the problem in the frequency domain, the overall system transfer function (TF) is
the product of the transfer functions of all of the components. Since they all
typically decay with increasing frequency, the system TF will be narrower than
any component TF. The result of all this is that we might assemble a system with
components, each of which has adequate resolution, only to find that the system
itself does not. Searching for a single offending component will be futile, since this
chain is weaker than any of its links. Thus we must select components based on
overall, not individual, performance requirements.
3.8.2 Design Rules of Thumb
Here we discuss some principles that can be used to guide the design of a system,
even when this consists mainly