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Passive Filters:  Band Pass  Circuits
Passive Filters -- Main Page


Last Updated: June 02, 2021 01:44 PM

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Band pass Filter & Product Detector-  Scroll down to find this one.  Please refer to Figure 2.  The second stage constructed was the double tuned band pass filter.  You will need about 50-54 pF to resonate L1 and T1 at 7.040 MHz.  The C1 and C2 values chosen are thus perfect for tuning the 40 Meter CW band.  I peaked my particular front end filter at a center frequency of 7.025 MHz using a 50 ohm output impedance RF generator and then did some fine tuning with an antenna connected after the receiver was constructed. __

Bandpass Filter #1-  This circuit is taken from Progressive Communications Receiver in most of recent ARRL Handbooks.  Values for40 meter band are shown. __ Designed by Web David White, WN5Y

Bandpass filter features adjustable Q & constant maximum gain-  3-Mar-05 EDN Design Ideas:  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 by Herminio Martínez, Joan Domingo, Juan Gmiz, and Antoni Grau, Technical University of Catalonia, Barcelona, Spain

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 by Richard M Kurzrok, RMK Consultants, Queens Village, NY

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 by Gary Sellani, Maxim Integrated Products, Sunnyvale, CA

Wideband filter uses image parameters-  26-Oct-00 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 by Richard M Kurzrok, RMK Consultants, Queens Village, NY

Passive Filters:  Band Pass Circuits

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