AN ANALYTIC METHOD FOR TWO-PORT PASSIVE NETWORK COMPUTING FOR ANALYSIS OF COUPLED OSCILLATORS

Autor/autori: Mihai IORDACHE, Lucia DUMITRIU, Lucian MANDACHE, Dragos Niculae, Jean-Marie PAILLOT (Franta), David CORDEAU (Franta)

Abstract: Voltage controlled oscillators are present in the most of the digital communication system. In our days, they are used to control the phase in microwave antenna arrays. Researches are made so that a particular phase shift can be obtained by choosing the free-running frequencies of the oscillators in the array. In this paper, we have analyzed, in different ways, in time and also in frequency domain, the phase shift between output voltages of each oscillator. Because the coupling circuit is a two-port passive complex network, a new software which can generate in full-symbolic or numericsymbolic form the Y, Z, H, and fundamental parameters of a two-port structure was implemented. Our procedure can also determine all the resonant frequencies of any two-port configuration as functions of the two-port circuit parameters. The procedure is based on the modified nodal equations in full-symbolic form and/or on the state equations in full-symbolic normal form, in the frequency domain. For this procedure a new program called ANCSYANP (Analog Circuit Symbolic Analysis Program) was elaborated. Some illustrative examples are done

Keywords: symbolic analysis, phase shift, synchronization frequency, Van der Poll oscillator, Y parameters, time analysis, frequency analysis

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