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 Typical Data

Measurement

Direct measurement of the ampli-

tude and phase error at the output

is an accurate way to evaluate

modulator performance. By mea-

suring the error directly, all the

harmonics, LO leakage, etc. that

show up in the output signal are

accounted for. Figure 3, below,

shows the test setup that was used

to create the amplitude and phase

error plots (figures 12 and 13).

Amplitude and phase error are

measured by using the four chan-

nel power supply to simulate I and

Q input signals. Real 2.5 Vp-p I and

Q signals would swing 1.25 volts

above and below an average 2.5 V

level, therefore, a “high” level in-

put is simulated by applying

3.75␣ V, and a “low” level by apply-

ing 1.25 V to the I and/or Q inputs.

Amplitude and phase are

measured by setting the network

analyzer for an S21 measurement

at frequency of choice. Set the

port 1 stimulus level to the LO

level you intend to use in your cir-

cuit (-12 dBm for the data sheet).

A 6-10 dB attenuator can be

placed in the line to port 2 to pre-

vent network analyzer overload,

depending upon the network ana-

lyzer you are using.

By adjusting the VImod and VQmod

settings you can step around the

I, Q vector circle, reading mag-

nitude and phase at each point.

The relative values of phase and

amplitude at the various points

will indicate the accuracy of the

modulator. Note: you must use

very low ripple power supplies

for the reference, VImod, and VQmod

supplies. Ripple or noise of only a

few millivolts will appear as wob-

bling phase readings on the net-

work analyzer.

The same test setup shown below

is used to measure input and out-

put VSWR, reverse isolation, and

power vs. frequency. VImod and

VQmod are set to 3.75 V and the

appropriate frequency ranges are

swept. S11 provides input VSWR

data, S22 provides output VSWR

data. S21 provides power output

(add source power to S21 derived

gain).

LO leakage data shown in figures

18, and 19 is generated by setting

VImod = VQmod = VIref = VQref = 2.5 V

then performing an S21 sweep.

Since phase is not important for

these measurements, a scalar net-

work analyzer or a signal genera-

tor and spectrum analyzer could

be used.

5V

VQmod

HP-6626A

SYSTEM DC POWER SUPPLY

(FOUR OUTPUTS)

2.5 V

VImod

HP-8753C VECTOR NETWORK ANALYZER

PORT 1

PORT 2

VER 1

C

C

I

R

LO

Q

C

C

OUT

R

VCC

5V

Figure 3. Test Setup for Measuring Amplitude and Phase Error, Input and Output

VSWR, Power Output and LO Leakage of the Modulator.

7-41

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