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LT5537 Vout starts at 0.9 V

Category: Software
Product Number: LT5537

Dear all,

I created a simple circuit like shown in the LT5537‘s datasheet just without the R1 and C6 from figure 13.

I tested two different LT5537 without any RF input and nothing connected to the output. I even grounded both input pins. The Vout stays at about 0.9 V. I tried it with the simple input circuit from figure 13 and with the matching network. 

Disabling the LT5537 does only slightly reduce Vout.

Why is my initial Vout that high? It should be around 0.4 to 0.5 V right?

Maybe this is also the problem why I‘m not even close detecting 900 MHz at -70 dBm.

Any hint is welcome.



Spelling correction
[edited by: rosenrot at 3:58 PM (GMT -4) on 8 May 2022]