Hi,
I have a SHARP gp2d120 IR distance sensor. When I apply the required 5 volts to it and watch the output on the scope I noticed some noise at a frequency of 948kHz which I want to get rid of.
As such I tried putting together a very quick passive lowpass filter to get rid of the noise. However, after putting the sensor's output through the low pass filter, I notice noise on the power supply and even more noise on the sensor output.
The filter elements are as follows: 13k resistor, 100nF ceramic cap giving me a cutoff frequency of 122.4Hz which should be fine, as anything useful is in frequencies lower than that.
Any ideas why I am getting even more noise after applying this low pass filter, and noise on the power supply in addition, I must be doing something really stupid. Would an active filter get rid of some of these problems?
Regards
I have a SHARP gp2d120 IR distance sensor. When I apply the required 5 volts to it and watch the output on the scope I noticed some noise at a frequency of 948kHz which I want to get rid of.
As such I tried putting together a very quick passive lowpass filter to get rid of the noise. However, after putting the sensor's output through the low pass filter, I notice noise on the power supply and even more noise on the sensor output.
The filter elements are as follows: 13k resistor, 100nF ceramic cap giving me a cutoff frequency of 122.4Hz which should be fine, as anything useful is in frequencies lower than that.
Any ideas why I am getting even more noise after applying this low pass filter, and noise on the power supply in addition, I must be doing something really stupid. Would an active filter get rid of some of these problems?
Regards