Variable band pass filter

  • Thread starter akipro
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Main Question or Discussion Point

Is there an easy way of designing a band pass filter whose pass band could be varied over a certain band??

The pass band is in MHz range.

Thanks
 

Answers and Replies

  • #2
sophiecentaur
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If you need an audio bandwidth then look at old MF receiver tuning circuits. They always used air spaced variable capacitors with fixed coils. If you have a difficult band pass requirement, you might consider an IF based system with an oscillator and mixer. That's the standard approach for receivers.
 
  • #3
NascentOxygen
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Is there an easy way of designing a band pass filter whose pass band could be varied over a certain band??

The pass band is in MHz range.
Are you wanting to make this using OP-AMPs or LC tuned circuits? How many 2nd order stages do you need to cascade?

The easiest way is to use someone else's design. :approve:
 
  • #4
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Are you wanting to make this using OP-AMPs or LC tuned circuits? How many 2nd order stages do you need to cascade?

The easiest way is to use someone else's design. :approve:

If I could find someone else's design I would do my job, but the problem is where to find that design
 

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