Browsing by Author "Ionescu, Ciprian"

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    Analysis of ceramic chip capacitors at high frequency
    (Видавництво Національного університету "Львівська політехніка", 2002) Golumbeanu, Virgil; Svasta, Paul; Ionescu, Ciprian; University Politehnica Bucharest, Romania
    The dimensions of monolithic ceramic capacitors today becomes very small and they presents good performance at high frequency. It is used in various high frequency circuits for impedance matching, DC block, filter, bypass and decoupling functions. For the best performance in these applications , low equivalent series resistance and equivalent series inductance is required. This parameters are analyzed in the paper for multilayer ceramic chip capacitors. Using an impedance analyzer and SPICE simulations the impedance of capacitors at high frequency is presented.
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    The reflections produced by lumped load of digital signal line
    (Видавництво Національного університету "Львівська політехніка", 2002) Golumbeanu, Virgil; Svasta, Paul; Ionescu, Ciprian; University Politehnica Bucharest
    In interconnection technique of digital circuits in general the matched lines method for reducing the influence of reflections in a view to a good working of interconnected circuits is used. Due to the input capacitance of digital circuits appears a reactance load. Although the matching is very good realized from the viewpoint of the resistive load, there is a reactive mismatching that can produce reflections at high frequency. Using Laplace transformation the reflections produced by parasitic capacitance load will be determined. These reflections will be analyzed depending on the type of the digital circuits and the parameters of the interconnection line. For some types of digital circuits the maximum fanout from this point of view will be determined.