Passive filters use only passive components such as resistors, capacitors and inductors. They do not produce any amplification of the input signal. In passive filters, the size and arrangement of these electrical and electronic components determines which frequencies are allowed to pass. Typically, passive filters use resistor-capacitor (RC), resistor-inductor (RL), inductor-capacitor (LC), or resistor-inductor-capacitor (RLC) circuits. Resistors are two-terminal devices which resist an electric current by producing a voltage drop across its terminals. Inductors block high-frequency signals and conduct low-frequency signals. By contrast, capacitors block low-frequency signals and conduct high-frequency signals.
There are many types of passive filters, but basic categories include low pass, high pass, band pass, and universal or programmable. Low pass filters attenuate frequencies below a frequency called the cut-off frequency. High pass filters attenuate frequencies above the cut-off frequency. Bandpass filters are used to attenuate frequencies above and below a range of frequencies (i.e., the bandwidth or passband of the filter). Any signal with a frequency within the bandpass range passes through these passive filters. Conversely, any signal with a frequency outside the bandpass is reduced. Universal passive filters can be configured by the user to function as a low pass, high pass, or band pass filter. Coupled resonant band pass filters are also available.
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active bandpass filters passive band pass filters passive high pass filters passive low pass filters NE5533 / NE5534 low noise operational amplifier data sheet - (109K) in |
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band pass filters LC Band pass filters are usually LC filters containing resonator combinations of inductance and capacitance which are designed mathematically to |
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Passive Filters Passive Filters Frequency-selective or filter circuits pass to the output only those input signals that are in a desired range of frequencies (called |
| Part # | Distributor | Manufacturer | Product Category | Description |
|---|---|---|---|---|
| 4CHANNEL PASSIVE FILTER | netCOMPONENTS | Not Provided | Not Provided | Not Provided |
| 4CHANNEL PASSIVE FILTER | netCOMPONENTS | Not Provided | Not Provided | Not Provided |
| 308-1352-ND | Digi-Key | Sumida Corporation | Filters | CHOKE COMMON MODE 33MH PC MNT |
| 308-1368-ND | Digi-Key | Sumida Corporation | Filters | CHOKE COMMON MODE 12MH PC MNT |
| 308-1384-ND | Digi-Key | Sumida Corporation | Filters | CHOKE COMMON MODE 28MH PC MNT |
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