A Theoretical Comparison of Coupled Amplifiers with Staggered Circuits

Detuned or staggered single tuned circuits are compared theoretically with the so-called band-pass or coupled circuits. The networks in each case are compared with each other by expressing the ratio of the input to output voltage in terms of the amplifications, A0of a single tuned stage. It is shown that approximately the same results are obtained up to optimum coupling by either method. If very broad curves are desired coupled circuits give more amplification than staggered circuits. Resonance curves for each case are calculated. Some experimentally determined selectivity curves are given for staggered stages. These curve slopes bear out the theory given. Methods of obtaining the required detuning are discussed.