This is independent of Z o , as long as Z o is not perfectly resonant at this requency. Thus, for these values of frequency the network acts like a current transformer. 1615/4] Fig. 4 'Pi' circuit with arbitrary load impedance The circuit of Fig. 3 is not suitable as a current transformer. However, the 'pi' circuit of Fig. 4 acts as a current transformer at the frequency 1 L 2)C] (13) In summary, it has been shown that an arbitrary two-port network will operate as a voltage transformer at those frequencies for which g 22 = 0 and as a current transformer at those frequencies for which h 22 = 0. These results are independent of load provided that, at the frequencies of interest, Z o =£ 0 and Z o ^ oo, respectively.
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