B7 - Section B7: Filtering As mentioned at the end of the...

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Section B7: Filtering As mentioned at the end of the previous section, simple rectification results in a pulsating dc voltage at the output, also known as output ripple . These deviations from the desired dc may be reduced by the process of filtering . The simplest form of filter uses a single parallel resistor-capacitor combination. Recall, from the olden days of circuit analysis, that this creates an exponential decay curve as the capacitor discharges with a time constant τ =RC. So (using the full-wave rectified output as an example). .. what we Therefore, the voltage ripple, min max V V V v r = = is significantly reduced by this technique. NOTE: The figures above represent a rectified signal that is only positive and is used to generate a positive dc voltage. A negative dc voltage may also be generated by creating a purely negative signal (flipped about the time axis). V max and V min indicate the magnitudes of the respective voltages and may be either positive or negative.
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B7 - Section B7: Filtering As mentioned at the end of the...

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