Problem ＃1 The op amp in the circuit is ideal. a) Calculate vo if va = 4V and vb = 0V. b) Calculate vo if va = 2V and vb = 0V. c) Calculate vo if va = 2V and vb = 1V. d) Calculate vo if va = 1V and vb = 2V. e) Calculate vo if va = 1.5V and vb = 4V. f) If vb = 1.6 V, specify the range of va such that the amplifier does not saturate.

Solution:

 

Problem #2 a) The op amp in the circuit shown is ideal. The adjustable resistor RΔ has a

maximum value of 100 kΩ, and α is restricted to the range of 0.2 < α < 1. Calculate the range of vo if vg = 40 mV.

b) If α is not restricted, at what value of α will the op amp saturate?

 

Solution:

Problem #3  Design an inverting-summing amplifier so that vo = -(3 va + 5 vb + 4 vc + 2 vd). Start by choosing a feedback resistor (Rf) from Appendix H. Then choose single resistors from Appendix H or construct resistor networks from resistors in Appendix H to satisfy the design values for Ra, Rb, Rc, and Rd. Draw your final circuit diagram.

Solution:

 

 

Problem #4 The op amp in the circuit is ideal. a) What op amp circuit configuration is this? b) Calculate vo.

Solution:

Problem #5 The op amp in the circuit is ideal. What value of Rf will give the equation vo = 5 - 4va, for this circuit?

Solution: