Pwm Am Transmitter Schematic Class D. Depending on the ht available to the switching regulator this class d transmitter offers continuously variable rf carrier power from zero to over 100 watts via the duty cycle control in the switching regulator. First the point of practical implementation is a block design with the necessary description of the basic radio interface communication.
A wide variety of microcontroller applications exist that need analog output but do not require high resolution d a converters. I have chosen the class d design as opposed to the more efficient class e because it has a very wide bandwidth. A pwm modulated 100w current mode class d cmcd am mw transmitter running over 530w peak 40v arf488b mosfets driven by two tc4452 drivers dds signal source pwm modulator with two irfp250n driven by a ir2110 running at 150khz 4 th order lpf for the pwm frequency a diplexer output filter.
A wide variety of microcontroller applications exist that need analog output but do not require high resolution d a converters.
Here s the rf class d pa section. Am transmitter dds pwm pdm class d power 4kw medium wave hf amplifier linear broadcast am modulation all tests have been done and new vd will upload soon. The pwm fully modulates the carrier across this full rf power range. Power supply is 110v dc.
