mga-725m4 Avago Technologies, mga-725m4 Datasheet - Page 19

• Manufacturer Part Number: mga-725m4
• Description: Low Noise Amplifer With Bypass Switch In Miniature Leadless Package
• Manufacturer: Avago Technologies

Statistical Parameters
Several categories of parameters appear within the
electrical specification portion of the MGA-725M4 data
sheet. Parameters may be described with values that
are either “minimum or maximum”, “typical” or “standard
deviation”.
The values for parameters are based on comprehensive
product characterization data, in which automated
measurements are made on a statistically significant
number of parts taken from nonconsecutive process lots
of semiconductor wafers. The data derived from product
characterization tends to be normally distributed, e.g., fits
the standard bell curve.
Parameters considered to be the most important to
system performance are bounded by minimum or
maximum values. For the MGA-725M4, these param-
eters are: V
guaranteed parameters is 100% tested as part of normal
manufacturing and test process.
Values for most of the parameters in the table of Electri-
cal Specifications that are described by typical data are
mathematical mean (µ), of the normal distribution taken
from the characterization data. For parameters where
measurements of mathematical averaging may not be
practical, such as S-parameters or Noise Parameters and
the performance curve, the data represents a nominal
part taken from the center of the characterization distri-
bution. Typical values are intended to be used as a basis
for electrical design.
To assist designers in optimizing not only the immediate
amplifier circuit using the MGA-725M4, but to also
evaluate and optimize trade-offs that affect a complete
wireless system, the standard deviation (σ) is provided
for many of the Electrical Specification parameters (at
25°C). The standard deviation is a measure of variability
about the mean. It will be recalled that a normal distribu-
tion is completely described by the mean and standard
deviation.
For product information and a complete list of distributors, please go to our web site:
Avago, Avago Technologies, and the A logo are trademarks of Avago Technologies, Limited in the United States and other countries.
Data subject to change. Copyright © 2005-2008 Avago Technologies, Limited. All rights reserved. Obsoletes 5989-4191EN
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Standard statistics tables or calculations provide the
probability of a parameter falling between any two
values, usually symmetrically located about the mean.
Referring to Figure 15 for example, the probability of a
parameter being between ±1σ is 68.3%; between ±2σ is
95.4%; and between ±3σ is 99.7%.
Figure 15. Normal Distribution Curve.
Phase Reference Planes
The positions of the reference planes used to specify
S-parameters and Noise Parameters for the MGA-725M4
are shown in Figure 16. As seen in the illustration, the
reference planes are located at centre of package solder
pads.
S and Noise Parameter data was taken with the package
mounted to 50 ohm lines on 10 mil alumina substrates,
and the ground pads were connected directly to the
substrate ground plane through a solid metal rib.
Designers should include the parasitics of the grounding
system used in their application.
Figure 16. Phase Reference Planes.
-3σ
-2σ
Bottom View
-1σ
Parameter Value
68%
95%
99%
Mean (µ)
(typical)
+1σ +2σ
Reference
Planes
+3σ