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Active Filters: Band Pass
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Active Filter -- Main Page
Last Updated on:
Monday, October 03, 2011 06:07 PM |
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Circuits Designed by Dave Johnson, P.E. : |
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ULTRA PURE 125KHz 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%.
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Links to electronic circuits,
electronic schematics, designs for engineers, hobbyists, students & inventors:
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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....(electronic circuit added 7/03) |
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Active Bandpass Filters - (electronic circuit added 7/03) |
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Akerberg-Mossberg (AM) Second Order Bandpass inverting - Schematic only, no text
included |
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Akerberg-Mossberg AM Second Order Bandpass inverting - (electronic design added
6/07) |
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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] |
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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.….(electronic
schematic added 12/08) |
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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] |
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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. (added 5/02) |
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Bandpass Filters - (diagram added 2/07) |
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Band-pass Network - Circuit Ideas for Designers Application Notes Advanced
Linear Devices, Inc. (app note added 6/06) |
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Basic Introduction to Filters - Application notes on active, passive and
switched capacitor filters, document in PDF format (app note added 4/02) |
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Berka-Herpy (BH) Second Order Bandpass non-inverting - Schematic only, no text
included |
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Berka-Herpy BH Second Order Bandpass non-inverting - (electronic design added
6/07) |
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Biquad Active Bandpass Filter Schematic - (electronic circuit added 7/03)
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Active Filters: Band Pass
- #'s - B
C - K
L - Z |
