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Active Filters: Band Pass, Page 1
#'s - B       C - K       L - Z
Active Filter -- Main Page
Last Updated on: Tuesday, August 18, 2015 06:50 AM

 
Circuits Designed by Dave Johnson, P.E. :
  • 125Khz Ultra Pure Sine Wave Signal Source  -  For some RFID systems operating at 125KHz, a very low distortion signal source reference is needed.  The circuit shown on this page produces a 10-volt peak-to-peak signal into a 50-ohm load, with a distortion of only 0.01% . . . [Hobby Circuit designed by David Johnson P.E.,  02/11/02]


Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

125Khz Ultra Pure Sine Wave Signal Source -  For some RFID systems operating at 125KHz, a very low distortion signal source reference is needed.  The circuit shown on this page produces a 10-volt peak-to-peak signal into a 50-ohm load, with a distortion of only 0.01% . . . [Hobby Circuit designed by David Johnson P.E.,  02/11/02]

 

12dB/Octave 2-Way Xover -  Linkwitz-Riley alignment and phase coherent (uses the P09 Rev-B PCB)   … [Rod Elliott (ESP)]

 

24 dB/Octave 2/3-Way Linkwitz-Riley electronic crossover -  The Linkwitz-Riley filter featured here has (almost) perfect phase-coherency, with no peaks or dips at the crossover frequency. The design is adaptable to 2-way or 3-way (or even 4-way) operation, and all formulas) … [Rod Elliott (ESP)]

 

29.85 MHz Bandpass Filter Schematic -  Schematic only, no circuit description… [Email Dale Heatherington: dale111 AT wa4dsy.net ]

 

45 to 90Hz hum filter -  These emit noise to confuse or agitate insects or animals.This is one of the better and more popular brands. It emits bursts of pulses at different frequencies. I did not find any spider webs inside this unit… [Circuit by Stepan Novotill]

 

A Basic Introduction to Filters: Active, Passive & Switched-Capacitor -  National Semiconductor Application Note…

 

A Simple Method of Designing Multiple Order All Pole Bandpass Filters by Cascading 2nd Order Sections -  AN27A Linear Technology Presents two methods of designing high quality switched capacitor bandpass filters. Both methods are intended to vastly simplify the mathematics involved in filter design by using tabular methods. The text assumed no filter design experience but allows high quality filters…

 

Active 2nd Order Filters -  The figures below illustrate using opamps as active 2nd order filters. Three 2nd order filters are shown, low pass, high pass, and bandpass. Each of these filters will attenuate frequencies outside their passband at a rate of 12dB per octave or 1/4 the voltage Amplitude for each octave of frequency increase or decrease outside the passband… [Bill Bowden, designer]

 

Active bandpass filter with TDA2320A -  Schematic only.… [by Guy Roels ON6MU]

 

Akerberg-Mossberg (AM) Second Order Bandpass inverting -  Schematic only, no text included…

 

BandPass Filter -  This bandpass filter is in fact a combined high- and lowpassfilter. The first stages are a highpass (f>70MHz) and the last stages a low pass (f<180MHz). The lost of this filter is several watts when driven with 20[Watts], but the output signal is (when adjusted with a spectrum analyser) very clean…

 

Bandpass filter features adjustable Q and constant maximum gain -  03/03/05  EDN Design Idea   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, sta… [by Herminio Martínez, Joan Domingo, Juan Gmiz, and Antoni Grau, Technical University of Catalonia, Barcelona, Spain]

 

Bandpass Filter Single Opamp -  A band pass filter passes a range of frequencies while rejecting frequencies outside  upper and lower limits of  passband. The range of frequencies to be passed is called  passband and extends from a point below  center frequency to a point above  center frequency where  output voltage falls about 70% of  output voltage at  center frequency.…

 

Bandpass Filters -  LC Band pass filters are usually LC filters containing resonator combinations of inductance and capacitance which are designed mathematically to respond to design frequencies while rejecting all other out of band frequencies. Because LC bandpass filters have inherent limitations these statements should not be taken too literally. … [by Ian C. Purdie VK2TIP]

 

Band-pass Network -  Circuit Ideas for Designers App Note - … [Advanced Linear Devices, Inc]

 

Band-reject filter includes compensation -  04/13/00 EDN Design Idea   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 achi… [by Richard M Kurzrok, RMK Consultants, Queens Village, NY]

 

Basic Introduction to Filters -  App Note - on active, passive and switched capacitor filters, document in PDF format…

 

Berka-Herpy (BH) Second Order Bandpass non-inverting -  Schematic only, no text included…

 

Biquad Active Bandpass Filter Schematic -  …

 

Cascade bandpass filters for higher Q -  02/15/00 EDN Design Idea    witched-capacitor filters that are preset for a given bandwidth sometimes do not deliver the bandwidth or Q an application requires. By inverting the clock between two switched-capacitor bandpass filters, such as the MSFS1 from … [by rong Huynh and John Ambrose, Mixed Signal Integration Corp, Santa Clara, CA]

 

Chebyshev Bandpass Filter -  …

 

Chebyshev/Butterworth Filters -  This program was written in PC-BASIC for automated design of Chebyshev and Butterworth filters in the low-pass, high-pass, band-pass and band-stop configurations. These filters are composed of a series of circuit branches which are alternately connected in series or shunt with the source-to-load path. In low-pass and high-pass filters, each branch is either a capacitor or an inductor. In band-pass and band-stop filters… [Milazzo, Carol F., KP4MD]

 

Constant-impedance IF bandpass filters improve circuit performance -  Application Note MiniCircuits.com…


Active Filters: Band Pass - #'s - B       C - K       L - Z


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