ac ground in MOSFET small signal models

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mosfet ground

Hi,
In MOSFET small signal models, analysis are being carried out when Substrate, gate and drain are at ac ground. Though I could able to understand what dc ground is, ac ground seems to be puzzling.

Will highly appreciate if analog veterans can throw some light on this.

Thanks in advance,
Giri
 

mosfet small signal analysis

A DC ground, of course, can be also an AC ground. Apart from that any node that doesn't carry an ac signal and only has a DC value is considered at AC ground. For example, VDD is AC ground.
 
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