Page 207 - Build Your Own Transistor Radios a Hobbyists Guide to High-Performance and Low-Powered Radio Circuits

FIGURE 13-7 Example of gain or transconductance com ,pression.
Thexaxisis the input, and the >axis is the output.
So let's take a look at how the large-signal transconductance Gm is different from
the small-signal transconductance gm measured in amperes per volt for a DC
collector current of 1 mA = ICQ for various sine-wave a1mplitudes measured at a

peak voltage Vp or as a function of sin(w" into the base-emitter junction of the
transistor (Table 13-2). And the output collector current is the amplitude of the
signal current at only the fundamental frequency. Note that ICQ is the quiescent

(DC) collector current.
TABLE 13-2 Comparisons of Large and Small Signal Transconductances as a
Function of Base-Emitter Peak Sine Wave Driving Voltages