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 

Test Setup I

(With Linear Tech Board)

Connect an RF signal generator

with GMSK modulated signal to

RFin EGSM port (RF2) or RFin

DCS/PCS (RF1) on the PA con-

trol board. The maximum input

power at RF1 and RF2 is

+10 dBm. Typically +2 dBm is

applied for the EGSM, DCS/PCS

channels. Connect two measure-

ment instruments, one for

spectrum analyzer and the other

VSA, to RFout (RF6). The maxi-

mum output power should be

limited to +35 dBm.

Connect the LTC-1758 demo

board and the ACPM-7891 PA

control board using 20 pin-

connection socket. The external

signal control board supplies

bias voltage to PA control board

and three timing signals — SHDN,

TXEN and PCTL — to generate

VPCA signal of the LTC1758. The

VPCA signal is Power control volt-

age output and drives VAPC

voltage of ACPM-7891 to define

power ramp profile. Figure C2 in

Appendix C details the LTC1758

timing diagram.

The RF power supply voltage of

the PA control board is set by

VBATT ADJ on the external signal

control board. This voltage can

be varied over a 2.7V to 5.3V

range and is nominally set to

3.5V. The VBATT voltage can be

monitored on TP5 on the PA

control board.

Linear Technologies supplies the

application program associated

with the .txt file to be down-

loaded to the FLASH memory.

The program controls the code

level of the DAC, whose data

range is –1V to +1V. –1V corre-

sponds to the zero code level and

the actual 10-bit DAC range is 0V

to +2.048V. The resolution is set

about 2mV per step. The first

sample of the data file is

assigned the “default” value,

which is included 1251 sample

waveform of input data. This is a

“code” value for the Lab View

application program. The first

sample being the default value

and the other 1250 samples

being the waveform data to be

outputted to the DAC. The

default value will then be loaded

into all memory locations after

the 1250 samples have been

loaded. After programming the

flash 16k segments the system

can be set to run by setting the

rotary switch to the programmed

memory segment and resetting

the external signal control board

using the reset switch.

Test Setup II

(Without Linear Tech Board)

Without LTC1758 demo board,

we can get the same test result

as above test. In this case, the

Agilent (HP) 3245A generates

two relevant signals, TX_EN and

RAMP with synchronized time.

Connect an RF signal generator

with GMSK modulated signal to

RFin EGSM port (RF2) or RFin

DCS/PCS (RF1) on the PA con-

trol board. Typically +2 dBm is

applied for the EGSM, DCS/PCS

channels. Connect two measure-

ment instruments, one for

spectrum analyzer and the other

VSA, to RFout (RF6). The maxi-

mum output power should be

limited to +35 dBm.

Agilent (HP) E4406A: The

Agilent E4406A, transmitter

tester is used to measure power

level in EGSM/DCS/PCS mode

displaying the characteristic

time mask.

Agilent (HP) E4437B: The signal

generator is used to provide

GMSK GSM modulated input sig-

nal at a defined frequency.

Agilent (HP)8593E: The Agilent

8991A is a spectrum analyzer

used to measure the output

power of diplexer in the fre-

quency and time domain.

Tek 2235: The Tek 2235 is an

oscilloscope used to monitor

RAMP signal and Vapc con-

nected using the test points of

PA control board.

Agilent (HP) 6623A: The Agilent

6623A, power supply is nomi-

nally set to voltage 3.5V for Vdd.

SHDN is set to 2.8V as high mode

during TXEN and RAMP are

enable.

Agilent (HP) 3245A: The Agilent

3245A, function generator with

two channels is set to two rel-

evant signals based on the GSM

specification. One signal gener-

ates TX_EN with 2.7V that has a

period of 4.615 ms with a duty

cycle of 12.5% (577 µs) and

216 Hz frequency. This TX_EN

connects to TX_EN (TP7) pin on

the RF control board.

The other signal is RAMP signal

that is same as PCTL of

LTC1758. This RAMP connects to

RAMP (TP6) pin on the RF con-

trol board.

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