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Direct Digital Synthesis (DDS)

Q&A AD9834 + AD8014 DC return resistor

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AD9834 + AD8014 DC return resistor

gt5659a on Jun 24, 2020

I have an AC-coupled signal coming from an AD9834 fed into an AD8014 as shown below.

Do I need a DC return resistor to ground between C11 and U7 and, if so, what value should I use?

My maximum output frequency will be 5 MHz, sine wave only.

Thanks for helping out this ME :)

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languer Jun 24, 2020 +1 verified

Your amplifier is already bipolar so I see no reason you would need a resistor to GND at its input. Do remember that both Iout and IoutB should have a reference resistor to Gnd (I see R24 for IoutB, but…

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+1 languer on Jun 24, 2020 8:06 PM

Your amplifier is already bipolar so I see no reason you would need a resistor to GND at its input. Do remember that both Iout and IoutB should have a reference resistor to Gnd (I see R24 for IoutB, but not sure if you have one for Iout which you are not showing).
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+1 languer on Jun 24, 2020 8:06 PM

Your amplifier is already bipolar so I see no reason you would need a resistor to GND at its input. Do remember that both Iout and IoutB should have a reference resistor to Gnd (I see R24 for IoutB, but not sure if you have one for Iout which you are not showing).
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