How can I bring the equivalent block diagrams shown in the lab manual to a form similar to that shown in the course notes?
Let’s consider the closed-loop case. Consider the closed-loop equivalent block diagram from the lab manual. For the forward path, applying the same reasoning as in the open-loop case, the negation introduced by the summer and the negation introduced by the gain cancel out. On the feedback path, H(s)= -1 is an inverter necessary for feeding into the summing node a negative feedback. The following simplified closed-loop diagram results. Similar simplifications can be applied to the systems analyzed in Project 1 and Project 2.
