chen_Analog
Newbie level 6
large signal gain
what is the main difference between large signal gain and small signal gain
what is the main difference between large signal gain and small signal gain
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elbadry said:In the small signal gain calculations, you assume that the input signal is small enough so that it doesn't change the dc operating point of the device ( hence you assume a constant gm, ro..etc ), i.e. the circuit is linearized around the dc operating model ( a linear model is used to calculate the gain )
In large signal, the signal causes changes in the operating point. So, linearizing the circuit around the dc operating point would yield wrong results. In this case, a full non-linear model of the circuit has to be used.
chen_Analog said:So in spice simulation, when doing AC analysis, the small signal model of the device is employed, but when doing Tran analysis, the large signal model is employed, isn't it?