good day!

i am planning to create a multiple band pass op-amps, meaning i am allowing to pass different set of frequencies that desired, for example 3

frequencies from a remote transmitter let say 25khz, 30khz, and 40khz respectively. now i dont want to use MCU because it needed programming, i just

want to use 3 set of pass-band op-amps for the 3 desired frequencies, from a single receiver. its still a concept from me if this concept will work

using discrete components and not using mcu's. the actual application will be on controlling output stage with IR transmitter with

pre-determined frequencies. heres the block diagram

hope you can give ideas with this one

thanks in advance!

 

The frequencies are quite close so you will probably need filters with a good out of band rejection. Depends on how much off-frequency leakage you are willing to allow into each channel - what levels of the 30kHz and 40Khz signals are permitted into the 25kHz channel, say.

You haven't given much to work on.

 

the actual frequency that i will use is around 38khz up to 40khz, and i want this to divide on several frequencies let say around 3, are these possible, given that the first stated is too much close as what you said and this time i want to divide the 2khz band to the desired channels?.

and if it is, what type of op-amp configuration circuits id needed thanks.

 

You may be able to do that with PLL's. Bandpass filters would be horendous.

 

http://focus.ti.com/lit/ml/sloa088/sloa088.pdf