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发表于 2009-2-17 22:17:09
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Impedance Testing For Mobile Phones
An Introduction to Load Pull
The following is an excerpt from Maury Microwave
Corporation Application Note 5C-041, Theory of
Load and Source Pull Measurement:
“Load pull consists of varying or “pulling” the
load impedance seen by a device-under-test
(DUT) while measuring the performance of the
DUT. Source pull is the same as load pull except
that the source impedance is changed instead of
the load impedance. Load and source pull is used
to measure a DUT in actual operating conditions.
This method is important for large signal,
nonlinear devices where the operating point may
change with power level or tuning.”
For a full introduction, please download Maury data sheet
5C-041 or a number of other application notes from:
http://www.maurymw.com/support/appnoteslibrary/appnoteslib.htm
Power Amplifier and Front End
Module Load Pull
A basic load pull setup consists of:
• Tuners to vary the source and/or load impedance
seen by the DUT
• Signal generator to provide input signal to DUT
• Power meter with sensors to record input and output
power levels (to be de-embedded to the DUT reference
plane)
• Spectrum analyzer to read power levels at individual
frequencies (including harmonics), to measure multitone
parameters (IMD, TOI . . .) or to measure modulated
parameters (EVM, ACPR . . .)
• DC power supply to provide bias to DUT
• Components for amplification, attenuation, biasing,
coupling . . .
Author: Steve Dudkiewicz, Maury Microwave Corporation
ABSTRACT:
Load Pull is an invaluable tool for the mobile phone community, helping to design more robust and efficient
products and guarantee their sucessful functionality in real-world environments. Mobile phones and their subcomponents
can be tested in various stages: the internal power amplifier (PA), the front-end module (FEM), or the
phone in its entirety.
Maury MT993 ATS software is used to test PAs and FEMs for dozens of parameters including Power, Gain, Efficiency,
Harmonic Power, Inter-modulation Distortion (IMD), Error-Vector Magnitude (EVM), Adjacent Channel Power
Ratio (ACPR), etc.
Maury MT910 series software is a standalone application designed specifically for the testing of mobile phones in
transmit and receive modes, for output power and sensitivity respectively, as a function of VSWR magnitude and
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