ACPM-7813 Ver la hoja de datos (PDF) - HP => Agilent Technologies

Número de pieza

componentes Descripción

Fabricante

ACPM-7813

CDMA/AMPS Power Amplifier Module

HP => Agilent 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 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 pin.

Power Mode

PA_ON

Vcntl

Shut Down

LOW

0V

Low Power

HIGH

1.2V

Mid Power

HIGH

1.6V

High Power

HIGH

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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