This application note will offer a method to voltage controlor amplitude modulate the output current of theAD9850 DDS using an enhancement mode MOSFET toreplace the fixed RSET resistor; and a broadband RFtransformer to combine the DDS DAC outputs to producea symmetrical AM modulation envelope. Modulationwith reasonable linearity is possible at ratesexceeding 50 kHz. The AD9850 DDS output current(20 mA maximum) is normally set with a fixed resistorfrom the RSET (Pin 12) input to ground. The DAC outputsare unipolar and complementary (180 degrees out ofphase) of each other.
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