working of AD8302 evaluation board

The supply voltage to the board should be 5V so if you have 20V at the Vref port then you have the wrong supply, a massive overload input signal or some other problem. Check out all the connections and post a schematic or picture of your test setup.

MK

One more query, when the two input signals are applied to inpA and inpB, what should the output at Vmag and Vphs be look like?

If you want help you need to give me a bit more to work on !

Please explain what you are trying to do and "post a schematic or picture of your test setup"

(I'm going on holiday for a few days so I won't be looking at E14 again until 6/6/1026)

MK

It really depends on what those signals are, the outputs show the differentials between the 2 inputs.

refer to the datasheet http://www.analog.com/media/en/technical-documentation/evaluation-documentation/AD8302.pdf

page 4 of yhe datasheet has the pin function descriptions at from page 6 onwards there are a number of graphs that demonstrate the correlation between the input and output signals.

Thank you for the reply but what actually I want to ask is the output of the Vmag and Vphs pins on DSO be look like?

I am testing the board by applying 5V to Vp pin and Gnd at gnd pin and  sinusoidal signals at frequency 50MHz with mag -30dbm to both INPA and INPB.

And I am looking the output on DSO.

So, my question is that what output should I get on DSO? should it be a sine wave or triangular wave or anything else ?

what I am getting is varying output i.e output is not stable.

Thank you for the reply but what actually I want to ask is the output of the Vmag and Vphs pins on DSO be look like?

I am testing the board by applying 5V to Vp pin and Gnd at gnd pin and  sinusoidal signals at frequency 50MHz with mag -30dbm to both INPA and INPB.

And I am looking the output on DSO.

So, my question is that what output should I get on DSO? should it be a sine wave or triangular wave or anything else ?

what I am getting is varying output i.e output is not stable.

one more thing I am connecting that 5V biasing by connecting the wire from power supply at the round pin named Vp as marked by arrow nd gnd at the other pin.

Are the 2 input signals in phase with each other or are they random?

Also, how are you connecting the DSO for measurement? The outputs come from the terminals marked phase and gain on the bottom of the board. the signals come from the inside of the connector, the outside part is grounded. A Scope probe should be getting a signal from the centre of each pin, the ground clips on the scopes should be connected to a ground point.