TC 9-62
Figure 5-10. Impedance-coupled Transistor Amplifier
Transformer Coupling
5-50. Figure 5-11 shows a transformer-coupling network between two stages of
amplification. The transformer action of T1 couples the signal from the first stage to the
second stage. The primary of T1 acts as the load for the first stage (Q1) and the secondary
of T1 acts the developing impedance for the second stage (Q2). No capacitor is needed
because transformer action couples the signal between the primary and secondary of T1.
5-51. The inductors that make up the primary and secondary of the transformer have
very little DC resistance, so the efficiency of the amplifiers very high. Transformer
coupling is very often used for the final output (between the final amplifier stage and the
output device) because of the impedance-matching qualities of the transformer. The
frequency response transformer-coupled amplifiers are limited by the inductive reactance
of the transformer just as it was limited in impedance coupling.
Figure 5-11. Transformer-coupled Transistor Amplifier
5-12
TC 9-62
23 June 2005
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