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band pass filter design

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jerryvdk

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Hi,

I want to design a bandpass filter with range 50KHz to 2MHz. Can i design it using opamp?
Anyone help me please..
 

LvW

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Hi,

I want to design a bandpass filter with range 50KHz to 2MHz. Can i design it using opamp?
Anyone help me please..

This information is by far not sufficient.
Question: Center frequency to be tuned from 50k to 2 MHz (or bandwidth from 50k....2MHz)?
Any gain/damping requirements in the passband?
No selectivity requirements?
 

FvM

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Yes.
If you have more specific questions, you should tell.
 

jerryvdk

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Lower cutoff frequency is 30KHz
Higher cutoff frequency is 3MHz

Centre frequency must be tuned in between..
 

LvW

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Lower cutoff frequency is 30KHz
Higher cutoff frequency is 3MHz

Centre frequency must be tuned in between..

That's an interesting specification: Fixed passband (fixed lower/higher cut-off) with a tunable center frequency.
Jerry, please read your answer again.
 

jerryvdk

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Iam trying to say it must be tunable i.e. we have to control -> change the lower cut off frequency
 

LvW

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Jerry - sorry, but do you know what you are talking about?
A filter that is characterized by its lower cut-off is a high pas filter.
However, in your first posting you spoke about a bandpass.

Some basics:
A bandpass is described by (1) its center frequency (2) its bandwidth (lower und upper cut-off) and (3) by some attenuation requirements inside and outside the bandwidth. This results in a minimum order the transfer function must have.
More than that, if tuning is required, the tuning range is to be given and - a very critical requirement - if the bandwidth or the q-factor must be kept constant.
More than that, tuning requirements must be described in detail: passive R- or C- tuning ? Or electronic tuning (with control voltage) ?

Nobody can give you some hints if you don't deliver sufficient information. Sorry.
 

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If you're not familiar with usual technical terms of filter specification, you may want to sketch the intended transmission characteristics as array of curves.
 

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