CN-0507

Hi Sunnymaster,

Looking at other CN0507 inquiries, does this answer your question:

https://ez.analog.com/circuits_from_the_lab/f/q-a/542388/cn0507-vna-frequency-range

?

The serial protocol is described here:

https://wiki.analog.com/resources/eval/user-guides/circuits-from-the-lab/cn0507

This should give you a starting point for creating a new application.

-Mark

Hi Sunnymaster,

Looking at other CN0507 inquiries, does this answer your question:

https://ez.analog.com/circuits_from_the_lab/f/q-a/542388/cn0507-vna-frequency-range

?

The serial protocol is described here:

https://wiki.analog.com/resources/eval/user-guides/circuits-from-the-lab/cn0507

This should give you a starting point for creating a new application.

-Mark

Hi，mthoren_adi,

Thank you for your reply.I have browsed the information on this webpage

MarkThoren said:

wiki.analog.com/.../quote]

In Creating A New PC Applications part,I set the same serial port parameters as the UART Configuration part. When I send the 0X00040501 command and receive 0x0007050101aaaa, it means that the serial communication is successful. But when I tried to send the cmd_normal command to sweep the module from 1.7GHz to 3.4GHz, I found that the received data was 0x00060803aaaa, and then I used the serial monitor software to find that the cmd_normal sent by clicking the Start Sweep button on the GUI interface was 0x08f2, which was not in the Command List. 0x0803. I send 0x001108f26553f100caa7e200040d990000 through the serial port and the number of bytes in the Command Output part received is 312 which cannot correspond to the Return Values in the Command List. I want to know if there is a problem with the Command List part?

Thanks

Hi，mthoren_adi,

The Return Values of cmd_normal in the Command List is ADC code. What does Reference voltage ADC code mean? How to process In-phase voltage ADC code, Quadrature voltage and Reference voltage ADC code into S-parameters or the same data format as other vector network analyzers?

Thanks

Hi Sunnymaster,

We've contacted the engineers that support this board for assistance.

-Mark

Hi sunnymaster,

The ADC codes are the unsigned integer measurements from the internal ADC of the ADuCM3029. The ADC has been configured to use an internal 2.5V as reference. To convert the ADC codes into the correct in-phase and quadrature voltages, follow the steps below:

1. Convert the ADC code into voltage:

   V_inphase = (Reference_inphase_ADC_Code) * 2.5 volts / (2^12)

   V_reference = (Reference_voltage_ADC_Code) * 2.5 volts / (2^12)

2. Remove the reference voltage from the measurement

   V_inphase_final = V_inphase - V_reference

The s-parameters could then be computed from the V_inphase_final and the V_quadrature_final as discussed here https://www.analog.com/media/en/reference-design-documentation/reference-designs/cn0507.pdf.

Regards,

edwinu

should be  V_inphase = (Inphase_voltage_ADC_Code) * 2.5 volts / (2^12)

Hi edwinu,

Thank you for your reply.I can get the V_inphase_final  and V_inphase_final V_quadrature_final, to get S11 I should do further processing. From https://www.analog.com/media/en/reference-design-documentation/reference-designs/cn0507.pdf. the S11 function can be writen as

S11=(Port1_receive_V_inphase_final + j Port1_receive_V_quadrature_final)/(Port1_forward_V_inphase_final + j Port1_forward_V_quadrature_final)

Is my understanding correct?

Thanks，

sunnymaster

By definition, it should be 

S11=(Port1_reverse_V_inphase_final + j Port1_reverse_V_quadrature_final)/(Port1_forward_V_inphase_final + j Port1_forward_V_quadrature_final)