Hey guys,
I wanted to know a bit more on RC Phase Shift Oscillators when I came across this website.. :
http://www.aikenamps.com/PhaseShiftOscillators.html
Under the " How do they work? " section , there is a sentence that reads as follows :
"In order to create and sustain an oscillation at a particular frequency, a circuit must have a gain higher than unity, and a total phase shift around the loop of 360 degrees (which is equivalent to 0 degrees, or positive feedback). "
I don't quite see why we need a gain higher than unity and a total phase shift of 360 degrees... could someone elaborate and explain that sentence ? ( probably an explanation on positive feedback and how it results in oscillations)
Thanks Guys..
I wanted to know a bit more on RC Phase Shift Oscillators when I came across this website.. :
http://www.aikenamps.com/PhaseShiftOscillators.html
Under the " How do they work? " section , there is a sentence that reads as follows :
"In order to create and sustain an oscillation at a particular frequency, a circuit must have a gain higher than unity, and a total phase shift around the loop of 360 degrees (which is equivalent to 0 degrees, or positive feedback). "
I don't quite see why we need a gain higher than unity and a total phase shift of 360 degrees... could someone elaborate and explain that sentence ? ( probably an explanation on positive feedback and how it results in oscillations)
Thanks Guys..