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how much dynamic range of  input signal can be measured by AD6645

Question asked by cj@ on Apr 16, 2012
Latest reply on Apr 19, 2012 by TomMac

if the spurious is not counted(because the frequency of the input signal is known),how much dynamic range can be measured by AD6645.

the frequency of input is 3MHz,sample frequency is 90MHz.

 

after sample ,follow the process:

downsample to 10MHz;

do 65536 point fft;

question :

whether the input singal which amplitude is -100dBm(less than 1lsb) can be measured or not? why ?   

 

i have done experiment on one ADC evaluation board(16 bit adc). all the signal from 10dBm to -110dBm can be measured.

10-90.JPG

110.JPG

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