Filters

Different filters and their impact on the original waveform. For pulse and all other waves except sinewave they have a strong reshaping effect. For instance a an RC circuits reshape the original pulse by either smoothing the fronts or creating a negative and a positive (short) voltage spike. Same applies to the RL filters but just in reverse. I mean capacitors and inductors have similar properties but for instance when using them in filtering they must be put correctly (caps-parallel inductors-series). And when you add them in an LC circuit their reciprocity allows them to build up charge and enter resonance state. Theoretically the charge will keep building up indefinitely and its amplitude also but you all know that theoretically is not always in practice due to the losses in the elements and all but the increase in the amplitude is at least a few times the original. This is when they both act like tanks and keep transferring charge from one another. Their applications involve RF filtering where you need to tune it to a specific frequency (the one at which the LC filter resonates on). Also one important application is their use in rectifiers and more specifically smoothing the rectified ripples (acting as tank circuits). They act a significant role in oscillators and characteristic inductance and capacitance are important factors that need attending to in transmission lines.

published 11 years ago