Delta-sigma (∆Σ) converters have been widely used in wireless communications as they provide the most economic speed-accuracy tradeoff. This paper presents the system-level design of a multi-bit continuous-time (CT) ∆Σ analog-to-digital converter (ADC) targeting for the next generation wireless application. The modulator topology is determined based on the application requirements using MATLAB software. The nonidealities associated with the multi-bit CT ∆Σ modulator, such as excess loop delay, system clock jitter, integrator nonideality and multi-bit digital-toanalog converter (DAC) element mismatch, are also modeled in the system-level. With all the nonidealities included, the designed modulator achieves a dynamic range (DR) of 74dB (12 bits) in a 50-MHz signal bandwidth.Index Terms -Analog-to-digital converter (ADC), continuous-time (CT), delta-sigma (∆Σ) modulation, multibit, system-level.
Printed Circuit Board (PCB) is not only an important electrical module of information equipment, but also an important source of electromagnetic radiation. Only when PCB works normally and is compatible with other electrical equipment, the whole information equipment can work normally. Because of the complexity of PCB structure and the difficulty of modeling, the EMC (Electromagnetic Compatibility) analysis of PCB is very difficult. For this reason, Taking the widely used full bridge current double rectifier converter as an example, aiming at the electromagnetic compatibility problems caused by the PCB design of the switching power supply, this paper proposes a simulation method based on the electromagnetic field by establishing the near-field radiation model of the PCB, analyzes the areas with high radiation intensity in the PCB layout, by optimizing the layout and wiring of the PCB, the electromagnetic compatibility performance of the switching power supply is improved. The simulation results show that the near-field radiation characteristics of PCB can be predicted by introducing the electromagnetic field simulation method in the design stage, according to the characteristics of the magnetic field, the optimal design is realized, so that the EMC of the switching power supply reaches the standard, and finally the working performance of the switching power supply is improved.
This project would not have been possible without the collaboration and support from many individuals. Most importantly, I would like to express my appreciation to my supervisor, Prof. Siek Liter, for his indefatigable encouragement, inspiring and edificatory supervision and guidance throughout the whole research process. I would like to extend my gratitude to Prof. Tiew Kei Tee, for generously sharing his precious knowledge and expertise in the field of analog-to-digital data convertor design. Special thank goes to GLOBALFOUNDRIES (formally known as Chartered Semiconductor Manufacturing), without whose technical and financial support, the completeness of this project will be impossible. I would also be very grateful to my friends, Leow Yoon Hwee, Teh Li Lian, Zhang Fan, He Jin and Trans Xuan Ann in CICS. They have shared their fun and experience with me from time to time. I would also like to thank them for their technical discussions. Finally, I would also like to give my sincere appreciation to the technical staffs in CICS lab for all their helping hands giving to me.
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