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AD8345/6/9 (+simple DAC) acting as phase shifter

Question asked by michelebavaro on Nov 28, 2014
Latest reply on Dec 5, 2014 by michele

Ispired by a relatively old paper titled

 

"Low Cost Electronically Steered Antenna and Receiver System for Mobile Satellite Communications"

 

and attached, I was wondering if it would be possible to use the AD8346 as phase shifter for GPS.

The part originally used was a HPMX-2001 and the LO 0/90 were fed with an active GPS antenna feed (25dB gain and 2dB noise figure) passing through a 90 deg coupler.

Obviously the datasheet states that a LO drive of -10dB is optimal for these quadrature modulators.. but I was wondering what would happen if I would connect a "noise like" at roundabout -100dBm

I hope this intrigues someone wiser than me!

 

Bests,

Michele

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