Embedded Systems Conference
Breaking News
Newest First | Oldest First | Threaded View
Daniel Payne
User Rank
Daniel Payne   9/6/2014 8:21:55 PM
In the second paragraph there's a typo, "cost-layout" should be instead "post-layout".

User Rank
Re: corners aren't everything
resistion   8/18/2014 8:01:41 AM
Controlling both the overlay and the CD between exposures is extremely difficult. So SADP might be better to control, if you can correct for the sidewall distance after exposure.

User Rank
corners aren't everything
jeremybirch   8/18/2014 6:49:40 AM
Corners can be used to check that a design performs to speed under a variety of production and use variations whilst not exhibiting nasty side-effects - for instance steps that might speed up a design might also risk shoot-through on short paths. Statistical analysis can look a little deeper to look for bad scenarios that happen away from the extreme corners.

But the problem with multi-patterning is that the errors are highly correlated ie all copies of a given geometry might be shifted to the left and hence all of those nodes might have an increased capacitance whereas all copies of another node might have lowered capacitance (assuming all the cells coloured the same way). This may introduce a bad skew particularly if one node is a clock and the other a critical signal that it gates. Alternately every copy of a given cell might be coloured independently (if the EDA tool allows this) and hence some nodes will be faster and some slower. Corners don't really model this.

Worst of all is for two cells that are meant to be matched (eg analogue cells, sense amps etc) but in the colourings are the opposite of each other, this will mean that a mask offset will have opposite effects in the two cells and hence cause a big mismatch. Again just using corners will not spot this, and using monte carlo simulation will only spot a sensitivity to the possibility of this happening rather than the certainty caused by a colouring mismatch.

User Rank
know the rules
TanjB   8/17/2014 9:12:41 PM
Seems like if the foundry has control over the multi-patterning, and their choices impact the margins, then the only sane solution is for them to expose the rule deck.

Yes you can work around it but then you are adding slack to your design if you have uncertainty on what the actual pattern will be and so need margins in multiple places, only some of which will actually be needed.  As if things were not tight enough already...

Would this be an advantage for the few, like Samsung or Intel, with their own fabs (or others with privileged relations to a fab) and rules completely integrated into their tool sets?

User Rank
uneven spaces
resistion   8/15/2014 10:35:46 PM
This article must refer to LELE. With SADP, there's some relief but process must ensure adjacent spaces are (targeted to be) equal.

NASA's Orion Flight Software Production Systems Manager Darrel G. Raines joins Planet Analog Editor Steve Taranovich and Embedded.com Editor Max Maxfield to talk about embedded flight software used on the Mars on EE Times Radio. Live radio show and live chat. Get your questions ready.
Top Comments of the Week
Like Us on Facebook

Datasheets.com Parts Search

185 million searchable parts
(please enter a part number or hit search to begin)
Special Video Section
The LTC®4015 is a complete synchronous buck controller/ ...
The LTC®2983 measures a wide variety of temperature sensors ...
The LTC®3886 is a dual PolyPhase DC/DC synchronous ...
The LT®3042 is a high performance low dropout linear ...
Chwan-Jye Foo (C.J Foo), product marketing manager for ...
The LT®3752/LT3752-1 are current mode PWM controllers ...
LED lighting is an important feature in today’s and future ...
Active balancing of series connected battery stacks exists ...
After a four-year absence, Infineon returns to Mobile World ...
A laptop’s 65-watt adapter can be made 6 times smaller and ...
An industry network should have device and data security at ...
The LTC2975 is a four-channel PMBus Power System Manager ...
In this video, a new high speed CMOS output comparator ...
The LT8640 is a 42V, 5A synchronous step-down regulator ...
The LTC2000 high-speed DAC has low noise and excellent ...
How do you protect the load and ensure output continues to ...
General-purpose DACs have applications in instrumentation, ...
Linear Technology demonstrates its latest measurement ...
Demos from Maxim Integrated at Electronica 2014 show ...
Bosch CEO Stefan Finkbeiner shows off latest combo and ...