The following circuits have different feedback.
Resistor \$R_F\$ senses the output voltage and returns a proportional current to node \$V_X\$. Thus, the feedback can be considered as the voltage-current type.
The circuit consists of two common-source stages, with RF and RS sensing the output voltage and returning a fraction thereof to the source of \$M_1\$.
The feedback network includes \$R_1\$, \$R_2\$, and the transistor \$M_1\$.
What type is this ? is this voltage to voltage feedback?
How about the 5th one with BJT?
How can you tell what kind of feedback it is?