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Using two AD8369 amps in series?

Question asked by H.Byrd on Mar 19, 2013
Latest reply on Apr 3, 2013 by stevereine

Hi

 

I'm amplifying a pulsed 10.7 MHz IF signal, the pulse width is 600 nSec with a PRF of 2.5 kHz. After amplification, I'm using an AD8310 logamp and an AD8561 comparator to detect and amplify the pulse.  To increase the sensitivity, I'd like to use two AD8369 digital controlled VGAs in series, controlled with an ATMEL SAM3 ARM. The AD8369 spec sheet, under INPUT STAGE, states that the Maximum Linear Input at minimum gain is 2.2V, but I'm not exactly sure of what that means. 1) Is it feasible to use the amps in series? And 2) If so, what precautions do I need to observe?

 

Thank you

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