IF sampling frequencies vs FPBW

Question

On the first page of AD9265 datasheet, it mentions that "IF sampling frequencies to 300 MHz" and "Differential analog inputs with 650 MHz bandwidth&rdquo;. I think 650MHz is the 3dB full power BW, then we can input analog signal up to 650MHz. Right? How to understand " IF sampling frequencies to 300 MHz"? What's its meaning?

PMH · Accepted Answer

Hello, 
 Your understanding of the BW is correct and one could inject signals up to (and beyond) 650 MHz if the loss (3dB+) and performance degradation is considered acceptable for the application. IF sampling is subjective since their are many RF bands situated below 300 MHz also. That said..........many of the communication applications that may have used this device were high performance radio applications based on superhet architecture where the ADC would sample the IF signal following the mixer (after amplification and filtering).

IF sampling frequencies vs FPBW

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