Embedded Systems Conference
Breaking News
Comments
Wnderer
User Rank
Author
Grids not as important anymore
Wnderer   5/22/2014 11:23:52 AM
NO RATINGS
I think radial grids have been around for a long time. I recall a board done on the old Calay CAD that ran on the PDP11 that had to fit in the nose cone of an airplane that I think had parts laid out on a radial grid. The problem with radial grids was meshing them with the square grid.

In the old days grids were important. There was no automated spacing checking. The spacing was calculated by the grids you used. The boards would be laid out 8, 8 and 8 or 8 mil traces and 8 mil spaces on an 8 mil grid. By placing the 8 mil traces on the next grid that didn't contact the trace next to it, you would get the 8 mil spacing. If you laid out part of the board radially some of the pads wouldn't fall on the 8 mil grid and maintaining the spacing requirements would be difficult.

Today I switch grids while laying out a board all the time. The software maintains the spacing and checks for errors.

Max The Magnificent
User Rank
Author
Re: Grids not as important anymore
Max The Magnificent   5/22/2014 11:32:04 AM
NO RATINGS
@Wnderer: I think radial grids have been around for a long time...

That may well be -- and it seems as though they are in a lot of today's tools -- the surporising thing is how few of us know this capability exists.

xjordanx_#1
User Rank
Author
Re: Grids not as important anymore
xjordanx_#1   5/22/2014 7:28:30 PM
NO RATINGS
I remember first using radial grids in AutoCAD, but not for PCB design of course.

 

Then the problem was you had to switch between them - you couldn't mix, match and prioritize, and nor could you set the origin of multiple different grids or offset their rotation.

 

I suppose it's just one of those things that most ofthe time you wouldn't need it, but then that one time you do, if it's not there, you're basically up the creek without a paddle.

 

It was sure a big time saver for my stroboscope.



Radio
LATEST ARCHIVED BROADCAST
As data rates begin to move beyond 25 Gbps channels, new problems arise. Getting to 50 Gbps channels might not be possible with the traditional NRZ (2-level) signaling. PAM4 lets data rates double with only a small increase in channel bandwidth by sending two bits per symbol. But, it brings new measurement and analysis problems. Signal integrity sage Ransom Stephens will explain how PAM4 differs from NRZ and what to expect in design, measurement, and signal analysis.

Datasheets.com Parts Search

185 million searchable parts
(please enter a part number or hit search to begin)
Like Us on Facebook
Special Video Section
The LTC®6363 is a low power, low noise, fully differential ...
Vincent Ching, applications engineer at Avago Technologies, ...
The LT®6375 is a unity-gain difference amplifier which ...
The LTC®4015 is a complete synchronous buck controller/ ...
10:35
The LTC®2983 measures a wide variety of temperature sensors ...
The LTC®3886 is a dual PolyPhase DC/DC synchronous ...
The LTC®2348-18 is an 18-bit, low noise 8-channel ...
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 ...