ACPM-7891 データシートの表示（PDF） - HP => Agilent Technologies

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ACPM-7891

Tri-Band Power Amplifier Module EGSM, DCS and PCS Multi-slot GPRS

HP => Agilent Technologies 

Applications Information

Introduction

The Agilent ACPM-7891 provides

a cost effective dual or tri-band

GSM Power Amplifier (PA) solu-

tion with the additional benefit

of multi-slot GPRS operation,

giving excellent efficiency and

extended transmit time. Figure 1

illustrates how the ACPM-7891

fits into a typical dual-band or

tri-band terminal design. The

device is internally matched to

50Ω and therefore an effective

design can be implemented

quickly with a few additional

capacitors for d.c. blocking of the

output ports and bypassing of

the supply pins.

Chipset

Transmit

Baseband

DAC

Receive

ACPM-7891

900MHz

1800MHz

1900MHz

Loop Control

900MHz

1800MHz

1900MHz

Switch/Diplexer

Coupler

Antenna

The control loop can also be

implemented quickly by using an

integrated power controller such

as the LT1758-2 from Linear

Technology. An example using

this controller is given later in

this note. The required loop per-

formance and stability can be

achieved more easily in this way,

without the need for complex

and time consuming design work

around an external error com-

parator or discrete Schottky

diode detector.

Demoboards are available, and

design engineers can evaluate

the RF performance of the

ACPM-7891 power amplifier to

implement a solution quickly by

using this application note in

conjunction with the datasheet.

Figure 1. ACPM-7891 in a Typical Dual-band or Tri-band Terminal.

ACPM-7891 Performance

Figure 2 plots the actual output

power of the ACPM-7891 PA for

GSM900, DCS1800 and PCS1900

bands as a function of the con-

trol voltage, Vapc. The input

power to the PA is a GMSK

modulated RF carrier of a con-

stant power level of 2 dBm. The

PA’s maximum output power is

35 dBm in the GSM900 band,

and 33 dBm for the DCS1800/

PCS1900 band at a control volt-

age of 2.2V. The input RF carrier

and control voltage are both

pulsed, following the GSM TDMA

characteristic response with a

period of 4.615ms and a duty

cycle of 12.5~25% per the GSM

standard.

40

35

30

25

20

15

10

5

0

-5

EGSM

-10

DCS

PCS

-15

-20

0.75 0.95 1.15 1.35 1.55 1.75 1.95 2.15

Vapc (V)

Figure 2. Output Power vs. Control Voltage for

the ACPM-7891 Power Amplifier.

12

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