What is the definition and meaning of AWR1843 RF Gain Target?

Hi Cesar

There are two questions.
First, from the forum you asked to refer to, is it correct to think of the RX chain as the format shown in Figure 1 below?

(https://e2e.ti.com/support/sensors-group/sensors/f/sensors-forum/711285/awr1243-what-s-different-between-rx-gain-and-rf-gain-target)

Second, is it safe to assume that the RF gain target is set assuming the dB reflected from the object?
(Example: Set RF Gain Target to 30 dB when the dB reflected from the object is likely to be 28 dB)

                                 Fig1. RX Chain

First: Yes

Second: RF Gain is set as high as possible even if dB reflected from object is lower

thank you

Cesar

Thank you for answering the question.

After all, under what circumstances should the RF Gain Target be set high or low?

Is it okay to think that RF Gain Target changes the gain of the RF part of RX Gain?

Thank you for answering the question.

If the design procedure for actually determining the RX gain with radar is the flow shown below, is it okay?

1. Calculation of radio wave intensity (dB)
Assume the value of the radio wave intensity acquired by the antenna from the object and the detection distance.

2. RF Gain Target determination
Set the RF Gain Target to a value higher than the maximum intensity obtained by the antenna.
(Example: If the maximum signal strength acquired by the antenna is 20 dB, the RF Gain Target is 30 dB.)

3. VGA Gain setting
After that, set the VGA gain so that the object is detected.

Is this the way of thinking?

Excuse me again.

Is it correct to think that changing the RF Gain Target will change the gain on the RF side?

(ex)
If you set the RF Gan Target to 30 dB and the VGA Gain to 24 dB, the RX Gain will be 54 dB.

With this, it can be determined whether the sum of the radio wave intensity x (dB) received by the receiving antenna and the RX Gain can be detected or not under the following conditions.
Let min and max be the minimum and maximum intensities of radio waves that can be detected by millimeter-wave radar, respectively.

(i) When min <x + 54 <max
Detectable

(ii) When x + 54 <min or max <x + 54
Undetectable

-------------------------------------------------- -------------

that's all.
I'm really sorry that the story has become long.

Hi,

Please give me a few days to check with design team

Thank you

Cesar

OK, Thank you!

I should be able to provide you an answer by wednesday evening CST

thank you

Cesar

Roger !
Thank you!

Thank you

Cesar

After all, you can set the RF Gain Target and the VGA Gain will be the value that can be obtained from the actual radio field strength.

RX = RF + VGA

(Adjusted by RF: RF Gain Target) (VGA: Actual RX signal strength minus RF Gain)

Thank you

Do you have additional questions

thank you
Cesar

No, isn't my idea wrong before the additional question?

(I said)

After all, you can set the RF Gain Target and the VGA Gain will be the value that can be obtained from the actual radio field strength.

RX = RF + VGA

(Adjusted by RF: RF Gain Target) (VGA: Actual RX signal strength minus RF Gain)