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Articles by Dongdong Liu
Total Records ( 2 ) for Dongdong Liu
  Wei Chen , Xiuqin Xu , Hui Xu , Ming Hong , Zhiyu Wang , Yongheng Shang , Dongdong Liu , Min Zhou , Zhengliang Huang and Faxin Yu
  This study presents the temporal Coupled-Mode Theory (CMT) analysis of a K-band MMIC (Microwave Monolithic Integrated Circuit) bandpass filter with dual orthogonal resonant modes. Two test methods are applied and compared in the filter response measurement. The dimensions of the MMIC filter, whose chip size is 1.9×1.35 mm, are optimized based on the FEM (Finite Element Method) simulation assisted temporal coupled-mode theory. As a two-port reciprocal system, the transmission and reflection responses of the filter are deduced. GaAs MMIC IPD (Integrated Passive Device) technology is applied for chip fabrication. The test results using a probe station fit well with the simulation results. A testing fixture is introduced to model the practical application scenario, whose measurement results, after de-embedment, have shown consistency with the simulation and the probe station test results.
  Mengyao Su , Jiarui Liu , Hua Chen , Dongdong Liu , Min Zhou , Zhiyu Wang , Yongheng Shang , Zhengliang Huang and Faxin Yu
  This study presents a design of a highly reliable shift register based on TSMC 0.18 μm process which can efficiently fight against the Single Event Upset (SEU). A bilateral Power on Reset (POR) block, together with bit-line segregation and tri-mode redundancy technologies are applied in this design to comprehensively enhance the SEU hardening performance at both system level and circuit level. Assisted by the theory of transient circuit analysis, the shift register’s SEU hardening performance is achieved from the aspects of both schematic and layout. A current pulse which is used to emulate the SEU effect, is injected in the circuit for verification. The result of simulation shows great improvement of the SEU tolerance. With its high reliability and radiation tolerance, the present shift register can be applied to CMOS chip designs in the field of aerospace.
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