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Passive Filters:  Band Pass Circuits
Passive Filters -- Main Page
Last Updated on: Friday, October 03, 2014 10:38 AM

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Band reject filter includes compensation -  04/13/00 EDN-Design Ideas....Some band-reject LC filters employ a reactance to decouple individual resonators. One such filter uses relatively small shunt inductors to decouple series resonators, known as a top-L coupling.  This type of coupling readily achieves narrow filter bandwidths while.... [Design Idea by Richard M Kurzrok, RMK Consultants, Queens Village, NY]
Bandpass Filter #1 -  This circuit is taken from  Progressive Communications Receiver in most of  recent ARRL Handbooks. Values for  40 meter band are shown. (added 02/05)
Bandpass filter features adjustable Q and constant maximum gain -  3-Mar-05 Issue of EDN  Applications such as audio equalizers require bandpass filters with a constant maximum gain that's independent of the filter's quality factor, Q. However, all of the well-known filter architectures—Sallen-Key, multiple-feedback, state-variable, and Tow-Thomas—suffer from altered maximum gain when Q varies.... [Design Idea by Herminio Martínez, Joan Domingo, Juan Gmiz, and Antoni Grau, Technical University of Catalonia, Barcelona, Spain]
Basic Introduction to Filters: Active, Passive & Switched-Capacitor -  National Semiconductor Application Note....[App Note]
Components of a simple Bandpass filter -  Electronic Circuit / Schematic c (added 02/05)

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Notch Filter is DC Accurate -  03/02/95 EDN-Design Ideas....Most active filters exhibit noise, distortion, gain error, and dc offset. However, a filter topology that separates the dc and ac paths can eliminate the last two of these unwanted behaviors (Fig 1a). The dc path in this circuit has no op amps and, therefore, no dc offset. The dc path does not have a dc gain error other than -6 dB of attenuation that the R1/R2 divider causes. (This attenuation is absent if you omit the R2 termination.) The ac path consists of C1 and a synthetic inductor comprising two wideband transconductance amplifiers and associated components. The result is an active circuit that emulates the passive filter of Fig 1b....[Design Idea by Gary Sellani, Maxim Integrated Products, Sunnyvale, CA]
Notch Filter is DC Accurate -  03/02/95 EDN-Design Ideas…. EDN is migrating links. This link is not verified.  Search the "title" + "EDN" for new link.
Wideband filter uses image parameters -  26-Oct-00 Issue of EDN-Design Ideas....You can design various lowpass and highpass filters using image parameters ( Reference 1 and Reference 2 ]. By cascading a highpass and a lowpass filter.…PDF has several circuits, please scroll to find this one.… [Design Idea by Richard M Kurzrok, RMK Consultants, Queens Village, NY]

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