Hi,
I built an Active Filter Butterworth 8 order.
I receive at the output noise of 5mVptp.
Does anyone know why i receive a very high noise at the output ?
Thanks !
This looks like a 6th order bandpass filter (three, 2nd order Delyiannis-Friend circuits)............
It shouldn't be surprizing to see noise mainly in the pass band of a band pass filter, isn't it?The frequency of the noise is around 50KHz.
Can be assumed to be a result of component value tolerancesThe total Gain design to 0dB but i measure G= -2.5dB
Review your analog design text book. Noise gain is another word for the inverse feedback factor of an OP circuit. A noise voltage feed to the OP input (e.g. the OP's input noise) appears at the output amplified by the noise gain. It' e.g. about 240 for the first filter stage.How can i receive noise gain if the there no Gain?
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