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Passive Filters:
Band Pass Circuits
Passive
Filters -- Main Page
Last Updated on:
Saturday, June 27, 2009 04:43 PM |
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Links to electronic circuits,
electronic schematics, designs for engineers, hobbyists, students & inventors:
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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) |
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Band-pass filters: (Electronic circuit design added 02/05) |
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Components of a simple bandpass filter: (Electronic circuit design added
02/05) |
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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.... |
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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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