surreyian
Member level 3
Hello
There are 3 gm equations that can be used
1/ gm=2Id/Vgs-Vth
2/ gm= sqrt(2k(W/L)Id)
3/ gm= k(W/L)(Vgs-Vth)
when do u know which equations to use to determine the gm?
Equation 1, if u have Id constant, gm will decrease with increasing vgs-vth. I can connect a common source with ideal current, increasing vgs will cause gm to decrease. Is that right?
Equation 3. what kind of circuits will use equation 3 to determine the gm. can u give me an example.
thanks
There are 3 gm equations that can be used
1/ gm=2Id/Vgs-Vth
2/ gm= sqrt(2k(W/L)Id)
3/ gm= k(W/L)(Vgs-Vth)
when do u know which equations to use to determine the gm?
Equation 1, if u have Id constant, gm will decrease with increasing vgs-vth. I can connect a common source with ideal current, increasing vgs will cause gm to decrease. Is that right?
Equation 3. what kind of circuits will use equation 3 to determine the gm. can u give me an example.
thanks