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Active Filters: Band Pass
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Active Filter -- Main Page
Last Updated on:
Friday, March 23, 2012 04:35 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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Mikhael-Bhattacharyya (MB) Second Order Bandpass non-inverting - Schematic only,
no text included |
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Multiple Feedback (MFB) Second Order Bandpass II inverting - Schematic only, no
text included |
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Multiple Feedback Bandpass Filter - (electronic circuit added 7/03) |
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Multiple Feedback Band-pass Filter - ....(spice design added 02/09) |
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Narrow Band Audio Bandpass
Filter - This audio bandpass filter is useful for amplification and filtering of
weak AM TV video carriers. For example, a DFM (digital frequency audio multimeter) may
have insufficient input sensitivity for measuring extremely weak SSB TV video audio
signals. By using the 20 Hz filter to peak the wanted carrier, the DFM will display the
carrier frequency....[By Tony Mann and Todd Emslie] |
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Narrow Band Audio Bandpass Filter - (electronic circuit added 7/03) |
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OA-28: OA-28 Low-Sensitivity, Bandpass Filter Design with Tuning Method -
National Semiconductor Application Note (app note added 2/06) |
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Sallen-Key (SK) Second Order Bandpass non-inverting - Schematic only, no text
included |
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Self Tune Filter - Electroinic circuit design…. [from Harry Lythall's website] |
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signal processor DSP for radio communications - (diagram added 2/07)
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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....(app note added 6/06)
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Single Op-Amp Bandpass Filter - A bandpass filter passes a range of frequencies
while rejecting frequencies outside the upper and lower limits of the passband. The range
of frequencies to be passed is called the passband and extends from a point below the
center frequency to a point above the center frequency where the output voltage falls
about 70%.... (added 2/07) |
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Tow-Thomas (TT) Second Order Bandpass inverting - Schematic only, no text
included |
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Twin-T Second Order Bandpass inverting - Schematic only, no text included
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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%.... [Designed by David A. Johnson] |
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Active Filters: Band Pass
- #'s - B
C - K
L - Z |
