A system and method of amplitude modulation is described in which first and
second 180 degrees out-of-phase signals are produced and are each
amplified by one of two (different amplification factor) non-linear
amplifiers. One of the signals is amplified using constant amplification
by a first non-linear amplifier to generate a relatively small amplified
signal. The other of the signals is modulated using variable amplification
by a second non-linear amplifier to generate a relatively larger amplitude
modulated signal. The two resulting 180 degree out-of-phase signals are
combined, such that the smaller signal effectively cancels out lower level
distortion exhibited by the larger amplitude modulated signal.
Alternatively, a symmetrical structure can be used for generating AM
signals which include phase reversals of the carrier.
