Design And Implementation Of Multi-Phase And Radiation-Hardened In Phase-locked Loops

Phase-Locked Loop(PLL) has been widely used in the design of integrated circuits. Due to its accurate multiple phase clock outputs, Multiphase Phase-Locked Loop(MPLL) occupies a crucial place in the design of the Clock Data Recovery Circuit and high speed serial interface circuit. The rapid development of spaceflight and aviation had compelled that the electronic system can also work stably under the condition of irradiation, which has placed more demands on the ability of anti-radiation of the electronics used in space equipments. The MPLL must be hardened, but the radiation hardening design will contradict with the jitter of the MPLL.According to the problems mentioned above, a 130 nm COMS PLL with multiple phase clock outputs was implemented in this paper. The influence of loop parameters of the MPLL on multiple phase radiation-hardened performance was analyzed. The implementation of the MPLL and the radiation hardening technologies for it were studied. Finally, the function of the radiation-hardened MPLL was validated and the optimization strategy of low jitter was proposed. The main work can be summed up as following:(1)System level analysis, behavior modeling and SET effects analysis of the MPLL were made.In order to meet the stability requirements of the MPLL, mathematical models were made from the system level, and the loop parameters of the MPLL were determined preliminarily. For the low-jitter design, MPLL's noise was analyzed by modeling, and from the angle of low noise. The behavior level model was made in this paper to analyze the SET response of the MPLL. Moreover, based on the simulink model, the influence of the loop parameters on the SET response of the MPLL were studied, and loop parameters were optimized again.(2)Circuit design and radiation-hardened design of the MPLL were realized.To enhance the anti-radiation ability of the charge pump in the MPLL and its inhibition of non-ideal factors, a new improved charge pump was introduced on the basis of the traditional charge pump. In order to realize the low jitter and radiation-hardening, multiple phase clock outputs were realized based on the difference ring oscillators with branch feedback structure and symmetric load structure. The function and performance of the two kinds of structure was analyzed and compared, and the radiation-hardened design for the bias circuit and delay unit of the MPLL was made. For reinforcement, the divider circuits adopted triple modular redundancy structure.(3)Layout design of the MPLL was made and its function was validated.In this paper, the layout of the MPLL was implemented from the point of low jitter, and its resistance to SEL effect was analyzed. Finally, layout simulation verification of the MPLL unhardened and hardened was made. The results showed that the radiation-hardened MPLL could satisfy the requirement of the engineering.