Magnetics Business & Technology - November/December 2020 - 17
TECH TIPS
Figure 3, Composite RF Performance Curves
Most of the spectral energy within the GbE signal lies in the
range of 60MHz and 125 MHz. Two key performance metrics
are insertion loss (SDD12) and return loss (SDD22). Insertion
loss is a measure of signal attenuation and return loss is a
measure of impedance matching. Mismatch between the cable
and the termination at the IC can result in noise due to signal
reflections.
Figure 3 shows composite RF performance
curves for 5 devices, 4 channels each. The performance limits are based on the IEEE 802.3ab
system specification. In both cases, each of the
4 channel has a unique characteristic and most
of the variation is due to the difference in circuit
layout for each channel. From part-to-part, the
performance clusters around the channel characteristics. The return loss is a key parameter for
passing radiated and conducted emissions testing. The performance shows a much tighter distribution compared to an implementation where the
transformers are hand wound and soldered into
place. In both cases, the performance matches
the performance of hand wound devices, however with much less variance.
In part 3 of this series, reliability data will be
summarized for the embedded magnetic design.
Additionally, the PCB material properties and
voltage isolation will be discussed.
About the Author:
Jim Quilici develops
PCB magnetics for
Shennan Circuits
(www.scc.com.cn).
He holds an MSEE
from University of
Arizona and has
over 30 years of
experience in develwww.MagneticsMag.com
oping magnetics and microelectronics. He has been awarded 9
patents associated with PCB magnetics. Jim also is a part-time
lecturer at California State University Sacramento where he
teaches courses on Network Analysis and Microelectronics. He
can be reached at jim.quilici@scc-america.com.
iC-TW28
10-bit Low-Latency Sin/Cos Interpolator
with Auto-Calibration and Line Driver
* Input up to 700 kHz, AB output up to 12.5 MHz
* Flexible interpolation rates of × 0.25 to × 256
* Fast commissioning: on push of a button
* Configuration via pins or SPI
* Field programmable: remote access
via Encoder Link
* 3.3 V, −40 °C to 125 °C
* Space-saving QFN of 5×5 mm
* On-Chip EEPROM and
RS422 driver
www.ichaus.de/tw28
phone: +49 6135 92 92-300
November/December 2020 * Magnetics Business & Technology
17
http://www.scc.com.cn
http://www.ichaus.de/tw28
http://www.MagneticsMag.com
Magnetics Business & Technology - November/December 2020
Table of Contents for the Digital Edition of Magnetics Business & Technology - November/December 2020
Magnetics Business & Technology - November/December 2020
Editor’s Choice/ Features
Paragraf Strides toward Commercializing Graphene- Based Hall Effect Sensors for Highly Precise Magnetic Measurement
Magnetics-Based Turboexpander Enables Energy Recovery from Pressure Letdown Stations in Natural Gas Pipelines
Buildup of Littoral Naval Forces Brings New Attention to Underwater Magnetic Sensing
Tech Tips
Embedding Magnetics Achieves Reliability & Consistency, Part 2 of 3
Product News
Industry News
Events Calendar/ Advertising Index
Visions
Magnetics Business & Technology - November/December 2020 - Magnetics Business & Technology - November/December 2020
Magnetics Business & Technology - November/December 2020 - Cover2
Magnetics Business & Technology - November/December 2020 - 3
Magnetics Business & Technology - November/December 2020 - Editor’s Choice/ Features
Magnetics Business & Technology - November/December 2020 - 5
Magnetics Business & Technology - November/December 2020 - Paragraf Strides toward Commercializing Graphene- Based Hall Effect Sensors for Highly Precise Magnetic Measurement
Magnetics Business & Technology - November/December 2020 - 7
Magnetics Business & Technology - November/December 2020 - Magnetics-Based Turboexpander Enables Energy Recovery from Pressure Letdown Stations in Natural Gas Pipelines
Magnetics Business & Technology - November/December 2020 - 9
Magnetics Business & Technology - November/December 2020 - 10
Magnetics Business & Technology - November/December 2020 - 11
Magnetics Business & Technology - November/December 2020 - 12
Magnetics Business & Technology - November/December 2020 - 13
Magnetics Business & Technology - November/December 2020 - Buildup of Littoral Naval Forces Brings New Attention to Underwater Magnetic Sensing
Magnetics Business & Technology - November/December 2020 - 15
Magnetics Business & Technology - November/December 2020 - Embedding Magnetics Achieves Reliability & Consistency, Part 2 of 3
Magnetics Business & Technology - November/December 2020 - 17
Magnetics Business & Technology - November/December 2020 - 18
Magnetics Business & Technology - November/December 2020 - 19
Magnetics Business & Technology - November/December 2020 - Product News
Magnetics Business & Technology - November/December 2020 - 21
Magnetics Business & Technology - November/December 2020 - 22
Magnetics Business & Technology - November/December 2020 - 23
Magnetics Business & Technology - November/December 2020 - Industry News
Magnetics Business & Technology - November/December 2020 - 25
Magnetics Business & Technology - November/December 2020 - 26
Magnetics Business & Technology - November/December 2020 - 27
Magnetics Business & Technology - November/December 2020 - Events Calendar/ Advertising Index
Magnetics Business & Technology - November/December 2020 - 29
Magnetics Business & Technology - November/December 2020 - Visions
Magnetics Business & Technology - November/December 2020 - Cover3
Magnetics Business & Technology - November/December 2020 - Cover4
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