By G.J. Pridham and N. Hiller (Auth.)
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Extra info for Electronic Devices and Circuits
28. Variation of Ζ and / for Fig. 27. F I G . 29. Parallel RC circuit. 35 NETWORK THEORY As in the case of inductive circuits, it is important to realize the difference in sign between capacitive reactance and susceptance. A capacitive reactance is represented by —jXc while a capacitive susceptance is represented by +jBc; F I G . 30. Variation of y and / for Fig. 29. also the admittance = G + 2 jBc = V ( G + Be) ^ t a n - 1 ^ . G The admittance variation is shown in Fig. 30 and the current frequency relation follows the same pattern.
44 ELECTRONIC DEVICES AND CIRCUITS The above definition of Q applies t o b o t h the circuits considered since the same current flows through the resistance a n d the inductance. 12. Coupled Circuits When two closed circuits have a common impedance, they are said t o be coupled by that impedance. One of the commonest forms of coupling is by mutual inductance. The power transformer, when OUT F I G . 37. Mutually coupled circuits. virtually all the flux produced by the primary coil links with the secondary circuit, is a well-known example of this.
50 the response curve will be as shown in Fig. 51. The output voltage will have a maximum value at the resonant frequency f0 and fall to VmKKl^j2 at frequencies fx and f2. The bandwidth is then fx — f2 and is obviously related to the Q NETWORK THEORY 59 factor of the circuit. It m a y be shown (see Volume 2) that this bandwidth is / 0 / ß . The figure of 3 d b is related to the ability of the h u m a n ear t o differentiate between sounds of different intensity. A 2 : 1 power ratio is just distinguishable by the average person a n d hence if the overall response of a system is within 3 d b there is n o loss in reproduction.