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In digital logic circuits, unconstrained scan tests are known to evoke much higher switching activity than functional modes. To create test conditions which are as similar as possible to functional modes, today's ATPG tools have knobs to constrain the switching activity of the generated test to a user-defined functional (= lower) level. Two-dimensional system chips (SoCs) and three-dimensional stacked...
With the development of semiconductor technology, semiconductor switching devices have the advantages of fast switching speed, high stability, so they are popular in pulsed power research field, but the use of semiconductor switch causes the main circuit be complex and the cost increase, and the switching speed is limited by the drift velocity of the charge carriers for the particular device. So it...
The Z-pinch driven X-ray source is the combinations of the pu lsed-power electrical energy source, transmission line, switch and the wire-array load. It has been proved by many experime nts that the X-ray source produced by Z pinches has wide appl ications on inertial confinement fusion, high energy density sci ence and experimental astrophysics. Full circuit model has bee n developed to simulate...
An electric brake for wind turbine systems is proposed in this paper. Effective emergency electrical braking is needed if an overvoltage occurs due to grid failure. The derived circuits use high power thyristors corresponding to the high values of generated power from today's wind turbines. A practical confirmation with BLDC a generator is ongoing in the laboratory. The principle of operation is proved...
A neuromorphic analog chip is presented that is capable of implementing massively parallel neural computations while retaining the programmability of digital systems. We show measurements from neurons with Hopf bifurcations and integrate and fire neurons, excitatory and inhibitory synapses, passive dendrite cables and central pattern generators implemented on the chip. This chip provides a platform...
The paper shows the switching behaviour of a grid circuit breaker in case of short circuits close to generator terminals. For the simulation a new three-phase circuit breaker model has been developed in the network calculation program Power-Factory. PowerFactory is an appropriate software to simulate the switching behaviour of a circuit breaker.
If energy requirements of electronic components decline reasonably, then ambient energy scavenging and conversion could become a viable source of power for many applications. Ambient energy sources can be then considered and used to replace batteries in some electronic applications, to minimize product maintenance and operating cost. Power scavenging may enable electronic devices to be completely...
Interest for harvesting energy from the environment to sustain the operational lifetime of any battery-driven electronic device like wireless sensor nodes has been growing tremendously. One prominent challenge with energy harvesting sources is the deficiency in energy supply to continuously power the electronic devices even with the rapid advancement in ultra low power microelectronic technology....
A novel scheme for reducing the test application time in accumulator-based test-pattern generation is presented. The proposed scheme exhibits extremely low demand for hardware. It is based on a decoder whose inputs are driven by a very slow external tester. Experimental results on ISCAS benchmarks substantiate a test-time reduction of 75%-95% when compared to previously published test-set embedding...
An on-chip buck converter with 3D chip stacking is proposed and the operation is experimentally verified. The manufactured converter achieves a maximum power efficiency of 62% for an output current of 70mA with a switching frequency of 200MHz and a 2x2mm on-chip LC output filter in 0.35mum CMOS. The use of glass epoxy interposer to increase the maximum power efficiency up to 71.3%, and the power efficiency...
This paper describes a design flow for the circuit-level optimization of a technology. The concurrent exploration of device characteristics and library design choices leads to a more application-optimal technology. We illustrate the design flow by: 1) analyzing the impact of buffer cell design, and 2) by optimizing a 130 nm technology for low operational power.
It is shown that the problem of deciding and constructing a perfect matching in bipartite graphs G with the polynomial permanents of their n × n adjacency matrices A (perm(A) = nO(1)) are in the deterministic classes NC2 and NC3, respectively. We further design an NC3 algorithm for the problem of constructing all perfect matchings (enumeration problem) in a graph G with a permanent bounded by O(nk)...
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