Square wave approximation http://www.peterstone.name/Maplepgs/fourier.html Q-factor http://en.wikipedia.org/wiki/Q_factor Q값이 클수록 오실레이션이 오래지속된다 TL072 J-FET Op Amp http://focus.ti.com/general/docs/lit/getliterature.tsp?genericPartNumber=tl072&fileType=pdf |


