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Subject: Includes: DDR4 Design & Signal Integrity Challenges
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Design Engineers Bulletin



We value your opinion click here to provide feedback  
http://mailing.emedia-us.com/t/1886112/66375645/6465801/0/?e5e2987d=MTg4NjExMg%3d%3d&7fb2ef93=NzkyMDA5MQ%3d%3d&e5e2987d=MTg4NjExMg%3d%3d&c73c8e04=ZGVuZ24%3d&4f415564=NjYzNzU2NDU%3d&x=2874c3bc



In this Issue

 

Shortfalls of 2D Manufacturing 

 

Can Manual PCB Routing & Automation Coexist? 

 

DDR4 Design & Signal Integrity Challenges 

 

Avoiding Reed Relay Problems 

 

Jitter Noise Duality & Anatomy of an Eye Diagram 





 

Shortfalls of 2D Manufacturing

Product development has embraced the benefits of 3D CAD solutions for 
years. However, many organizations are still using 2D paper drawings to 
convey the information needed for manufacturing. Learn in this white paper 
the many ways model-based definition (MBD) helps manufacturers.



Download now

http://mailing.emedia-us.com/t/1886112/66375645/6502853/0/?301bfbbf=NTIwODA5Nw%3d%3d&7fb2ef93=NzkyMDA5MQ%3d%3d&e5e2987d=MTg4NjExMg%3d%3d&e5e2987d=MTg4NjExMg%3d%3d&c73c8e04=ZGVuZ24%3d&4f415564=NjYzNzU2NDU%3d&x=0f999743 






 

Can Manual PCB Routing & Automation Coexist?

Historically, the best design printed circuit boards (PCB) auto-routing 
success is achieved when the design team has taken time to plan, place, 
constrain and prioritize the design database with auto-routing in mind. 
This paper describes how to enable PCB designers to route high-quality, 
rule-driven designs quickly and easily with the look and feel of a 
hand-routed design.



Download now

http://mailing.emedia-us.com/t/1886112/66375645/6502854/0/?301bfbbf=NTIwODA5Nw%3d%3d&7fb2ef93=NzkyMDA5MQ%3d%3d&e5e2987d=MTg4NjExMg%3d%3d&e5e2987d=MTg4NjExMg%3d%3d&c73c8e04=ZGVuZ24%3d&4f415564=NjYzNzU2NDU%3d&x=0414041d 




 

DDR4 Design & Signal Integrity Challenges

New factors in DDR4, such as an asymmetric termination scheme, data bus 
inversion and signal validation using eye masks require new methods of 
validating designs through simulation. This paper investigates the effects 
of DDR4’s Pseudo Open Drain (POD) driver on data bus signaling and 
describes methodologies for dynamically calculating the DRAM’s internal 
VrefDQ level required for data eye analysis.



Download now

http://mailing.emedia-us.com/t/1886112/66375645/6502855/0/?301bfbbf=NTIwODA5Nw%3d%3d&7fb2ef93=NzkyMDA5MQ%3d%3d&e5e2987d=MTg4NjExMg%3d%3d&e5e2987d=MTg4NjExMg%3d%3d&c73c8e04=ZGVuZ24%3d&4f415564=NjYzNzU2NDU%3d&x=a90e812d 




 

Avoiding Reed Relay Problems

Reed relays are often considered a mundane component by design engineers 
and sometimes little thought is given to the finer points of their 
specifications. If used correctly, reed relays are very reliable devices. 
Discover how to avoid common problems to greatly enhance the reliability 
and performance of your designs.



Read now

http://mailing.emedia-us.com/t/1886112/66375645/6502856/0/?301bfbbf=NTIwODA5Nw%3d%3d&7fb2ef93=NzkyMDA5MQ%3d%3d&e5e2987d=MTg4NjExMg%3d%3d&e5e2987d=MTg4NjExMg%3d%3d&c73c8e04=ZGVuZ24%3d&4f415564=NjYzNzU2NDU%3d&x=593c6e83 




 

Jitter Noise Duality & Anatomy of an Eye Diagram

As the technology of serial data transmission has developed there has been 
alternating emphasis on the jitter problem or the noise problem. This paper 
compares two approaches where the structure of the eye diagram is 
considered either as a timing uncertainty or alternatively a vertical 
uncertainty. It shows that only the second view allows accurate BER 
evaluation, even if the eye is closed.



Learn more

http://mailing.emedia-us.com/t/1886112/66375645/6502857/0/?301bfbbf=NTIwODA5Nw%3d%3d&7fb2ef93=NzkyMDA5MQ%3d%3d&e5e2987d=MTg4NjExMg%3d%3d&e5e2987d=MTg4NjExMg%3d%3d&c73c8e04=ZGVuZ24%3d&4f415564=NjYzNzU2NDU%3d&x=85333f3c 








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<td><span style="color: #f5f5f5; font-size: xx-small;">In this issue of Design Engineers Bulletin:<br>Shortfalls of 2D Manufacturing<br />
Can Manual PCB Routing &amp; Automation Coexist?<br />
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<td style="line-height: 18px; padding-right: 10px; font-family: Arial, Helvetica, sans-serif; color: #202020; font-size: 13px;" align="left" 
valign="top">Product development has embraced the benefits of 3D CAD solutions for years. However, many organizations are still using 2D paper 
drawings to convey the information needed for manufacturing. Learn in this white paper the many ways model-based definition (MBD) helps manufacturers. 
<a style="font-family: Arial, Helvetica, sans-serif; color: #202020; font-size: 13px; font-weight: bold; text-decoration: underline;" 
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Issue</strong></td>
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<td style="line-height: 18px; font-family: Arial, Helvetica, sans-serif; color: #202020; font-size: 13px;" align="left" valign="top"> <a 
style="line-height: 18px; font-family: Arial, Helvetica, sans-serif; color: #202020; font-size: 12px; text-decoration: underline;" 
href="http://mailing.emedia-us.com/t/1886112/66375645/6502858/0/?301bfbbf=NTIwODA5Nw%3d%3d&7fb2ef93=NzkyMDA5MQ%3d%3d&e5e2987d=MTg4NjExMg%3d%3d&e5e2987d=MTg4NjExMg%3d%3d&c73c8e04=ZGVuZ24%3d&4f415564=NjYzNzU2NDU%3d&x=019cbf7e" 
target="_blank">Shortfalls of 2D Manufacturing&nbsp;&nbsp;&gt;&gt;</a><br>   <a style="line-height: 18px; font-family: Arial, Helvetica, sans-serif; 
color: #202020; font-size: 12px; text-decoration: underline;" 
href="http://mailing.emedia-us.com/t/1886112/66375645/6502859/0/?301bfbbf=NTIwODA5Nw%3d%3d&7fb2ef93=NzkyMDA5MQ%3d%3d&e5e2987d=MTg4NjExMg%3d%3d&e5e2987d=MTg4NjExMg%3d%3d&c73c8e04=ZGVuZ24%3d&4f415564=NjYzNzU2NDU%3d&x=7862226f" 
target="_blank">Can Manual PCB Routing &amp; Automation Coexist?&nbsp;&nbsp;&gt;&gt;</a><br>  <a style="line-height: 18px; font-family: Arial, 
Helvetica, sans-serif; color: #202020; font-size: 12px; text-decoration: underline;" 
href="http://mailing.emedia-us.com/t/1886112/66375645/6502860/0/?301bfbbf=NTIwODA5Nw%3d%3d&7fb2ef93=NzkyMDA5MQ%3d%3d&e5e2987d=MTg4NjExMg%3d%3d&e5e2987d=MTg4NjExMg%3d%3d&c73c8e04=ZGVuZ24%3d&4f415564=NjYzNzU2NDU%3d&x=544c9a1f" 
target="_blank">DDR4 Design &amp; Signal Integrity Challenges&nbsp;&nbsp;&gt;&gt;</a><br>  <a style="line-height: 18px; font-family: Arial, Helvetica, 
sans-serif; color: #202020; font-size: 12px; text-decoration: underline;" 
href="http://mailing.emedia-us.com/t/1886112/66375645/6502861/0/?301bfbbf=NTIwODA5Nw%3d%3d&7fb2ef93=NzkyMDA5MQ%3d%3d&e5e2987d=MTg4NjExMg%3d%3d&e5e2987d=MTg4NjExMg%3d%3d&c73c8e04=ZGVuZ24%3d&4f415564=NjYzNzU2NDU%3d&x=c388f729" 
target="_blank">Avoiding Reed Relay Problems&nbsp;&nbsp;&gt;&gt;</a><br>  <a style="line-height: 18px; font-family: Arial, Helvetica, sans-serif; 
color: #202020; font-size: 12px; text-decoration: underline;" 
href="http://mailing.emedia-us.com/t/1886112/66375645/6502862/0/?301bfbbf=NTIwODA5Nw%3d%3d&7fb2ef93=NzkyMDA5MQ%3d%3d&e5e2987d=MTg4NjExMg%3d%3d&e5e2987d=MTg4NjExMg%3d%3d&c73c8e04=ZGVuZ24%3d&4f415564=NjYzNzU2NDU%3d&x=54d67113" 
target="_blank">Jitter Noise Duality &amp; Anatomy of an Eye Diagram&nbsp;&nbsp;&gt;&gt;</a><br> </td>
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padding-top: 15px;" align="left" valign="top" bgcolor="#ffffff"><strong><a style="font-weight: bold; text-decoration: underline; font-family: Arial, 
Helvetica, sans-serif; color: #00004e; font-size: 20px;" 
href="http://mailing.emedia-us.com/t/1886112/66375645/6502854/0/?301bfbbf=NTIwODA5Nw%3d%3d&7fb2ef93=NzkyMDA5MQ%3d%3d&e5e2987d=MTg4NjExMg%3d%3d&e5e2987d=MTg4NjExMg%3d%3d&c73c8e04=ZGVuZ24%3d&4f415564=NjYzNzU2NDU%3d&x=0414041d" 
target="_blank">Can Manual PCB Routing &amp; Automation Coexist?</a></strong></td>
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href="http://mailing.emedia-us.com/t/1886112/66375645/6502854/0/?301bfbbf=NTIwODA5Nw%3d%3d&7fb2ef93=NzkyMDA5MQ%3d%3d&e5e2987d=MTg4NjExMg%3d%3d&e5e2987d=MTg4NjExMg%3d%3d&c73c8e04=ZGVuZ24%3d&4f415564=NjYzNzU2NDU%3d&x=0414041d" 
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#202020; font-size: 13px;" align="left" valign="top" bgcolor="#ffffff">Historically, the best design printed circuit boards (PCB) auto-routing success 
is achieved when the design team has taken time to plan, place, constrain and prioritize the design database with auto-routing in mind. This paper 
describes how to enable PCB designers to route high-quality, rule-driven designs quickly and easily with the look and feel of a hand-routed design. <a 
style="font-family: Arial, Helvetica, sans-serif; color: #202020; font-size: 13px; font-weight: bold; text-decoration: underline;" 
href="http://mailing.emedia-us.com/t/1886112/66375645/6502854/0/?301bfbbf=NTIwODA5Nw%3d%3d&7fb2ef93=NzkyMDA5MQ%3d%3d&e5e2987d=MTg4NjExMg%3d%3d&e5e2987d=MTg4NjExMg%3d%3d&c73c8e04=ZGVuZ24%3d&4f415564=NjYzNzU2NDU%3d&x=0414041d" 
target="_blank">Download now</a></td>
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padding-top: 15px;" align="left" valign="top" bgcolor="#ffffff"><strong><a style="font-weight: bold; text-decoration: underline; font-family: Arial, 
Helvetica, sans-serif; color: #00004e; font-size: 20px;" 
href="http://mailing.emedia-us.com/t/1886112/66375645/6502855/0/?301bfbbf=NTIwODA5Nw%3d%3d&7fb2ef93=NzkyMDA5MQ%3d%3d&e5e2987d=MTg4NjExMg%3d%3d&e5e2987d=MTg4NjExMg%3d%3d&c73c8e04=ZGVuZ24%3d&4f415564=NjYzNzU2NDU%3d&x=a90e812d" 
target="_blank">DDR4 Design &amp; Signal Integrity Challenges</a></strong></td>
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src="https://zd-bulletins.s3.amazonaws.com/bulletin/spacer.gif" alt="" width="1" height="10"></td>
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text-decoration: underline;" 
href="http://mailing.emedia-us.com/t/1886112/66375645/6502855/0/?301bfbbf=NTIwODA5Nw%3d%3d&7fb2ef93=NzkyMDA5MQ%3d%3d&e5e2987d=MTg4NjExMg%3d%3d&e5e2987d=MTg4NjExMg%3d%3d&c73c8e04=ZGVuZ24%3d&4f415564=NjYzNzU2NDU%3d&x=a90e812d" 
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#202020; font-size: 13px;" align="left" valign="top" bgcolor="#ffffff">New factors in DDR4, such as an asymmetric termination scheme, data bus 
inversion and signal validation using eye masks require new methods of validating designs through simulation. This paper investigates the effects of 
DDR4&rsquo;s Pseudo Open Drain (POD) driver on data bus signaling and describes methodologies for dynamically calculating the DRAM&rsquo;s internal 
VrefDQ level required for data eye analysis. <a style="font-family: Arial, Helvetica, sans-serif; color: #202020; font-size: 13px; font-weight: bold; 
text-decoration: underline;" 
href="http://mailing.emedia-us.com/t/1886112/66375645/6502855/0/?301bfbbf=NTIwODA5Nw%3d%3d&7fb2ef93=NzkyMDA5MQ%3d%3d&e5e2987d=MTg4NjExMg%3d%3d&e5e2987d=MTg4NjExMg%3d%3d&c73c8e04=ZGVuZ24%3d&4f415564=NjYzNzU2NDU%3d&x=a90e812d" 
target="_blank">Download now</a></td>
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padding-top: 15px;" align="left" valign="top" bgcolor="#ffffff"><strong><a style="font-weight: bold; text-decoration: underline; font-family: Arial, 
Helvetica, sans-serif; color: #00004e; font-size: 20px;" 
href="http://mailing.emedia-us.com/t/1886112/66375645/6502856/0/?301bfbbf=NTIwODA5Nw%3d%3d&7fb2ef93=NzkyMDA5MQ%3d%3d&e5e2987d=MTg4NjExMg%3d%3d&e5e2987d=MTg4NjExMg%3d%3d&c73c8e04=ZGVuZ24%3d&4f415564=NjYzNzU2NDU%3d&x=593c6e83" 
target="_blank">Avoiding Reed Relay Problems</a></strong></td>
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href="http://mailing.emedia-us.com/t/1886112/66375645/6502856/0/?301bfbbf=NTIwODA5Nw%3d%3d&7fb2ef93=NzkyMDA5MQ%3d%3d&e5e2987d=MTg4NjExMg%3d%3d&e5e2987d=MTg4NjExMg%3d%3d&c73c8e04=ZGVuZ24%3d&4f415564=NjYzNzU2NDU%3d&x=593c6e83" 
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#202020; font-size: 13px;" align="left" valign="top" bgcolor="#ffffff">Reed relays are often considered a mundane component by design engineers and 
sometimes little thought is given to the finer points of their specifications. If used correctly, reed relays are very reliable devices. Discover how 
to avoid common problems to greatly enhance the reliability and performance of your designs. <a style="font-family: Arial, Helvetica, sans-serif; 
color: #202020; font-size: 13px; font-weight: bold; text-decoration: underline;" 
href="http://mailing.emedia-us.com/t/1886112/66375645/6502856/0/?301bfbbf=NTIwODA5Nw%3d%3d&7fb2ef93=NzkyMDA5MQ%3d%3d&e5e2987d=MTg4NjExMg%3d%3d&e5e2987d=MTg4NjExMg%3d%3d&c73c8e04=ZGVuZ24%3d&4f415564=NjYzNzU2NDU%3d&x=593c6e83" 
target="_blank">Read now</a></td>
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padding-top: 15px;" align="left" valign="top" bgcolor="#ffffff"><strong><a style="font-weight: bold; text-decoration: underline; font-family: Arial, 
Helvetica, sans-serif; color: #00004e; font-size: 20px;" 
href="http://mailing.emedia-us.com/t/1886112/66375645/6502857/0/?301bfbbf=NTIwODA5Nw%3d%3d&7fb2ef93=NzkyMDA5MQ%3d%3d&e5e2987d=MTg4NjExMg%3d%3d&e5e2987d=MTg4NjExMg%3d%3d&c73c8e04=ZGVuZ24%3d&4f415564=NjYzNzU2NDU%3d&x=85333f3c" 
target="_blank">Jitter Noise Duality &amp; Anatomy of an Eye Diagram</a></strong></td>
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text-decoration: underline;" 
href="http://mailing.emedia-us.com/t/1886112/66375645/6502857/0/?301bfbbf=NTIwODA5Nw%3d%3d&7fb2ef93=NzkyMDA5MQ%3d%3d&e5e2987d=MTg4NjExMg%3d%3d&e5e2987d=MTg4NjExMg%3d%3d&c73c8e04=ZGVuZ24%3d&4f415564=NjYzNzU2NDU%3d&x=85333f3c" 
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#202020; font-size: 13px;" align="left" valign="top" bgcolor="#ffffff">As the technology of serial data transmission has developed there has been 
alternating emphasis on the jitter problem or the noise problem. This paper compares two approaches where the structure of the eye diagram is 
considered either as a timing uncertainty or alternatively a vertical uncertainty. It shows that only the second view allows accurate BER evaluation, 
even if the eye is closed. <a style="font-family: Arial, Helvetica, sans-serif; color: #202020; font-size: 13px; font-weight: bold; text-decoration: 
underline;" 
href="http://mailing.emedia-us.com/t/1886112/66375645/6502857/0/?301bfbbf=NTIwODA5Nw%3d%3d&7fb2ef93=NzkyMDA5MQ%3d%3d&e5e2987d=MTg4NjExMg%3d%3d&e5e2987d=MTg4NjExMg%3d%3d&c73c8e04=ZGVuZ24%3d&4f415564=NjYzNzU2NDU%3d&x=85333f3c" 
target="_blank">Learn more</a></td>
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