AnsweredAssumed Answered

DC-Coupled AD8310

Question asked by mtapalla on May 4, 2011
Latest reply on Aug 3, 2011 by bsam

Hello,

 

I want to use the AD8310 with a DC-coupled  input. I am using the setup from the datasheet in Figure 38 (page 19)  reproduced here:

1.bmp

 

However, I have an extremely poor dynamic range. The   dynamic range of this circuit is advertised through Figure 39 (page 19)   of the datasheet, which is reproduced below:

2.bmp

I  am not getting this dynamic range no matter what I adjust the   potentiometer to. The lower end of the range is limited at an input of   about -30 dBm.

 

Any ideas how I could troubleshoot this?

 

If it helps, if I use the basic AC-coupled configuration (show below), I DO indeed achieve the advertised dynamic range.

3.bmp

Thank you for your time!

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