A DIGITAL AMPLITUDE MODULATION TRANSMITTER WITH PULSE WIDTH MODULATING RF DRIVE

摘要

A digital amplitude modulation (AM) transmitter with pulse width modulating RFdrive is presented. A plurality of RF amplifiers, each, when turned on,amplifies an applied RF drive signal by the same amount to provide a unit stepRF output. An encoder supplies turn-on signals to turn on a number of the RFamplifiers wherein the number varies as a function of the value of an appliedaudio signal. The width of the unit step RF output is varied as a function ofthe number of the RF amplifiers that are turned on.