![]() The output voltage from the filter is measured across 元 and C3. In this circuit, the source (V2) sends a signal into a bandpass filter, and the output from this portion (the voltage across the capacitor) is input into the bandstop filter. ![]() While you may not encounter this type of filter in general practice, you’ll come pretty close when you’re designing a matching circuit for a multiband antenna. The circuit shown in the schematic below is a rather complex filter. Fortunately, when dealing with complex filters, you can determine many aspects of signal behavior Analyzing a Complex Filter Circuit Even as a math guy, I’m no fan of higher degree polynomial problems. At this point, the problem usually involves decomposition or direct solution of a 3rd degree or higher polynomial, which becomes unmanageable by hand. Circuits for advanced applications, such as wideband or multiband matching circuits for RF components, can quickly become difficult to analyze by hand.īut as the number of resonant frequencies in a complex filter exceeds 2 or 3, the problem can quickly become intractable. The circuits were usually tractable with Ohm’s law and Kirchoff’s laws, as long as there was no feedback in the circuit. I remember spending hours on circuit analysis problems in my electronics classes, and I learned to analyze all sorts of filter/amplifier configurations by hand.
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