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

部品番号

コンポーネント説明

一致するリスト

HPMX-2003-T10

Silicon Bipolar RFIC 900 MHz Vector Modulator

HP => Agilent Technologies 

HPMX-2003 Modulation

Spectrum Diagrams

Figure 20, below, shows the test

setup that was used to generate

the modulation spectrum dia-

grams that appear on the GSM,

JDC and NADC applications pages

of this data sheet. The major dif-

ferences between the 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

serial 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

1

Iref

HP-8563E

SPECTRUM ANALYZER

HPMX-2003/5

H

HP-8657B

SIGNAL GENERATOR

835-950 MHz

2

Qref

HP-3314A

FUNCTION

GENERATOR

HP-3780A

PRBS GENERATOR

CLOCK

DATA

π/4DQPSK Q INPUT

+5 V

•–

•+

Q + 2.5 V

Qref = 2.5 V

ALL R = 5 k

OP-AMP: TL-084

I CHANNEL IS IDENTICAL

HP-8657B

OR

HP-8657D

BASEBAND

PROCESSOR

I

OP-AMP CIRCUIT

Q

(SEE ABOVE)

I + 2.5 V TO 1

2.5 V TO Iref

Q + 2.5 V TO 2

2.5 V TO Qref

Figure 20. Test Equipment Setup for Modulation Spectrum Diagrams.

7-46

Share Link: