Edit: I have updated the question with the marked answer
Follow up question to my question from two days ago:
How to calculate this resistor MOSFET circuit?
These are the tasks:
Choose \$R_D\$ and \$R_2\$ that if a current of \$50mA\$ flows through \$R_D\$, and \$U_{GS}\$ and \$U_{DS}\$ are \$6V\$
Calculate \$I_{D,max}\$ and \$U_{D,max}\$ and chart the characteristic into Figure 6
Mark the operating point in Figure 6 in which region is it ? What has to be done to shift the operating point into the linear region?
Calculate the factor \$\beta\$ if \$U_{th}\$ equals \$1V\$
Calculate the draincurrent with the factor \$\beta\$ and the values: \$U_{GS}= 7V\$ and \$U_{DS}=2V\$ and mark the operating point in the characteristic in Figure 6
This is the circuit:
This is the characteristic (Figure 6):
There are the given values:
\$U_B\$ is \$12V\$
\$R_1\$ is \$100k\Omega\$
Here are my solutions/thoughts
I have calculated that \$R_2\$ has to be \$100k\Omega\$. But this is already where am not sure what is correct. I have been told (here, full disclosure) that \$U_{GS}\$ and \$U_{DS}\$ will always be equal in this circuit and in the case of \$6V\$ \$R_D\$ has to be \$120\Omega\$. I have mixed feelings about this, since I myself calculated \$240\Omega\$ and in the question earlier have been told that even \$240k\Omega\$ is correct.
Then to mark the characteristic, I would have marked either \$12V\$ or \$6V\$ and \$100mA\$ or \$50mA\$, why \$100mA\$ the task later asks, how to get the operating point into the ohmic region again, almost implying that I is in the saturation region initially. In this instance only \$100mA\$ and \$12V\$ would make sense, because thats the only instance the operating point is in the saturation area. I am confused.
Then in the next task, calculating \$\beta\$ should be no trouble, since I know all the variables, and only have to solve for \$\beta\$, but I need the correct operating point to be able to solve it.
Then in the last task, which I haven't done aswell yet, my solving way should be to simply solve for \$I_D\$ with the factor \$\beta\$ from the task earlier since I have all the variables.
Marked Solution:
If translation is nessecary please comment below