need for a low pass filter with cutoff frequency around 10mhz

[mostafah67]

Hi all
As I said I need a lowpass filter with cutoff frequency around 10Mhz, the most important thing i need is that the filter response in transition region is linear as much as possible,and it decrease monotonically because I use the filter In this region and it is important that filter response in this region was such,I think a 5 or 6 order chebyshev filter has such feature, what's your idea? Which kind of filater is better?

 

[LvW]

Which frequency? Milli or Mega-Hertz?
Which slope requirements in the transition region?
Why do you assume that a Chebyshev response has "such a feature"? Why not Butterworth, for example?

 

[mostafah67]

Which frequency? Milli or Mega-Hertz?
Which slope requirements in the transition region?
Why do you assume that a Chebyshev response has "such a feature"? Why not Butterworth, for example?

hi, thanks for your answer
-10 mega hertz i mean
-about why chebyshev filter, i mistook and i meant butterworth filter because i saw its response and i guessed it' would be appropriate.
- and about the slope of the filter in transition region, in fact i want to use this filter as a frequency to voltage converter and so i think it slope should be large enough so that it can accurately sense the variation in frequency.
what do you think, can i use a filter as F/V or there are better choices for this work?!

 

[FvM]

A V/f converter counts signal edges or measures period time and generates a DC voltage proportional to the frequency, preferably independent of the signal amplitude.That's quite different from a filter.

 

[mostafah67]

ok thanks , i need to know more about frequency to voltage converters and it's principles, do you know any good reference?