[MTK] EDGE PA Vbias与PA Vramp电压之间的关系

[DESCRIPTION]
GSM900 band Vbias PCL=5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,-1
GSM900 band Vbias=200,200,200,200,200,200,200,200,200,200,200,200,200,200,200,200
GSM900 band Gain(dB)=34.18750,34.18750,34.18750,34.15625,34.06250,33.75000,33.56250,33.43750,33.46875,33.43750,33.62500,33.62500,33.62500,33.62500,33.62500,35.00000
这一块的VBias最大可设多少？对应的电压转换关系是怎样的？

[SOLUTION]

PA Vbias是指EDGE的偏置电压；
PA 工作在EDGE mode时  PA Vramp需要设定的电压与PA Vbias的关系：
Vramp (V) = 2.8 (V) 24K/(24k +10k) (pa_vbias4 + dc_offset ) / 1024

建议使用验证过的PA,使用.ini中默认的PA Vbias；可根据EDGE mode PA Vramp的要求，算出合适的Vbias值。