Hi Manu, Just because you have a PWM signals with an 11 bit resolution does not mean that there are more than 100 thousand pulses per second. If I were working on your circuit, I would want to visualize (on the scope), what the overall shape of each PWM pulse is: is there unexpected ringing? What do the rising and falling edges look like? A 100MHz scope will surely see individual 100kHz PWM pulses in great detail. Sean On Sat, Nov 10, 2012 at 11:35 AM, Manu Abraham wro= te: > Hi Sean, > > Even with a scope with a 100MHz bandwidth: > > with a > PWM freq=3D100kHz > Signal=3D50Hz > PWM resolution=3D11bits > > > and with a sine table of 2048 PWM period entries per cycle of the > modulated signal, there are simply too many pulses to be seen > on a scope's screen. If you try to lower the measuring period, > then you won't be able to see any pulses, but just voltage averages, > which is not any different from what you see in the screencaps, > posted earlier. > > I wonder how you propose to make out the details, using a scope > with a higher bandwidth. > > Or am I missing something ? > > Regards, > Manu > > > > On Sat, Nov 10, 2012 at 8:51 PM, Sean Breheny wrote: >> Hi Manu, >> >> I really think that you need a faster scope, with at least a few MHz >> bandwidth, so you can see what is actually happening during each PWM >> cycle. There are many possible issues going on here which require you >> to see each cycle, not just the 50Hz-range "average" behavior. >> >> Sean >> >> >> On Sat, Nov 10, 2012 at 4:37 AM, Manu Abraham w= rote: >>> Hi, >>> >>> Yes, I follow what you meant by that the IR2110 is not an analog compon= ent >>> but a device that drives a MOSFET in either Cutoff or Saturation region= s, >>> which is what I am using it for. >>> >> -- >> http://www.piclist.com PIC/SX FAQ & list archive >> View/change your membership options at >> http://mailman.mit.edu/mailman/listinfo/piclist > -- > http://www.piclist.com PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .