HPMX-2003-T10 データシートの表示（PDF） - HP => Agilent Technologies

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HPMX-2003-T10

Silicon Bipolar RFIC 900 MHz Vector Modulator

HP => Agilent Technologies 

HPMX-2003 GSM

Applications

The GSM System

GSM (Group Speciale Mobile)

commonly refers to the European

digital cellular telephone system

standard. Digital cellular phones

for the European market must

conform to this standard. The

GSM system is characterized by

200 kHz channel spacing and mo-

bile to base transmit frequencies

of 890 - 915 MHz. The primary

modulation characteristics in-

clude 0.3 GMSK filtering of the I

and Q signals and 270 kbps trans-

mission rate.

Critical Performance

Parameters

GSM standards require that the

telephone exhibit RMS phase er-

ror ≤ 5°and peak phase error <20°.

The modulated output spectrum

of the phone must lie within a

“spectral mask” which defines

maximum allowable radiation lev-

els into adjacent and alternate

channels. Specifically, 200 kHz

from the channel center frequency

(f0), the output of the phone must

be at least 30 dB below the peak

output at f0. 400 kHz from f0 the

output must be 50-60 dB below

the peak output at f0 depending

upon the class of radio. Refer to

the GSM900 specifi-cations for

more detailed information.

HPMX-2003 Performance

Typical RMS phase error level of

2° and typical peak levels of 8°

makes the HPMX-2003 an excel-

lent choice for GSM applications.

The output spectrum falls easily

within the GSM spectral mask,

and the high power and simple

output configuration mean lower

components count, reduced size

and higher system efficiency.

Particulars of Use

Many of the GSM application

performance graphs shown in this

data sheet were created using the

test board shown in figure 21,

below.

The only external components re-

quired by this IC are four chip

capacitors. One capacitor is used

as a DC block on the input trans-

mission line. The second capaci-

tor (at pin 8) provides an AC

ground to one side of the differen-

tial LO input. The third and fourth

capacitors (at pins 1 and 16) are

for VCC bypass.

The circuit board includes an in-

ductive trace that can optionally

be used to minimize output VSWR

by placing a bypass capacitor at

various points along the inductive

line. Minimum VSWR for GSM

applications is achieved by plac-

ing the capacitor as shown in the

circle (inductance ≈2 nH).

The IC has an internal blocking

capacitor so the output is a simple

50 Ω transmission line. An

enlarged scale layout of the test

board can be found on the last

page of this data sheet.

VER. 1

C

C

LO

Q

C

C

OUT

R

VCC

5V

I

R

Figure 21. HPMX-2003 GSM Test Board.

7-47

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