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发表于 2012-6-21 11:18:02
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For example, Use 24bits DAC, But layout must be very very careful, the impendance match is required. Besides, zero offset OPAs are used for DAC and ADC.
Then, get the digital outputs of ADC, FFT, check noise floor. if over -90 dB, you get it.
Or
Connect to very clear ground by dirctly or 50Ohm. Then check noise floor by FFT. |
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