The Maplin Electronic Circuits Handbook, 2nd Edition

84 AMPLIFIERS

+ 9 V

Figure 4.12 Wideband single-

stage common-emitter amplifier

Input

Output

L,

too large

L,

optimum value

Figure 4.13 Frequency response '

of the amplifier in Figure 4.12

Frequency

frequency response it must not be too large. It must equally well not be

made too small or it will be ineffective in extending the frequency response.

The effect of the peaking inductor is shown in Figure 4.13.

The value of the inductor can only be calculated precisely where the

equivalent value of shunt capacitive reactance is known. In practice,

however, values of between 22 μΗ and 220 μΗ make a good starting point

for experimentation.

The best