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P. 203
Amplifier Design
202 Chapter Three
Figure 3.107 Paralleled MMIC amplifiers with a splitter and a combiner.
50
1. L
1.4 f
1
2. C
2.83 f50
3. C 2C
2
4. R 2Z 100 ohms
PORT
5. Make impedance X of C less than or equal to 1 ohm.
C C
3.7 Audio Amplifiers
3.7.1 Introduction
Many nonpower audio amplifier stages need not be matched to their source
nor to their load. Since matching is used to maximize power transfer between
stages and to reduce standing waves, audio amplifiers are much more con-
cerned with reducing distortions and isolating each stage from the effects of
the next. However, matching with low-frequency transformers is quite com-
mon with discrete audio power stages in order to obtain high efficiencies, while
RC matching is also employed in audio voltage amplifiers. An acceptable sin-
gle-stage audio voltage amplifier can be designed by using the low frequency
bias design formulas as presented in Sec. 3.3, “Amplifier Biasing.”
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