Purpose -The aim of this paper is to analyze the effects of aggressor-line load variations (both active gate and passive capacitive loads) on the nonideal effects of a coupled VLSI-interconnect system. Design/methodology/approach -Signal delay, power dissipation and crosstalk noise in interconnect can be influenced by variation in load of another interconnect which is coupled to it. For active gate and passive capacitive load variations, such effects are studied through SPICE simulations of a coupled interconnect pair in a 0.13 mm technology. Crosstalk between a coupled pair, is affected by transition time of the coupled signal, interconnect length, distance between interconnects, size of driver and receiver, pattern of input, direction of flow of signal and clock skew. In this work, influence of an aggressor-line load variations (both active gate and passive capacitive loads) on the non-ideal effects of delay, power consumption and crosstalk in a victim-line of a coupled VLSI-interconnect system are determined through SPICE simulation. In this experiment, the victim line is terminated by a fixed capacitive load and the coupled to aggressor line has variable load, either passive capacitive or active gate. Four different input signal cases have been considered for the two types of variable load. Distributed RLC transmission model of interconnect is considered for the SPICE simulations. Findings -The simulation results reveal that the effects are much dependent on the type of load and signal variations at the inputs of the two mutually coupled interconnects. Load control at the aggressor far end can be used to minimize some of the adverse effects of crosstalk. Originality/value -This paper shows that in interconnect, signal delay, power consumption and crosstalk are all affected by load variations in a coupled neighboring interconnect.
The present work attempts to enhance the sensitivity of a folded beam microelectromechanical systems (MEMS) capacitive accelerometer by optimising the device geometry. The accelerometer is intended to serve as a microphone in the fully implantable hearing application which can be surgically implanted in the middle ear bone structure. For the efficient design of the accelerometer as a fully implantable biomedical device, the design parameters such as size, weight and resonant frequency have been considered. The geometrical parameters are varied to obtain the optimum sensitivity considering the design constraints and the stability of the structure. The optimised design is simulated and verified using COMSOL MULTIPHYSICS 4.2. The stability of the device is ensured using eigenfrequency analysis. Optimised results of the device geometry are presented and discussed. The accelerometer has a sensing area of 1 mm2 and attains a nominal capacitance of 5.3 pF and an optimum sensitivity of 6.89 fF.
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