The Design Of 12b 100MSPS High Speed DAC

With the development of the computer, the multimedia, the signal processing and the microelectronic, the advanced electronic system comes forth continuously. The Digital-Analog Converter will be used in the front end and back end of the advanced electronic system and it needs the higher speed and resolution. This paper designs a 12b 100MSPS sectional coding current steering DAC.This paper present a general introduction on D/A converter of basic structure and principle, study of domestic and aboard, the analysis of different converting type such as current converting, voltage converting and charge converting, and the analysis of static parameter and dynamic parameter of D/A converter. Based on the study of binary code D/A converter and thermometer code D/A converter, and the performance parameter of D/A converter, a 6+6, low 6b to be binary code and high 6b to be thermometer code, current steering D/A converter has been designed. Some of the basic design theory and technology are presented within this paper. To improve this D/A converter, some of the cell architectures, including register, thermometer decoding, gate circuit, latch, clock, reference voltage and current, current source array, switch array, have to be designded carefully. The details of these cells are described in this paper. Through the analysis of principle and the design of structure of each module, and the simulating, debugging and drawing of layout of D/A converter, it has completed the whole design of the D/A converter.This architecture implements the 12 bit D/A converter and achieve a speed of 100MSPS, 50M input frequency, switching speed 2.82ns, DNL less than 0.6LSB, INL less than 1.8LSB. SFDR 71.0dB, THD -82.0dB, SNR 70.1dB, SNDR 70.1dB, the maximum power dissipation 188.1mW, and area is less than 3.78mm~2.