1. For the inverting, summing amplifier shown, find the voltage gain relationship (i.e., relationship between output v_o and inputs v_a, v_b). 
 
 
 
 
 
  
 
 
 
 
 

2. For the circuit of figure 3 in the lab:

  a) Find the input impedance to the right of V₁.  




 b)  What is the output impedance of the amplifier circuit?

3. For the circuit of figure 4 in the lab:
  a) What is the voltage gain of this circuit?
 
 
 
 
 
b) What is the input impedance of this circuit?



c)  What is its output impedance of this circuit?