In recent years, wireless communication has been a hot area of the research and design of integrated circuits, which is widely used for its high flexibility and high mobility. And the wireless RF transmitters that used in personnel positioning, active tag identification, parking management, e-health and other areas are the focus of attention. DAC(Digital to Analog Converter, abbreviated as DAC) is an indispensable part of a wireless RF transmitter, that converts digital signals into analog signals.The task of the thesis is to study and design a DAC that used in a 2.4GHz wireless transmitter. The DAC must have the properties of low power consumption, high-performance and low-cost to meet the requirements of the project. Firstly a general introduction on DAC study of domestic and aboard is presented. The basic principles and structures of DAC are introduced, and some basic design ideas and methods of the DAC are discussed. With the detailed analysis and the comparison of the advantages and disadvantages of several typical structures of DAC, a 6-bit DAC is selected to meet the requirements of the project.According to modular design approach, internal key sub-circuits of the 6-bit DAC are designed, including reference voltage source, weighting network, binary switch, LPF (low pass filter, abbreviated as LPF) and operational amplifier. All the blocks of the DAC are simulated, and the simulation results show that all the blocks work well.Finally, the DAC circuit comprised of the blocks designed above is analyzed and simulated. The layout of the DAC is designed, and the layout design passes the DRC(Layout Rule Check, abbreviated as DRC)and LVS(Layout Versus Schematic, abbreviated as LVS) verification. The chip is taped out and tested, and the test results show that the DAC works properly. |