ABSTRACT
In Section 1.2, we used the ideal feedback model to study the properties of feedback amplifiers. The model is useful only if we can separate a feedback amplifier into the basic amplifierm(s) and the feedback networkb(s). The procedure is difficult and sometimes virtually impossible, because the forward path may not be strictly unilateral, the feedback path is usually bilateral, and the input and output coupling networks are often complicated. Thus, the ideal feedbackmodel is not an adequate representation of a practical amplifier. In the remainder of this section, we shall develop Bode’s feedback theory, which is applicable to the general network configuration and avoids the necessity of identifying the transfer functions m(s) and b(s).
