ACPM-7891 데이터 시트보기 (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 

Figure 4 depicts the basic block

diagram of the ACPM-7891 PA

control board, Figure 5 shows the

control board layout, and Table 3

details its bill of materials.

The supporting LTC1758

demoboard is available upon

request from Linear Technology.

It has a 900 MHz and an

1800 MHz RF channel controlled

by the LTC1758. Timing signals

for TXEN are generated on the

board using a 13 MHz crystal ref-

erence. The PCTL power control

pin is driven by a 10-bit DAC

and the DAC profile can be

loaded via a serial port. The se-

rial port data is stored in flash

memory which is capable of stor-

ing eight ramp profiles. The

board is supplied preloaded with

four GSM power profiles and

four DCS power profiles, cover-

ing the entire power range.

External timing signals can also

be used in place of the internal

crystal controlled timing.

68Ω

33 pF

SHDN

VBATT

VIN

VCC

RF

LTC1758

SHDN

VPCA

TXEN

GND

PCTL

TXEN

DAC

RFin

DCS/PCS

16

14

VAPC DCS/PCS Vdd3 DCS/PCS

2.2 pF

220 pF

33 pF

18

RFin DCS/PCS

RFout DCS/PCS

11

33 pF

ACPM-7891

RFin EGSM

26 RFin EGSM

VAPC EGSM

2

RFout EGSM 7

33 pF

Vdd EGSM

4

33 pF

220 pF

2.2 pF

DIRECTIONAL

COUPLER

50Ω

50Ω

DIRECTIONAL

COUPLER

Figure 4. Block Diagram of the ACPM-7891 PA Control Board.

DIPLEXER

RFout

15

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