Phase Difference of Transfer Function H(jw)

[nicktacik]

Homework Statement

If I have a transfer function $$H(jw)= |\frac{V_o}{V_i}|$$. I need to find the phase difference between Vo and Vi.

Homework Equations

The Attempt at a Solution

The phase angle is $$tan^{-1}(\frac{Im(H)}{Re(H)})$$. My problem is that if I get a positive angle, does this mean that the Output leads or lags the input? I can't find this explained clearly in any text.

 

[learningphysics]

A positive phase difference is a lead. A negative phase difference is a lag.

 

[learningphysics]

The Attempt at a Solution

The phase angle is $$tan^{-1}(\frac{Im(H)}{Re(H)})$$. My problem is that if I get a positive angle, does this mean that the Output leads or lags the input? I can't find this explained clearly in any text.

Leads.

 

[nicktacik]

Thanks.