ACPM-7833 View Datasheet(PDF) - HP => Agilent Technologies
Part Name
Description
MFG CO.
'ACPM-7833' PDF : 21 Pages View PDF
2. Step Bias Control and Dynamic
Bias Control (if controled PDM1)
The PDM1 output from the
baseband IC can be used to
create a software-programmable
voltage, to be used at the phone
designer’s discretion. To get high
efficiency and better ACPR, the
phone designers can change
control voltage of the PA by
adjusting PDM1 voltage accord-
ing to output power of PA. A
caution when using this
approach—careful consideration
must be made to to avoid an
abrupt discontinuity in the
output signal when the step bias
control voltage is applied.
The figure below is an example of
how to control the PA for
multiple bias points using the
PA_ON and Vcntl pins.
Power Mode
Shut Down
Low Power
Mid Power
High Power
PA_ON
LOW
HIGH
HIGH
HIGH
Vcntl
0V
1.2V
1.6V
2.5V
Power Range
—
~ -5 dBm
-5 dBm ~ 13 dBm
13 dBm ~ 28.5 dBm
To Duplexer
Vbias
Vdd2
Vdd1 PA
Vcntl
Battery
TxIC
Enable
Switch Circuit for PA
R1
C1
Baseband
IC
PA_ON
PDM1
If PDM1 can be controlled then same circuit can be used for Dynamic bias control
12
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