Hey everyone
I've got kind of an interesting problem. I'm working with some very low frequency and low noise measurements, and we need a low pass filter with a cutoff frequency of somewhere in the range 0.1Hz to 10Hz (not really critical). I'm not really concerned with the steepness of the filter, nor the topology (chebychev, butterworth, elliptical... doesnt matter) The point of it is to filter out 60Hz harmonics noise that is coupling into the measurement lines (and other noise in the ~10Hz order of magnitude).
The trouble is, since it must be a low-noise filter, large resistors arent viable and neither are inductors (it would be best if NO inductors were used.) Also, the filter cannot be active, it must have passive components only.
I'm new to filter design and was wondering if anyone has any ideas to get around these problems.
thanks!
I've got kind of an interesting problem. I'm working with some very low frequency and low noise measurements, and we need a low pass filter with a cutoff frequency of somewhere in the range 0.1Hz to 10Hz (not really critical). I'm not really concerned with the steepness of the filter, nor the topology (chebychev, butterworth, elliptical... doesnt matter) The point of it is to filter out 60Hz harmonics noise that is coupling into the measurement lines (and other noise in the ~10Hz order of magnitude).
The trouble is, since it must be a low-noise filter, large resistors arent viable and neither are inductors (it would be best if NO inductors were used.) Also, the filter cannot be active, it must have passive components only.
I'm new to filter design and was wondering if anyone has any ideas to get around these problems.
thanks!
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