Mobile Phone Testing using Impedance Tuners
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Mobile Phone Testing using Impedance Tuners Roman Meierer and Steve Dudkiewicz Your Complete Measurement & Modeling Solutions Partner. We Live in a 50 Ω World. The components have been designed for ideal 50 Ω operation!. When are we not at 50 Ω ?. 1) Antennas are not always 50 Ω by design

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Mobile Phone Testing using Impedance Tuners Roman Meierer and Steve Dudkiewicz

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Mobile phone testing using impedance tuners roman meierer and steve dudkiewicz

Mobile Phone Testing using Impedance Tuners

Roman Meierer and Steve Dudkiewicz

Your Complete Measurement & Modeling Solutions Partner


Mobile phone testing using impedance tuners roman meierer and steve dudkiewicz

We Live in a 50Ω World

The components have been designed for ideal 50Ω operation!


Mobile phone testing using impedance tuners roman meierer and steve dudkiewicz

When are we not at 50Ω?

1) Antennas are not always 50Ω by design

How much mismatch between phone and antenna can be tolerated?

2) Non-ideal reception conditions mimic non-50Ω conditions

Broken antenna

Driving inside tunnel

Talking inside elevator

How much mismatch between phone and antenna/outside-world can be tolerated?

How can we even test outside of 50Ω?


Mobile phone testing using impedance tuners roman meierer and steve dudkiewicz

Mobile Phone Testing Beyond 50Ω

It is not enough to test a phone at ideal 50Ω, it must be tested under realistic conditions!

Agilent 8960

- Acts as base station

- Sets active channel and power levels

- Measures power, BER, ACPR …

Maury MT98x Tuner

- Sets non-50Ω impedance

Maury AMTS Software

- Controls 8960 and tuner

- De-embeds VSWR and power levels to DUT reference

- Controls variable DC supply to mimic battery voltages

- Automates measurements


Mobile phone testing using impedance tuners roman meierer and steve dudkiewicz

What is the Agilent 8960?

“The Agilent 8960 is your one-box solution for wireless device development, manufacturing and repair - today and tomorrow “ – Agilent Technologies

Important Tests using 8960:

TX Power Test at specific PCL levels

RX Sensitivity BER testing

ACPR

Output Spectrum

Note: 8960 testing is at 50Ω condition only


Mobile phone testing using impedance tuners roman meierer and steve dudkiewicz

Tuner emulates mismatched antenna

In order to emulate all non-50Ω conditions, we remove the antenna from the phone and replace with cable connected to impedance tuner.

Impedance tuners can create any VSWR magnitude between 1:1 and ~10-200:1 and phase between 0-360°


Mobile phone testing using impedance tuners roman meierer and steve dudkiewicz

Easily Reproducible Test Conditions

Compact laboratory desktop setup results in easily reproducible test systems and results

No anechoic chamber or reference antenna needed

Test multiple modules under identical conditions in a fraction of the time, at multiple site locations!


Mobile phone testing using impedance tuners roman meierer and steve dudkiewicz

The SLIDE-SCREW TUNER


Mobile phone testing using impedance tuners roman meierer and steve dudkiewicz

Maximum Phone Power

14

12

Maximum 8960 Power

10

Phone Power

8

Tuner Loss

8960 Power

6

Power or Loss (dB)

4

2

Tuner Loss

0

0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1

Tuner Reflection

-2

Automatic Tuner or Manual Tuner ?


Mobile phone testing using impedance tuners roman meierer and steve dudkiewicz

Motors 2 & 3 (Probes)

Motor 1 (Carriage)

Slabline

The Pre-Calibrated Automated Tuner


Maury repeatability data

0

20

40

60

80

100

dB

Maury Repeatability Data

a

b

c

  • a) specification b) Worst case repeatabilityc) average repeatability


Mobile phone testing using impedance tuners roman meierer and steve dudkiewicz

Tuner Characterization (Calibration)

S-parameters are recorded for various X-Y positions of the tuner at each frequency of interest

loss is calculated in real-time

instant DUT de-embedding


Fixed source power lp

Fixed Source Power LP

Vds = 5.0 V

Idsq = 150 mA

Freq = 835 MHz

At maximum PAE of 70%

the power is 33 dBm

At maximum power of 38 dBm

the PAE is 51%


Mobile phone testing using impedance tuners roman meierer and steve dudkiewicz

AMTS Software for Agilent 8960


Mobile phone testing using impedance tuners roman meierer and steve dudkiewicz

TX Power Testing

  • Set Frequency/Channel

  • Set PCL transmit power level

  • Set VSWR magnitude and phase

  • Set DC voltage

  • Measure power delivered to antenna port as function of VSWR magnitude and phase


Mobile phone testing using impedance tuners roman meierer and steve dudkiewicz

RX Sensitivity Testing

  • Set Frequency/Channel

  • Set required BER (2% or other)

  • Set VSWR magnitude and phase

  • Set DC voltage

  • Measure sensitivity of phone for given BER as function of VSWR magnitude and phase


Mobile phone testing using impedance tuners roman meierer and steve dudkiewicz

Automation through Scripting

Pre-define list of frequencies/channels, power levels, battery voltages, VSWR settings

Automatically measure each line as a separate test  intelligent sequencing


Mobile phone testing using impedance tuners roman meierer and steve dudkiewicz

What do we do with the results?

1) Antennas are not always 50Ω by design

Tell the antenna designer how much mismatch is acceptable based on real-life tests

(did 2:1 VSWR at all phases meet requirements? 3:1?...)

  • 2) Non-ideal reception conditions mimic non-50Ω conditions

  • Did our mobile phone pass minimum requirements under pre-defined VSWR and voltage conditions?

  • After a large VSWR sweep plan, does the phone return to same performance at 1:1 VSWR? (performance may degrade 0.5-1.0 dB!)

  • Are there thermal stability issues? (performance may degrade 0.5-1.0 dB inside burst  check for “smooth” curves)

  • Is the phone design acceptable or must we redesign a component?

  • Is this a batch manufacturing issue?

These are only suggestions on how to analyze the data, the possibilities are endless!


Mobile phone testing using impedance tuners roman meierer and steve dudkiewicz

Mobile Phone Test System


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