In need of active bandpass filter schematic

[WinterInJuly]

I want to design a bandpassfilter that is used for IR_Detector, the frequency is 36Khz-40Khz and the output signal is always active low when the signal passes and active high when no signal. Does any one give me the schematic or documentation....?
Thanks and best regards

 

[gevy]

Re: IR_Filter circuit

I think that such device should include the bandpass filter and comparator.

 

[WinterInJuly]

Re: IR_Filter circuit

I want to design an analog circuit, not use an IC to replace.
As far as I know, this ciruit includes: Amplifier+BandpassFilter+Intergrator+Comparator

 

[power-twq]

Re: IR_Filter circuit

for these low frequency, you can use active bandpass filter.

please visit www.ti.com for document on active filter design.


best regards

I want to design a bandpassfilter that is used for IR_Detector, the frequency is 36Khz-40Khz and the output signal is always active low when the signal passes and active high when no signal. Does any one give me the schematic or documentation....?
Thanks and best regards