th-order Quadrature Bandpass CT ΣΔ Modulator with 33-MHz BW and 10-bit ENOB for a GNSS receiver, RFIC 2015, 2015.

[5] Guodong Zhu,Junfeng Zhang,Yang Xu,Zehong Zhang,Baoyong Chi, A 1/2/4MHz multi-mode reconfigurable lowpass/complex bandpass CT ΣΔ modulator for short range wireless receiver, ASICON 2015, pp. 1 - 4, 2015.

[6] Qiongbing Liu,Yu Xiaobao,Junfeng Zhang,Yang Xu,Baoyong Chi, A reconfigurable CBP/LP active RC filter with noise-shaping technique for wireless receivers, Journal of Semiconductors, Vol.35, No.9, pp. 095003-6, 2014.

[7] Yang Xu,Zehong Zhang,Baoyong Chi,Qiongbing Liu,Xinwang Zhang,Zhihua Wang, Dual-mode 10MHz BW 4.8/6.3mW reconfigurable lowpass/complex bandpass CT ΣΔ modulator with 65.8/74.2dB DR for a zero/low-IF SDR receiver, RFIC 2014, pp. 313 – 316, 2014.

[8] Xinwang Zhang,Yang Xu,Bingqiao Liu,Qian Yu,Siyang Han,Qiongbing Liu,Zehong Zhang,Yanqiang Gao,Zhihua Wang, Baoyong Chi, A 0.1-5GHz flexible SDR receiver in 65nm CMOS, A-SSCC 2014, pp. 249 - 252, 2014.

[9] 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.

[10] Yang Xu,Baoyong Chi,Zhihua Wang, Gate-leakage compensation scheme for programmable SI-DAC of ΣΔ modulator in deep sub-micron, Analog Integrated Circuits and Signal Processing, Vol.76, No.1, pp. 155 - 160, 2013.

[11] 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.

[12] 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.

[13] 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.

[14] 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.

[15] 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.

[16] 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.

[17] 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.

[18] 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.

[19] Yang Xu,Baoyong Chi,Zhihua Wang, Power-scalable multi-mode reconfigurable continuous-time lowpass/quadrature bandpass sigma-delta modulator for zero/low-IF receivers, ISCAS 2012, pp. 293 - 296, 2012.

[20] 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.

[21] 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.

[22] Yang Xu,Baoyong Chi,Zhihua Wang, A Low Power Self-Sampling IF FSK Receiver, ASICON 2009, pp. 1113 - 1116, 2009.