Some Key Modules Design Of A 14-bit 200MHz Pipelined ADC

ADC (Analog-Digital Converter) is a bridge that lies between the analog world and the digital world, which is widely used in systems like communications, radar, medical, instrumentation, image processing, audio processing. High-performance ADC is the basis of modern digital signal processing systems. Pipelined ADC, which balances the speed and the accuracy, is a mainstream structure used for high-speed& high-resolution ADC design. In this paper, a 14bit 200MHz pipeline ADC is studied. The structure of the studied pipeline ADC is got by a survey of the noise and power model. Based on this structure, a SMIC 0.13um 1P8M mixed-signal process is used to design some key modules of the 14 bit 200MHz high-speed& high-resolution pipeline ADC. The main works include the following aspects:(1) A Gate-Voltage boostrapped switch is designed with a high degree of linearity. This switch minimizes the effect of the variation of the Vth.(2) A High-speed switch-capacitor comparator, which has very small kickback noise, is designed by the use of the kickback reduction technology.(3) A stable voltage reference is proposed. Inside the voltage reference, a bandgap reference with high PSRR (Power Supply Rejection Ratio) is carefully designed, using PSRR boost technology. Besides, a very high bandwidth buffer is proposed to meet the needs of the requirements of the voltage reference.In this paper, all of the modules mentioned above are carefully simulated under Cadence. Simulation results show that the performance of each module can match the requirements of a 14bit 200MHz pipeline ADC very well.