CC2530-RBIAS 電阻值設置為多少依據(jù)是什么?

問題

CC2530-RBIAS 電阻值設置為多少依據(jù)是什么?

datasheet描述為

設置參考電流(bias resistor for reference currentreference current),,設置什么的參考電流呢?

電阻值對應的參考電流,計算方法是什么呢? 請幫忙詳細說明一下

參考設計設置是56K, why? 如果是要固定56k,??為什么不在芯片里固化呢?

為此，我還在IT官網(wǎng)問過此問題

TI回復及追問：??

類似電壓電流的偏置，如果精度或者阻值有變化會對內(nèi)部電壓和電流都造成影響，芯片內(nèi)部精度達不到

不需要計算，值是固定的56K，容差1％

e2e.ti.com/.../2896984

追問：? ? 還是沒有明白, 如何設置RBIAS 電阻值, 電阻值對應的參考電流,計算方法是什么?請幫忙詳細說明一下

TI回復：??這個值設計芯片時已經(jīng)固定了，不能更改，用戶只需要按數(shù)據(jù)手冊中的規(guī)定使用就行了

追問：? ?數(shù)據(jù)手冊, 什么都沒寫?

datasheet描述為

我想詳細了解一下,如何設置RBIAS 電阻值, 電阻值對應的參考電流,計算方法是什么?設置參考電流(bias resistor for reference currentreference current),,設置什么的參考電流呢?請幫忙詳細說明一下

TI回復：

手冊中說明了具體阻值

用戶只需要按要求使用規(guī)定的電阻就行了

至于計算方法和具體細節(jié)，這是芯片設計部分的問題，我無法對此做出更多評論

老外也同樣疑惑這個問題：

Other Parts Discussed in Thread: CC2530

RBIAS uses external resistor for internal biasing. Value in datasheet is mentioned to be 56kOhm and in application notes it is mentioned that precision resistor is required. Anyhow it is not mentioned that what tolerance is acceptable for RBIAS as using 56k resistor only for this purpose would be new part number for design and manufacturing while there would be e.g. already 56.2k used elsewhere.

TI回復如下：

Hello Janne,

The recommended tolerance on 56K bias resistor for CC2530 is ±1%.

Regards,

另一個老外　is crazy!!!

Why the RBIAS pin of the CC2530 should be connected to a 56K resistor？Why？I am crazy，HELP！

Other Parts Discussed in Thread: CC2530Why the RBIAS pin of the CC2530 should be connected to a 56K resistor？Why？
I know a base current is affected to the bias resistor，but which unit use the current？
ADC？DAC？RF？Amplifier？Comparator？
Why it is 56K，and ±1%，if not，what problem can be happen？
when use 47K or 62K，what probelm can be happen？
who can tell me？
I‘m crazy！??！
HELP！

TI回復：

Hi,
The RBIAS on all of our CC devices is used by an internal current source to setup a reference for the all analog circuits inside the device. If you change the value that we recommend the chip might not work at all. You need to use a 1% resistor and the value we use on that location. Furthermore you need to make sure there are no noise sources close to it as it will negatively influence the entire chip performance.
I would kindly recommend, next time you generate a post on this forum, to keep the discussion and the wording on purely technical terms and subjects.
The use of certain sentences may discourage people in the e2e community from helping you.
Thanks for your understanding.
TheDarkSide

兩個老外問內(nèi)容，與我一樣，大致意思，也和我問的一樣的，得到答案也一樣，按參考設計，不要問為什么。

最終結論：

無解，按規(guī)定用56K電阻, no why, 難怪老外會　crazzy