Power Amplifier (Pa) Module - Silicon Laboratories Si4010 Software Programming Manual

7.12. Power Amplifier (PA) Module

This tunes the power amplifier (PA) to the attached antenna impedance. During PA tuning a limited RF power
appears on the antenna for about 100–300 µs.
The values for the PA setup tPa_Setup structure members for initializing the PA by using vPa_Setup() function
should be calculated by the
7.12.1. PA Module Structures
tPa_Setup
Description: A pointer to a structure of this type is used as an input to the vPa_Setup()
function. The following table lists the members belonging to the tPa_Setup structure. For
complete details on implications of structure members see descriptions of corresponding
registers along with the Power Amplifier section in the Si4010 datasheet.
The structure values should be calculated by the si4010_calc_regs.xls spreadsheet. See
"AN547: Si4010 Calculator Spreadsheet Usage" for more details
Name
fAlpha
fBeta
bLevel
bMaxDrv
wNominalCap
si4010_calc_regs.xls
Type Bits
float 32 Alpha parameter of PA tuning. Use described in
vPa_Tune() function below.
float 32 Beta parameter of PA tuning. Use described in
vPa_Tune() function below.
BYTE 7 PA transmit power level.
BYTE 1 Boost bias current to output DAC. Allows for maximum
10.5mA drive. Only LSb bit (bit 0) is used.
WORD 9 Value written to XREG wPA_CAP
spreadsheet based on the user application parameters.
Description
Rev. 1.0
AN370
77