1994/3

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    New Version of the COCO Program
    (Společnost pro radioelektronické inženýrství, 1994-09) Cajka, J.; Fencl, F.
    The new version of the COCO program enables the analysis of linear circuits in symbolical, symbolic numerical or in semi-symbolical form. Simple synthesis problems can also be solved with the aid of this program. Several examples illustrate the use of the program for circuit analysis and synthesis. Modern network elements (trans-impedance operational amplifier, current conveyors) are built in the program.
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    DC Analysis of an Ideal Diode Network Using Its Decomposed Piecevise-Linear Model
    (Společnost pro radioelektronické inženýrství, 1994-09) Brzobohaty, J.; Pospisil, J.; Kolka, Zdeněk
    A new method of finding the operating points in circuits containing ideal diodes which utilizes the decomposed form of the state model of an one-dimensional piecewise-linear (PWL) system is developed. The universal procedure shown gives all the existing solutions quite automatically.
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    Digitally Controlled Linear Four-Port Network
    (Společnost pro radioelektronické inženýrství, 1994-09) Kolka, Zdeněk; Michalek, V.
    The paper deals with the design of a universal linear multipart. The circuit is based on digitally controlled multiple voltage-controlled voltage sources (MVCVSs). The main advantages of this control are accuracy, invariability, and very small area requirements. The whole system is simply connected to a PC via its parallel port. This multipart can generally be used as a building block for any model of a nonlinear dynamic system, namely for the piecewise-linear (PWL) model in both explicit and implicit forms.
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    Function Generator of Programmable Waveforms with Very Long Period Controlled by the Input Signal
    (Společnost pro radioelektronické inženýrství, 1994-09) Krejci, L.
    The paper deals with design of slow generator of periodic waveforms the shape of which can be changed. The generator with the period adjustable by control signal could provide wide application.
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    Atmospheric Optical Communications
    (Společnost pro radioelektronické inženýrství, 1994-09) Wilfert, O.
    This article contains a description of a digital atmospheric optical link (DAOL). DAOL may find LAN applications as bridger between buildings containing cable subnetworks or as temporary quick-connects for which cable runs are initially unavailable.