Question of phase plot init point (180 vs 0 deg)

[freescale_bharat]

phase plot

I have seen that sometimes phase plot starts at 180 deg and progresses towards 0 deg OR it starts at 0 deg and goes towards -180 deg.

Can anyone explain the reason.

Thanks

 

[biff44]

Re: Question of phase plot

Could you be more nebulous? Phase plot of what?

 

[LvW]

Re: Question of phase plot

I have seen that sometimes phase plot starts at 180 deg and progresses towards 0 deg OR it starts at 0 deg and goes towards -180 deg.
Can anyone explain the reason.

Thanks

The explanation of the reason for different phase functions is very simple:
In both cases the circuitry is different. (But I am not sure if you are satisfied now; but that´s the only answer one can give to the above question).

 

[edge_tv]

Question of phase plot

I would say, if the phase sarts with +180 deg you see an inverting Amp. If it starts with 0 deg you see an non inverting Amp.

 

[cdbular]

Question of phase plot

it depends which input you take as reference. As edge_tv said, when the phase starts at +180 is because you are using the inverting input as reference for the AC analysis.