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Gain_Phase_Adapter.php    9295 Bytes    23-06-2024 16:56:22


GAIN - PHASE - ADAPTER USING THE AD 8302


A handy "ADD-ON" to hack together a VNA :-)



• DYNAMIC RANGE : < 60 dB
• FREQUENCY RANGE : > 1 GHz
• Pi-Attenuator at input and output to extend the range of the IC.



GAIN - PHASE - ADAPTER USING THE AD 8302





MEASUREMENT SETUP




In order to measure a Frequency Response / Phase Response, you'll need some more Devices:

• A Sawtooth Generator, 1 ... 50 Hz, Amplitude and Offset to be adjusted
• A VCO, MiniCircuits has a broad range of suiteable devices :-)
• A Power Splitter
• An Oscilloscope with X-Y capability, Set y-input to "INVERT"
• A power Supply :-)



GAIN - PHASE - ADAPTER USING THE AD 8302





TEST #1




Here we test the setup with (just) an attenuator. (MAGNITUDE)
A Voltage Drop (inverted !) of 20 dB x 27.5 mV (typically) = 550 mV may be observed.


  "THRU-CALIBRATION"
  20 dB Attenuator
  Adjust Level on Scope. (e.g. to 9 DIV)
  Insert a 20 dB Attenuator





TEST #2




Here we test the setup with a Bandpass at 70 MHz (ZFBP-70-S+ from MiniCircuits).
Scope is in X-Y Mode, as low sweeprates are needed for the filter to settle.
VCO is JTOS-150 with a Buffer.


  "THRU-CALIBRATION"
  Bandpass inserted
  Adjust Level on Scope. (e.g. to 9 DIV)
  Insert a D.U.T.





HINTS




Do not sweep to fast. The filter (D.U.T.) needs time to settle. Maybe change the lowpass consisting of R2, R3 and the feedthrough capacitor.

No, we do not sell the PCB. In case you want it, send the Target-Project File to the PCB-Manufacturer of you choice. E.g. Beta Layout

Resisitive Power Splitter have an Insertion Loss of 6 dB. Ensure your VCO delivers
+ 6 dBm to use maximum dynamic range of the circuit.




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t1 = 6585 d

t2 = 181 ms

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