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why AC load line is more steeper than DC load line?

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electronics_kumar

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ac load line

In operating point analysis,why AC load line is more steeper than DC load line?
 

VVV

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ac load line analysis

That is because the next stage or the load is generally AC (capacitively) coupled. That means that the DC analysis only takes in consideration the impedance directly connected to the active device.
However, in AC the input impedance of the next stage or of the load appears in parallel with it so the resulting impedance is lower, making for a steeper load line.
 

Eric Best

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which is more steeper ac or dc loadline

VVV said:
That is because the next stage or the load is generally AC (capacitively) coupled. That means that the DC analysis only takes in consideration the impedance directly connected to the active device.
However, in AC the input impedance of the next stage or of the load appears in parallel with it so the resulting impedance is lower, making for a steeper load line.

You are right but to be more precise, then in the sentence "That means that the DC analysis only takes in consideration the impedance directly connected to the active device." you should have used the resistance (even if a resistance is generally also an impedance).

Best Regards
Eric
 

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