kieran.french
New Member
Hey,
I was wondering if anyone out there can help me with a problem im having with 'ringing' on a comparator output. As the output changes from logic level '0' to logic level '1' there is a short burst of oscillations on the output. This is really undesirable as the comparator output is used as an input to a quadrature waveform generation circuit that ultimately inputs encoded signals to a digital tachometer. The ringing on the comparator output causes spikes to occur on the velocity profile of the digital tach.
At the moment I am using positive feedback on a LM311N comparator. The positive feedback has reduced the ringing considerably but it is still affecting the velocity profile on the digital tachometer.
If anyone has any idea how to get rid of the comparator ringing entirely I would be extremely grateful as this is all part of a final year undergrad electronics degree project and is due for assessment in 4 weeks.
Thanks,
Kieran.
I was wondering if anyone out there can help me with a problem im having with 'ringing' on a comparator output. As the output changes from logic level '0' to logic level '1' there is a short burst of oscillations on the output. This is really undesirable as the comparator output is used as an input to a quadrature waveform generation circuit that ultimately inputs encoded signals to a digital tachometer. The ringing on the comparator output causes spikes to occur on the velocity profile of the digital tach.
At the moment I am using positive feedback on a LM311N comparator. The positive feedback has reduced the ringing considerably but it is still affecting the velocity profile on the digital tachometer.
If anyone has any idea how to get rid of the comparator ringing entirely I would be extremely grateful as this is all part of a final year undergrad electronics degree project and is due for assessment in 4 weeks.
Thanks,
Kieran.