500 Network Analysis and Synthesis
A network function is tested first for its realisability. It is then tested for its stability. After
that, we proceed to realize the network using Foster and Cauer methods.
In this chapter, we will examine the network function for their stability condition. We will
also explain the process of realisation of the network, when the driving point network function
is given.
12.2 HURWITZ CONDITIONS FOR STABILITY
The driving point impedance or admittance is expressed as the ratio of two polynomials, P(s)
and Q(s). These polynomials are tested for Hurwitz stability conditions. If they satisfy the con-
ditions, then we say that they are Hurwitz.
Consider a polynomial:
Ps as as as as a
nn n
()=+ ++…+ +
nn n1
1
2
2
Then, for ...