
99Signal Design
changes. When any design change is made, it is good practice to understand what adverse effects the
change may have and to develop a regression test to verify that the adverse effect did, or did not, occur.
The concept of regression testing is normally used in a software context. In this chapter, the con-
cept is expanded to include hardware and software. Once all of the data on the device performance
are collected, a design review will need to be performed and documented.
Assuming there are aspects of the device that do not conform to requirements, then the device
will need to be changed. Exactly how the device is changed is up ...