Prediction of Gain Expansion and Intermodulation Performance of Nonlinear Amplifiers

다국어 초록 (Multilingual Abstract)

A mathematical model for the input-output
characteristic of an amplifier exhibiting gain expansion
and weak and strong nonlinearities is presented. The
model, basically a Fourier-series function, can yield closedform
series expressions for the amplitudes of the output
components resulting from multisinusoidal input signals
to the amplifier. The special case of an equal-amplitude
two-tone input signal is considered in detail. The results
show that unless the input signal can drive the amplifier
into its nonlinear region, no gain expansion or minimum
intermodulation performance can be achieved. For
sufficiently large input amplitudes that can drive the
amplifier into its nonlinear region, gain expansion and
minimum intermodulation performance can be achieved.
The input amplitudes at which these phenomena are
observed are strongly dependent on the amplifier
characteristics.

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