If you see the squiggly lines ...!

They are for creating a 50 ohm match !! 

New adc board to play with !!! Cool :)

Still don't know what this one is :

Let's do this ! 

DAQ board working :) Screenshots from measurements

The above shows a perfect I/Q 90 deg phase shifted output for one channel.

The spectrum of output is as follows (Inout -40dBm, 31 Mhz)

Great !working !!! Switched wrong !!

Initial switching : 

Which means - 

Notice red will cancel !! 

we need alternate switching!! 

Input now : 

The voltage settings :

NOTE : vdd of -5 reduced the gain to zero !! 

Some mismatch are still visible

The probing was done as seen below : 

Mischief managed :)

mixer operation revisited :

This determines the switch connectivity 

Random - 30 dB gain

Measuring all dc points 

zooming in on the discrepancies : 

That's your Tia !! 

there is current inversion : 

The green on is @5 and blue @3v supply !