ADC (AD9051)Front end design

Question

Hello , 
 I use log detector (like AD8318) for pulse detection application. Applying detector output to ADC and which is sampled at 20MSPS and use this samples for further processing. 
 I use ADC part AD9051 in single ended ,DC coupled mode as shown below. 
 
 Problem here is output of AD9631 is inverted compared to Vin (with DC shift )and hence I need to use one more inverting amp to make ADC input compatible with Vin. 
 Please suggest simple solution for problem? 
 Thanks / 
 Shamanth

ADIApproved · Accepted Answer

Hi Shamanth, 
 I discussed your inquiry with the AD9631 support team and the general consensus is that in order to maintain polarity unity with your system input you will either need to invert your signal with an additional unity gain amplifier stage before it goes into the AD9361, or digitally invert the output polarity post-conversion from the ADC within your receiver logic/FPGA. 
 Best Regards, 
 TonyM

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ADC (AD9051)Front end design