Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Will Positive Skew Improves frequency or decrease frequency

Status
Not open for further replies.

kunal1514

Full Member level 1
Joined
Dec 13, 2006
Messages
98
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,286
Activity points
2,027
positive skew

Hi All,

Will Positive Skew Improves frequency or decrease frequency.
 

wice

Member level 1
Joined
Dec 30, 2006
Messages
33
Helped
6
Reputation
12
Reaction score
2
Trophy points
1,288
Activity points
1,513
positive skew clock frequency

sometimes Positive Skew can alleviate setup violation caused by long delay.
if setup violation is the main problem you have to fix ,then you can utilize Positive Skew to Improve frequency ,but Positive Skew can put pressure on hold time. hold time problems will comes up when you have too big Positive Skew.
fortunately, slight hold violation can be fixed at the backend when clock tree is generated.
 

lakshman.ar

Member level 5
Joined
Nov 29, 2006
Messages
88
Helped
12
Reputation
24
Reaction score
4
Trophy points
1,288
Location
Bangalore
Activity points
1,849
skew + setup + frequency

postive skew of the clock implies a delayed clock !
therfore +ve skew decreases the frequency .

I agree with "wice", to the point that

1) positive skew improves your setup margin, but degrades ur hold margin !

2) a small hold margin of hold violation can be fixed at the backend, when the CTS is performed !!

WBR,
Lakshman
 

nikhilindia85

Member level 4
Joined
Feb 28, 2007
Messages
78
Helped
3
Reputation
6
Reaction score
3
Trophy points
1,288
Activity points
1,712
positive skew frequency

possitive skew decreases freq
tclk>tc-q+tcomb+tsetup-tskew
 

itsthepip

Member level 1
Joined
Oct 24, 2006
Messages
33
Helped
8
Reputation
16
Reaction score
0
Trophy points
1,286
Activity points
1,435
frequency decrease skew

Positive skew is sometimes helpful to us
It decreases the minimum clock period and increases the max clock frequency of operation
 

KASILANKA VISWANADH BABU

Newbie level 3
Joined
Aug 8, 2007
Messages
4
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,281
Activity points
1,306
Re: Will Positive Skew Improves frequency or decrease freque

Hi,

SKEW is indepent of frequency.

+ve or -ve skew does not effect it.
Skew will alter the arrival time of clock edge but it will not alter the time period .
Hence, skew is independent of frequency

vissu
 

alam.tauqueer

Full Member level 2
Joined
Jun 19, 2007
Messages
128
Helped
5
Reputation
10
Reaction score
2
Trophy points
1,298
Activity points
2,005
skew is independent of frequency but in case of +ve skew arrival time of clock edge will delayed ,it means if we increase the frequency of clock we can meet the setuo and hold time,

Indirectly we can say tha frequency can increase.similarly in case of -ve skew frequency cab be decreased.
 

Status
Not open for further replies.

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Top