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Passive Filters: Band Pass Circuits
Last Updated on:
Wednesday, May 14, 2008 03:33 PM |
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Passive Filters -- Main Page |
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| Links to electronic circuits,
electronic schematics, designs for engineers, hobbyists, students & inventors: |
| Bandpass Filter: This circuit is taken from the Progressive
Communications Receiver in most of the recent ARRL Handbooks. Values for the 40 meter band are shown. (Electronic circuit design added 02/05) |
| Band-pass filters: (Electronic circuit design added 02/05) |
| Components of a simple bandpass filter: (Electronic circuit design added
02/05) |
| Notch Filter Is DC Accurate: 03/02/95 EDN Design Ideas / (circuit added
7/02) 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.... |
| Wideband Filter Only Has Two Different Components: 01/21/02 Electronic
Design - Ideas for Design / (Circuit added 9/04) Wideband filters with bandwidths in excess of an octave can be created by cascading a
high-pass filter and a low-pass filter. In this design idea, nine-pole high-pass and low-pass filters have been constructed using a modified
equal-element design. A. . . |
| Wideband Filter uses image Parameters: 10/26/00 EDN-Design Ideas / (added
05/03) / PDF contains multiple circuits - scroll to find this circuit |
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