By B. W. Allen (auth.)
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Extra resources for Analogue Electronics for Higher Studies
The use of transformers for inter-stage coupling also allows the circuit designer to match the output impedance of one stage to the input of the next. This method provides a high degree of impedance matching and , in tum, a high level of power transfer occurs. 2. 2 Transformer-coupled amplifiers The arrangement shown is perfectly valid, with maximum power transfer achieved by matching the impedance of the winding to its appropriate circuit. However, in many miniature circuits, the capacitor is a very small, fixed-value component and tuning is achieved by means of one or two variable-position cores in the transformer.
At 45 0 each side of V3 (mid band) would be the -3 dB frequencies, f) and f2. Note: If an amplifier employed direct coupling then all frequencies from d,c, to mid band would be at a phase angle of 1800 and the locus Ofv3 would be the high band semi-circle only. Later in this book phasor 47 2. Cascaded Amplifiers plots will be employed to determine the stability, or otherwise, of multi-stage amplifiers with feedback applied to them. high band / -' / --~~ " -"",, ,, .......... , ,, " ~" "- \',, ~ ..........
5 Directly-coupled amplifier response Note: These signals could not be amplified by a transformer-coupled or an R-C coupled amplifier because the d,c. content ofthe signal would be blocked by the coupling components. The excellent low frequency response of directly-coupled amplifiers leads to their extensive use in high quality audio amplifiers. c. signals means that they are to be found in many instrument amplifiers. A disadvantage of the direct coupling method is that of component drift. If a transistor becomes warm and, as a result , its biasing arrangement changes , that change will appear at the input of the next stage and will be amplified along with any required signal.