
88 AMPLIFIERS
Figure 4.21 Single-stage class C
radio frequency power amplifier
Figure 4.22 Adding series
resistance to the input of an
amplifier in order to raise the
effective input impedance
+ 9 V
Input
Output
OOV
Figure 4.23 Simple emitter
follower stage
«—ID
150 k
1
TRj
BC184L
7
-+ 9 V
Input
R
2
100 k
10μ
-M-°
Output
Figure 4.24 Alternative emitter
follower stage
-oov
maximum output. There is some interaction between the three adjustable
components and thus the procedure should be repeated several times for
optimum results. The output of the circuit is reasonably pure but, where
the signal is to be radiated, it should be applied to a multistag ...