HPMX-2005-T10 Просмотр технического описания (PDF) - HP => Agilent Technologies

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HPMX-2005-T10

Silicon Bipolar RFIC 100 MHz Vector Modulator

HP => Agilent Technologies 

HPMX-2005 Modulation

Spectrum Diagrams

Figure 30, below, shows the test

set-up that was used to generate

the GSM, JDC and NADC modula-

tion spectrum diagrams that ap-

pear on the following page. The

major differences between these

tests are summarized in the table

below.

The modulation spectra are cre-

ated by setting the function gen-

erator to the appropriate bit-clock

frequency. The pattern generator

is set to produce a pseudorandom

serial bit stream (n = 20) that is

NRZ coded. The pseudorandom

bit stream which simulates the se-

rial data in a digital phone is fed

to the base-band processor that

splits it into a two bit parallel

stream (I and Q) and then filters

each according to the require-

ments of the digital telephone sys-

tem being simulated. The I and Q

signals from the baseband filter

are then DC offset by 2.5 V using

the op-amp circuit. The output of

the modulator is monitored using

a spectrum analyzer.

System

GSM

JDC

NADC

Bit Clock Frequency

270 kHz

42 kHz

48.6 kHz

Baseband Filter

0.3 GMSK (HP-8657B)

α = 0.5 π/4 DQPSK (HP-8657D)

α = 0.35 π/4 DQPSK (HP-8657D)

Channel (LO) Frequency

900 MHz

950 MHz

835 MHz

7-63

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