ACPM-7833-TR1 데이터 시트보기 (PDF) - Avago Technologies

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ACPM-7833-TR1

CDMA1900 (PCS) Power Amplifier Module

Avago Technologies 

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 according 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

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