Biography

Enrollment Date: 2007

Graduation Date：2010

Degree：M.S.

Defense Date：2010.06.10

Advisors：Woogeun Rhee

Department：Institute of Microelectronics，Tsinghua University

Title of Dissertation/Thesis：Design of Two Point Modulated Frequency Synthesizer for GFSK Modulation

Abstract:
The Two-point modulator is a novel direct frequency modulation technology based on the ΔΣ fractional N frequency synthesizer. It can be used in the modulation of constant envelope signals such as GFSK signal, and it can also be used in the modulation of non-constant envelope signals by extended to be the polar transmitter. Owing to its advantages of structure simplicity, low power consumption and feasibility of integration, it very well satisfies the requirement of transmitters posed by fast developing communication technology, and is widely used in various communication protocols. The main research items in this thesis are as follows: Firstly, the working principle of the two-point modulator is studied. Especially the bottle neck of designing the two-point modulator, which is the gain and delay mismatch between the two signal paths, is analyzed. Secondly, a two-point modulation system is designed. It includes a chip of ΔΣ fractional N frequency synthesizer and peripheral circuits. Simulation results show that the rms EVM value of this two-point modulator achieves 5.4%. Thirdly, an algorithm of generating GFSK baseband signal is realized by FPGA. It is based on a look-up-table method developed from the principle of GFSK modulation.

Publications

Papers：：

[1] Bo Zhou,Jian Qiao,Rui He,Jinghui Liu,Wei Zhang,Hang Lv,Woogeun Rhee,Yongming Li,Zhihua Wang, A Gated FM-UWB System With Data-Driven Front-End Power Control, IEEE Transactions on Circuits and Systems I-Regular Papers, Vol.59, No.6, pp. 1348 - 1358, 2012.

[2] Yuanfeng Sun,Jian Qiao,Xueyi Yu,Woogeun Rhee,Byeong-Ha Park,Zhihua Wang, A continuously tunable hybrid LC-VCO PLL with mixed-mode dual-path control and bi-level delta-sigma modulated coarse tuning, IEEE Transactions on Circuits and Systems I-Regular Papers, Vol.58, No.9, pp. 2149 - 2158, 2011.

[3] Bo Zhou,Jian Qiao,Woogeun Rhee,Zhihua Wang, Relaxation Oscillator with Quadrature Triangular Waveform Generation, Electronic Letters, pp. 1 - 4, 2010.

[4] Xueyi Yu,Jian Qiao,Woogeun Rhee,Joon-Young Park,Kyongsu Lee,Zhihua Wang, A Semi-Digital Cascaded CDR With Fast Phase Acquisition and Adaptive Resolution Control, VLSI-DAT 2010, pp. 307 - 310, 2010.

[5] Bo Zhou,Rui He,Jian Qiao,Jinghui Liu,Woogeun Rhee,Zhihua Wang, A Low Data Rate FM-UWB Transmitter with Δ−Σ Based Sub-Carrier Modulation and Quasi-Continuous Frequency-Locked Loop, A-SSCC 2010, pp. 1 - 4, 2010.

[6] Yuanfeng Sun,Jian Qiao,Jun Li,Rui He,Chengwen Liu,Woogeun Rhee,Sung Hun Woo,Zhihua Wang, A Low-Cost, Multi-Standard ΔΣ Fractional-N Synthesizer Design for WiMAX/WLAN Applications, ISOCC 2009, pp. 100 - 103, 2009.

[7] Jian Chen,Xueyu Yu,Li Yugen,Zhihua Wang, Customized Zero Frequency Control for Hybrid FIR Noise Filtering in ΔΣ Fractional-N PLL, ISCAS 2009, pp. 2401 - 2404, 2009.