looking for a high pass filter audio ic

[arenwi]

Hello to every body, and congartullations for tis forum.

I´m trying to make audio measurements with a machine who will work with a pump (who genarates a low frecuency noise). After I will analize it with a dsp (it is doned).

I´m having problems with some noise in low frecuencies, I like to eliminate this frecuencies (becouse i don´t need it), i´m looking betwin 200 - 10Khz only.

I would like to find an active high pas filter integrate circuit with tuenable frecuenci but with a good order on the filter (like 4 or 8). If it is a band pass filter for audio is also ok.

Many thaks for your help

Aren from Spain

 

[JMFahey]

Hi Aren.
There is not a ready made IC because it's not needed, it can be easily designed and made with Op Amps, the "universal building blocks" ..

Search for high pass Op Amp filters, post schematics here and we may help you to choose one and fine tune it for your needs.

Also tell us about the sound source: is it some kind of microphone, magnetic or piezo pickup, some other kind of transducer?

 

[abraxalito]

Linear Technology has what you want here - LTC1064 - Low Noise, Fast, Quad Universal Filter Building Block - Linear Technology

 

[arenwi]

Many thanks for your answer.

JMFAHEY It is a part of a big desing for this I would like to find integrated circuits trying to use the less quantyty of components.

Abraxalito, many thanks for your information, if I didn´t find anything easyer I will try this IC
Somebody now anothe filter ci?? with less feets that LTC1064

best regards and many thanks

Arenwi

 

[sreten]

Hi,

The LTC1064 is a tunable filter that you simply don't need.
All you need is a fixed filter, and that is standard theory
using op-amps, one will do a 3rd order butterworth.
Its unlikely you will need more than that.

rgds, sreten.

 

[arenwi]

Hi sreten I thought that buterworth is a low pass filter for antialiasing and things like this. BUt I´m lookin for a hight pass filter

 

[sreten]

Hi,

Butterworth or any filter for that matter can be high or low pass.

rgds, sreten.

 

[arenwi]

ok i will study that

many thanks

 

[peranders]

I would like to find an active high pas filter integrate circuit with tuenable frecuenci but with a good order on the filter (like 4 or 8).

8th order filter is ultra extreme and hard to design. I'll suspect that 4th order is the maximum you can build. Why don't you go to TI.COM and use their filter software for designing?