Question

1. Circuit 1: Find the output voltage Vo, output current lo,and closed loop gain G = 4 for the op-amp circuit below, assuming the op-amp is ideal. Show all your work, use only KCL and the ideal assumptions to find the output voltage. Let Vs = 1V, R1 = 80K, R2 =20K and RL = 1K. Power supply voltages are +Vcc = 15V and -Vcc = -15V. Hint: To find l,first find Vo, and then perform KCL at V, to find the current in each branch at that node.

Fig: 1

Fig: 2