Design, simulation and measurement techniques for embedded decoupling capacitors in multi-GHz packages/PCBs
Embedded capacitor is a better solution than surface mount capacitors for decoupling in a high speed, high performance packages/PCBs. Our study has showed that with conventional approaches, the embedded capacitor for decoupling in power delivering network can work from 100 MHz to 1 GHz systems. Pushing the operating frequency over 1 GHz is a challenge for system designers. This paper discusses the embedded decoupling capacitor design for multi-GHz systems through principles, simulation, measurement error, and error elimination.
Through co-design to optimize power delivery distribution system using embedded discrete de-coupling capacitor
As clock speeds increase into the gigahertz regime and rise times decrease into the pico-second regime, the interaction between capacitors and power/ground planes of a package, or board on which they are mounted becomes vitally important to the performance of a power delivery system. Capacitors pose the biggest challenge for integration in packages due to the large capacitance required for decoupling high performance circuits. Although Embedded Passive Substrate (EPS) using thin-film technique was addressed and developed, the actually application without substrate packaging layer increased is difficult. An Embedded Discrete Passive Substrate (EDPS) technology is increasingly drawing attention because of its potentials in addressing system cost reduction by offering smaller size form factor with high level of integration in packaging. In this paper, a embedded discrete capacitor structure was designed and fabricated on organic substrate packaging. Through early engagement and optimization on substrate packaging design, the embedded discrete capacitors could improve the electrical performance of core power distribution system. To validate the feasibility, a test substrate packaging is built. In addition, the simulation results of core power distribution system with EPDS and Copper Wire-Bond (CWB) on time-doamain and frequency-domain demonstrate the electrical performance is better than others.
Research on Control and Planning of Soft-Wing UAV for Haze Removal
The existence of fog and haze has caused great pollution to the environment. The research of removing haze is a hot topic in recent years. In this paper, a special haze removal algorithm based on Soft- Wing UAVis proposed. In this algorithm, two track control strategies are designed based on the Soft-Wing UAV model transfer function. A SIMULINK platform based mathematical model of Soft-Wing UAV is built to testified effectiveness of the two track control strategies. An autonomous ergodic-planning algorithm with greedy strategy and foldback algorithm for Soft-Wing UAV is designed. Within the algorithm, the haze regional has been modelled, the cost matrix is constructed, and the planning and ergodic strategy is proposed. Finally, the experimental results validates the reliability of the algorithm in the application of haze removal with the proposed evaluation Index.