In the figure below, Find the gain (including sign) and the input impedance if:
ID: 1282453 • Letter: I
Question
In the figure below, Find the gain (including sign) and the input impedance if:
(It may be hard to read from the picture but the two resistors are 5 kilo-ohms and 25 kilo-ohms, and the top input is inverting and the bottom input is non-inverting.)
In the figure below, Find the gain (including sign) and the input impedance if: A is input and B is grounded A is grounded and B is input (It may be hard to read from the picture but the two resistors are 5 kilo-ohms and 25 kilo-ohms, and the top input is inverting and the bottom input is non-inverting.)Explanation / Answer
When A is input
At node (-) equation=> (Va -0)/5Kohm = (0-Vo)/25KOHM
so Gain = Vo/ Va = -5;
input current = Ia = (Va-0) / 5kohm
so input impedance = Va/Ia =5Kohm;
When input at B
node equation at (-) => (0-Vb)/5kohm = (Vb-Vo)/25kohm
so Gain = Vo/Vb = 6;
current at Input B => Ib =0;
so input impedance =Vb/Ib = infinity;