CC2640R2F: About the AGC

Choongbeom You

Part Number: CC2640R2F

Hi, I'm using simplelink_cc2640r2_sdk_5_30_00_03 and blestack not 5.

Through a few threads about AGC, I found the following:

1. AGC is enabled by default.

2. To disable AGC, change HW_REG_OVERRIDE(0x6084, 0x05F8) in the ubRfRegOverride[] of the urfc.c to HW_REG_OVERRIDE(0x6084, 0x05FF) for example.

--> The range is 0x0500 to 0x05FF

Here's my questions,

1. In terms of current consumption, is it better to enable AGC or doesn't matter to use a fixed gain?

2. Under normal circumstances, is it better to enable AGC or doesn't matter to use a fixed gain?

Thanks,

Calvin

over 4 years ago

0 Ryan Brown1 over 4 years ago

TI__Guru**** 223757 points

Hi Calvin,

1. The AGC does not have a significant effect on the current consumption.

2. There are some unique instances in which a fixed gain is preferred (see the "Similar topics" threads to the right of this page) but for typical operations the AGC is left enabled by default.

Regards,
Ryan

0 Choongbeom You over 4 years ago in reply to Ryan Brown1

Expert 1700 points

Thank you Ryan,

Could you explain about the "some unique instance" or let me know which thread to see?

It's hard to find out.

+1 Ryan Brown1 over 4 years ago in reply to Choongbeom You

TI__Guru**** 223757 points

Further investigate the timing between two BLE events: https://e2e.ti.com/f/1/t/751455
Attempting to conduct relative electrical measurements using the CTE measurement methods, so the the IQ data of every packet needs to have the same gain: https://e2e.ti.com/f/1/t/856175 https://e2e.ti.com/f/1/t/865255

Regards,
Ryan

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CC2640R2F: About the AGC