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===Two port network transfer function===
Transfer functions, in general, in control theory are given the symbol H(s). Most commonly in electronics, transfer function is defined as the ratio of output voltage to input voltage and given the symbol A(s), or more commonly (because analysis is invariably done in terms of sine wave response), ''A''(''jω''), so that;
<math display="block">A(j\omega)=\frac{V_o}{V_i}</math>▼
The ''A'' standing for attenuation, or amplification, depending on context. In general, this will be a complex function of ''jω'', which can be derived from an analysis of the impedances in the network and their individual transfer functions. Sometimes the analyst is only interested in the magnitude of the gain and not the phase angle. In this case the complex numbers can be eliminated from the transfer function and it might then be written as;▼
▲<math>A(j\omega)=\frac{V_o}{V_i}</math>
<math display="block">A(\omega)=\left|{\frac{V_o}{V_i}}\right|</math>▼
▲The A standing for attenuation, or amplification, depending on context. In general, this will be a complex function of ''jω'', which can be derived from an analysis of the impedances in the network and their individual transfer functions. Sometimes the analyst is only interested in the magnitude of the gain and not the phase angle. In this case the complex numbers can be eliminated from the transfer function and it might then be written as;
▲<math>A(\omega)=\left|{\frac{V_o}{V_i}}\right|</math>
====Two port parameters====
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