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EVB AD+designed dac+analog LPF

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surno

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Hi, everyone.

Today I tested DAC chip that is designed DAC. I composed evaluation board ADC, designed DAC and low pass filter with 20MHz bandwidth because of reject high frequency noise.

The test result,, output waveform is good but SFDR is bad. I want to improve SFDR factor. How can I improve SFDR factor by changing a LPF?
 

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