About Passive Filters
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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Engineering Web: Passive Filters
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A Basic Introduction to Filters - Active, Passive and... Note 779 Kerry Lacanette Filters Active Passive April 1991 Introduction and Switched-Capacitor 1 0 INTRODUCTION Filters of some sort are essential to See National Semiconductor Information |
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OA-26 Designing Active High Speed Filters See National Semiconductor Information |
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Electrocube Power Components of high quality products such as film capacitors , RC networks, EMI filters, foil transformers, and many other custom designed passive components. See Electrocube, Inc. and Seacor products Information |
Part Numbers for Passive Filters
| 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 |
| ACM2520-451-2P | Digi-Key | TDK Corporation | Filters | CHOKE COMMON MODE 450 OHM SMD |
| TCM1210-900-2P-T | Digi-Key | TDK Corporation | Filters | CHOKE COMMON MODE 90 OHM SMD |
| TCM2010-261-4P-T | Digi-Key | TDK Corporation | Filters | CHOKE COMMON MODE 260 OHM SMD |
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