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HPMX-2003-T10

Silicon Bipolar RFIC 900 MHz Vector Modulator

HP => Agilent Technologies 

HPMX-2003 Single and

Double Sideband

Performance

Single sideband (SSB) and double

sideband (DSB) tests are some-

times used to evaluate modulator

performance. Figure 17, below,

shows the test equipment setup

that was used to create the SSB

and DSB output spectrum graphs

(figures 15 and 16).

The phase shift provided by the I

and Q signal generators must be

very close to 90 degrees and the

amplitude of the two signals must

be matched within a few millivolts

or results will not accurately re-

flect the performance of the

modulator IC.

The I, Q signal generator must put

out low distortion signals or the

output spectrum will show high

harmonic levels that reflect the

performance of the signal genera-

tor, not the modulator.

HPMX-2003 Typical Sideband Performance Data

SSB: VIref = VQref = 2.5 V, VImod = VIref +1.25 sin (2π f t), VQmod = VQref + 1.25 cos (2π f t), f = 25 kHz

DSB: VIref = VQref = 2.5 V, VImod = VIref +1.25 cos (2π f t), VQmod = VQref + 1.25 cos (2π f t), f = 25 kHz

Symbol

Parameters and Test Conditions

Units

SSB

PLSB

LOleak

PUSB

Lower Sideband Power Output

LO Suppression

Upper Sideband Power Output

dBm

+3

dBc

34

dBm

-32

IM3

Third Order Intermodulation Products

dBm

NA

DSB

0

31

0

-34

5

-5

-15

-25

-35

-45

-55

-65

-75

899.9

899.95

900

FREQUENCY (MHz)

900.05

900.1

Figure 15. Single Sideband Output Spectrum.

LO␣ =␣ -12␣ dBm at 900 MHz. The Test Setup is Shown

in␣ Figure␣ 1 7.

HP-8657B SYNTHESIZED SIGNAL GENERATOR

5

-5

-15

-25

-35

-45

-55

-65

-75

899.9

899.95

900

900.05

900.1

FREQUENCY (MHz)

Figure 16. Double Sideband Output Spectrum.

LO␣ =␣ -12␣ dBm at 900 MHz. The Test Setup is Shown

in␣ Figure 1 7.

COS

HP-3245A UNIVERSAL SOURCE

OPT 001

DUAL OUTPUTS WITH 90 DEGREE

RELATIVE PHASE SHIFT

DSB

SIN

SSB

VER 1

C

C

LO

Q

C

C

OUT

R

VCC

5V

I

R

HP-8595A SPECTRUM ANALYZER

Figure 17. HPMX-2003 Single/Double Sideband Test Setup.

7-44

HP-6626A

SYSTEM DC

POWER SUPPLY

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