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Electronic filter

Filters are electronic circuits which allow electronic signals of certain frequencies to pass through the filter, while blocking or attenuating electronic signals of other frequencies. Filters are essential to the operation of most electronic circuits. Filters are implemented in electronic circuits to alter the amplitude and/or phase characteristics of a signal with respect to frequency. Electrical filters are utilized to transmit desired electrical signals by selecting or rejecting one or more signal components, related to frequency. Many different types of filters are known for the processing of electrical signals. Filters may generally be grouped as lowpass, highpass, bandpass and bandstop filters depending on their characteristics. Digital filters are used in a variety of communication systems which typically transmit and receive amplitude and/or phase modulated signals across a communication channel. Radio systems using spread spectrum modulation techniques are becoming increasingly popular for a variety of communication applications. Radio transmitters and receivers require filters to remove or suppress unwanted frequencies from being transmitting or received. Surface acoustic wave (SAW) filters are frequently used in commercial and other applications as RF and IF filters to provide frequency selectivity and other electronic functions. A surface acoustic wave filter formed of such an SAW (surface acoustic wave) device includes a piezoelectric substrate on which are formed interdigital transducers (IDTS) having interdigital electrodes and reflectors having grating electrodes. Bandpass and band-rejection filters have been widely used to control the flow of signals that propagate in electronic circuits. A bandpass filter is an electrical filter used to pass the spectral components of a signal falling within a predetermined range of frequencies while attenuating the frequency components above and below that range. A band rejection filter, however, is an electrical filter that rejects or suppresses a band of frequencies. A low pass filter passes low frequency electrical signals, while rejects high frequency electrical signals. Conversely, a high pass filter suppresses the frequency electrical signals, while passes high frequency signals.

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Electronic filter categories

Band reject filter (0) Bandpass filter (0) BAW filter (0) EMI filter (0) EMI/RFI shields (20) Harmonic filter (0)

High pass filter (0) Low pass filter (0) RFI filter (0) SAW filter (3) Waveguide filter (0)

Electronic filter product listings

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