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.
Improvement of power integrity with novel segmented power bus structures in RF/digital SOP
With the voltage decreasing in power distribution network (PDN) in system-on-packages (SOPs), power integrity will be a critical issue. The cavity resonance modes between power and ground planes can be excited by simultaneous switching noise (SSN) or ground bounce noise (GBN) [1], [2]. To cut down the noise from susceptible devices, isolation techniques are necessary. In this paper, two novel structures combine segmented method and embedded capacitor provided isolation performances from 0.7 GHz to 10 GHz below -40 dB. The novel structures with a bridge for suppressing noise in high frequency and a thin high K dielectric substrate for decreasing the SSN in the entire frequency band. And they were better in performance and simpler in configuration than Electromagnetic Band Gap (EBG) and other isolation structures. Moreover, the analytical process could be a guidance to find better structures for improving the noise isolation.
Fault Diagnosis and CAN Bus/Ethernet Redundancy Design of a Monitoring and Control System
The ship monitoring system is used to monitor and control the working status of various equipment on the ship. The navigational safety of the ship is affected directly by the stable working of the monitoring system. In this paper, a ship monitoring system with fault-type judgment function and bus redundancy is designed to improve system reliability and reduce fault checking cost. A redundant Ethernet/CAN bus communication network is constructed in the system, which connects multiple simulation nodes. The simulation node can simulate the faults that may occur during the communication process and feeds back the fault information to the host computer. The host computer will analyze and display the corresponding fault type on the user interface with the feedback information is received. The system reconfigures the network route autonomously when the simulation node has a communication fault. Routing of fault nodes can be switched to redundant routing, and the load balancing of the communication network can be maintained. Through experimental tests, the system can accurately locate faults and achieve fast switching of redundant routes between buses. Hence, the reliability of data transmission is improved.