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AD835 problem

Question asked by IvanT. on Apr 10, 2013
Latest reply on Apr 11, 2013 by Emman.A

Greetings to All,

 

Unexpectedly I've faced a problem with Analog Devices IC. I'm hoping for your help.
To test the circuit I use two signals: 40 MHz at X1 input, 1kHz at Y1 input. Both signals are single ended and fed through a series capacitors, X2 and Y2 are grounded. Although frequencies are relatively low, I used proper supply decoupling capacitors as it is advised in the datasheet.
1) What I see at W output does look like a sum of the signals at X1 and Y1 inputs. I see no multiplication.
2) The other thing that confuses me is that I see -1.68V DC at X1 and Y1 inputs. Is that correct and AD835 should have these DC voltages at inputs? Is it correct to feed AD835 with AC coupled signals?

 

Kind regards,

 

Ivan Tsvelykh.

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