Behzad Razavi in his book mentions "It is important to bear in mind that small signal analysis deals with only (small) changes in voltages and currents around their quiescent values.... If the signal perturbs the bias point of the device only negligibly, we say the circuit operates in the small signal regime. So the change in Icq due to the signal must remain small".
It is important to bear in mind that small signal analysis deals with only (small) changes in voltages and currents around their quiescent values.... If the signal perturbs the bias point of the device only negligibly, we say the circuit operates in the small signal regime. So the change in Icq due to the signal must remain small.
However when we study about maximum symmetrical swing we look to bias it by the middle of the ac load line.. So the if the collector bias current is Icq then the maximum swing too is Icq. But.. How then is the change in Icq, small, due to application of signal????? How do we specify the small signal regime of operation?
