Changes

Analyzing Circuits Using Predefined Tests

79 bytes added, 21:22, 10 November 2016
/* Network Analysis */
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 <td> [[File:b2MAN_Fig56.png|thumb|200pxleft|250px|Network Analysis Settings: First Page.]]
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<td> [[File:b2MAN_Fig57.png|thumb|200pxleft|250px|Network Analysis Settings: Second Page.]]
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<td> [[File:b2MAN_Fig58.png|thumb|200pxleft|250px|Network Analysis Settings: Third Page.]]
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</table>
 [[File:b2MAN_Fig237.png|thumb|left|300px|The RLC circuit of Tutorial Lesson 2.]]
As an example, consider the simple RLC circuit of Tutorial Lesson 2, which is shown here in the opposite figure. First, we treat this circuit as a one-port network, with its port established at the voltage source. The characteristic or reference impedance Z0 is set to its default value of 50 Ohms. The frequency sweep is set from 1MHz to 1GHz on a decade scale with 50 points per interval. The figures below show the Z/Y/S parameters of this one-port network plotted on both Cartesian graphs and Smith chart.
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[[File:b2MAN_Fig233.png|thumb|640pxleft|720px|Cartesian plot of the real and imaginary parts of the Z11 parameter.]]
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[[File:b2MAN_Fig234.png|thumb|640pxleft|720px|Cartesian plot of the real and imaginary parts of the Y11 parameter.]]
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[[File:b2MAN_Fig235.png|thumb|640pxleft|720px|Cartesian plot of the magnitude and phase of the S11 parameter.]]
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[[File:b2MAN_Fig236.png|thumb|640pxleft|720px|The S11 parameter plotted on a Smith chart.]]
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[[File:b2MAN_Fig238.png|thumb|640pxleft|720px|Cartesian plots of the magnitude of the S11, S12, S21 and S22 parameters.]]
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[[File:b2MAN_Fig239.png|thumb|640pxleft|720px|The S11, S12, S21 and S22 parameters plotted on a Smith chart.]]
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<table>
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<td> [[File:Net1.png|thumb|200pxleft|250px|Network Analysis Settings: Connections Tab.]]
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<td> [[File:Net2.png|thumb|200pxleft|250px|Network Analysis Settings: Sweep Tab.]]
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<td> [[File:Net3.png|thumb|200pxleft|250px|Network Analysis Settings: Output Tab.]]
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</table>
[[File:RFAC3.png|thumb|600pxleft|640px| An RF circuit consisting of a two-port network and connecting transmission line segments.]]
As an example, consider the RF circuit shown in the opposite figure, which was earlier examined in the discussion of AC frequency sweep test. This circuit can be treated as a one-port network with its input port defined between nodes 2 and 0, i.e. between the source's internal resistor and the input T-line segment. As a one-port, the circuit has a single s11 and a single z11 parameter. The first figure below shows the Smith chart for the return loss (s11) over the frequency range 1-10 GHz at larger steps of 100MHz. The second figure below shows Cartesian plots of the real and imaginary parts of z11 over the same frequency range both with finer steps of 10MHz.
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<td> [[File:Net4.png|thumb|640pxleft|720px|Smith Chart.]]
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<td> [[File:Net5.png|thumb|640pxleft|720px|Cartesian graph of Z-parameters.]]
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