![]() LPF is a circuit that is designed to reject unwanted higher frequency of electromagnetic signal, audio signals, electrical signals and accepts only those signal which is required in the applicational circuits. ![]() Low pass filter (LPF) is a filter that allows signals with a frequency lower than a particular frequency (that particular frequency is called cutoff frequency).Īnd does not allow the signals of frequencies higher than the cutoff frequency. The main categories of the filters are high pass filter low pass filter Bandpass filter, notch filter/band-reject filter. The frequency range can be all frequency less than particular frequency, the difference between two predetermined frequency, or frequencies above particular frequency. Similarly, filters are the device or circuits which are used where only the required range or a frequency is required. Have you ever heard of strainer? if yes then you must know the use of strainer, it is used for straining solids from liquids, or for separating coarser particles from finer particles, in short, the strainer is used to filter out the unwanted impurities in the solution or liquid and allow only what is required. Before understanding the low pass filter let’s look at what is a filter.
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