Biography
Enrollment Date: 2012
Graduation Date：2015
Degree：M.S.
Defense Date：2015.06.04
Advisors：Woogeun Rhee
Department：Institute of Microelectronics，Tsinghua University
Title of Dissertation/Thesis：
Abstract:
Recently, with the development of public healthcare system, patients expect better healthcare service, which leads to higher requirements from all the medical devices. As a result, professional medical devices tend to be in increasing shortage as a public resource. Luckily, the miniaturization, intellectualization, portablization of professional healthcare devices would greatly help to turn those equipments previously operated only in hospitals into home use, which is widely agreed by both doctors and patients as a promising method of relieving the pressures from the public medical devices shortage.
Under such a background, the researches of ultra-low power wireless communication techniques applied in medical electronics fields show great significance on the base of real civil demands, and become a topical issue in both academic and industrial study. As one significant module between medical data sensing and data processing, ultra-low power modulation techniques play an important role in the real solution of medical communication devices, because modulation quality would affect wireless communication properties to a great degree.
The purpose of this research is to propose one ultra-low power modulator design with high modulation energy efficiency, good modulation quality and high data rate, as a feasible solution in ultra-low power medical electronics application. In this work, A 0.65V 2.4GHz/400MHz digital-intensive phase modulator is implemented in 65nm CMOS. In ultra-low voltage design, the two-point modulator suffers a lot from the DCO nonlinearity. A 2.4GHz semi-digital fractional-N PLL with an FIR filter embedded 1-bit high-pass modulation is employed to overcome the nonlinearity problem in the conventional two-point modulator. The 400MHz modulator performs an FIR-embedded OQPSK modulation to reduce the spectral regrowth in sidelobe. For compact area and low voltage design, an inverter based phase interpolator with a harmonic filtering technique is designed after generating multiphase signals directly from the 2.4GHz output. The 1Mb/s GFSK 2.4GHz and the 10Mb/s OQPSK 400MHz modulators consume 0.94mW and 1.2mW, achieve the EVM values of 5.7% and 6.4% respectively.