AWR1243: Received Power

Sam Bonsor59

Part Number: AWR1243

Hello,

I am intending to obtain the power received by the radar. To do this I've been informed that I need to know the rail voltage and number of levels and I can then use the equation: Voltage=(rail voltage)*(amplitude of ADC signal)/(number of levels) to obtain the received voltage and then use this and the impedance to get the received power.

My issue is that I can't seem to find these quantities (rail voltage, number of levels ,and impedance) on the data sheet anywhere, is there anywhere I can find these values? Or is there another way to obtain the received power so I can compare it to the transmitted power?

Thanks,

Sam Bonsor

over 7 years ago

0 Kyle Cousino over 7 years ago

TI__Mastermind 24955 points

Sam,

You can find the supply voltage for the ADC on page 14 of the datasheet for the AWR1243 device. This datasheet can be found here: www.ti.com/.../awr1243.pdf

The supply voltage for the ADC is 1.8 volts.

The number of levels you refer to are set by the user and can be a configuration of either 12 bits, 14 bits, or 16 bits. This is specified by the user when setting up the device at run time. So for 12 bits of resolution, there are 2^12 or 4,096 levels.

The ADC impedance is an internal design detail which we cannot share.

Regards,
Kyle

0 Sam Bonsor59 over 7 years ago in reply to Kyle Cousino

Intellectual 455 points

Thanks for your reply, just to check that I've understood this correctly: An ADC reading of 65536 (2^16) using the 16 bit setting corresponds to a voltage at the ADC input of 1.8V? Further, is the scale linear, i.e would a reading of 2^15 (using the 16 bit setting) correspond to a voltage at the ADC input of 0.9V?

Thanks,
Sam

0 Kyle Cousino over 7 years ago in reply to Sam Bonsor59

TI__Mastermind 24955 points

Sam,

Your understanding of both questions in correct. The scaling of the ADC is linear. However, the ADC will only output values from 0 to 2^n - 1. So for 16-bit ADC, the output values span from 0 to 65,535.

Regards,
Kyle

0 Sam Bonsor59 over 7 years ago in reply to Kyle Cousino

Intellectual 455 points

Great, thanks a lot for your help.

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AWR1243: Received Power