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用一个增强型的MOS场效应管对AD9850 进行电压控制或对
消耗积分:10 |
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大小:34 |
2009-06-06
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This application note will offer a method to voltage control
or amplitude modulate the output current of the
AD9850 DDS using an enhancement mode MOSFET to
replace the fixed RSET resistor; and a broadband RF
transformer to combine the DDS DAC outputs to produce
a symmetrical AM modulation envelope. Modulation
with reasonable linearity is possible at rates
exceeding 50 kHz. The AD9850 DDS output current
(20 mA maximum) is normally set with a fixed resistor
from the RSET (Pin 12) input to ground. The DAC outputs
are unipolar and complementary (180 degrees out of
phase) of each other.
or amplitude modulate the output current of the
AD9850 DDS using an enhancement mode MOSFET to
replace the fixed RSET resistor; and a broadband RF
transformer to combine the DDS DAC outputs to produce
a symmetrical AM modulation envelope. Modulation
with reasonable linearity is possible at rates
exceeding 50 kHz. The AD9850 DDS output current
(20 mA maximum) is normally set with a fixed resistor
from the RSET (Pin 12) input to ground. The DAC outputs
are unipolar and complementary (180 degrees out of
phase) of each other.
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