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.

What are the effects of using low Vt devices?

Status
Not open for further replies.

Resistance

Member level 4
Joined
Dec 24, 2005
Messages
74
Helped
5
Reputation
10
Reaction score
2
Trophy points
1,288
Activity points
2,034
Effects of low Vt..

Hi,

I want to know all the efects of using low Vt devices.. Y specifically Dual vt devices are preferred ..

explain.

regards
 

anjali

Full Member level 3
Joined
Aug 16, 2005
Messages
173
Helped
14
Reputation
28
Reaction score
6
Trophy points
1,298
Activity points
3,033
Re: Effects of low Vt..

less noise margin
 

johnz

Member level 1
Joined
Jul 16, 2005
Messages
38
Helped
3
Reputation
6
Reaction score
1
Trophy points
1,288
Activity points
1,611
Re: Effects of low Vt..

0.13um technology and technology under 0.13um have bigger percentage of leakage power. multiple Vt std library( low, normal, high Vt) are used for reducing leakage power .

They have same area.

low Vt ( fast, bigger leakage) , high Vt ( slow, smaller leakage)
 

silencer3

Advanced Member level 4
Joined
Jun 3, 2003
Messages
112
Helped
17
Reputation
34
Reaction score
11
Trophy points
1,298
Activity points
1,057
Effects of low Vt..

i agree with johnz.

below 0.13um or even at 0.13um, leakage power is a significant thing to consider as it is not just about power but also about timing, thermal, noise..etc.

now a days it is better to first synthesize design using HIGH Vt library and replace the timing critical paths with LOW Vt cells to meet timings. This ensures a better power design with required speed.
 

Nimer

Full Member level 3
Joined
Apr 26, 2005
Messages
180
Helped
26
Reputation
52
Reaction score
8
Trophy points
1,298
Location
PALISTINE
Activity points
2,907
Re: Effects of low Vt..

hi

sorry for the intrusion, but wht is Vt ???
 

manu_leo

Member level 1
Joined
Dec 1, 2005
Messages
40
Helped
3
Reputation
6
Reaction score
3
Trophy points
1,288
Location
bangalore
Activity points
1,573
Re: Effects of low Vt..

Vt is threshold voltage for CMOS. Low Vt cause more leakage
 

elecs_gene

Member level 2
Joined
Dec 20, 2005
Messages
52
Helped
3
Reputation
6
Reaction score
1
Trophy points
1,288
Activity points
1,797
Re: Effects of low Vt..

hi guys
which one has higher power dissipation-low or high Vt????could u explain in detail..
could u compare the leakage,static and dynamic dissipation in all these ???

regards
 

electronics_kumar

Advanced Member level 2
Joined
Nov 29, 2004
Messages
659
Helped
34
Reputation
68
Reaction score
9
Trophy points
1,298
Location
Tamilnadu
Activity points
5,552
Re: Effects of low Vt..

low Vt will have less power dissipation whereas high Vt will have more power dissipation
 

Nandy

Advanced Member level 4
Joined
Dec 16, 2005
Messages
116
Helped
6
Reputation
12
Reaction score
4
Trophy points
1,298
Location
San Jose CA
Activity points
2,399
Effects of low Vt..

One interesting thing is, the dynamic power consumption (running time) maybe no difference between low/high VT. The reason is High VT is slower and has longer transition time which uses more power.

Nandy
www.nandigits.com
Netlist Debug/ECO in GUI mode.
 

Resistance

Member level 4
Joined
Dec 24, 2005
Messages
74
Helped
5
Reputation
10
Reaction score
2
Trophy points
1,288
Activity points
2,034
Re: Effects of low Vt..

hi ,

Now can any of u explain clearly wat makes a low vt device fast and dissipate more power... then which factor changes :

Static or Leakage????
Tell me rules of thumb how they differ.

Elaborate answer please


regards

Added after 1 minutes:

hi anjali,

Wat does Dual Vt got to dom with noise margin..

please elaborate
 

erich123

Junior Member level 1
Joined
Dec 20, 2005
Messages
17
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,281
Activity points
1,410
Re: Effects of low Vt..

=============================================
One interesting thing is, the dynamic power consumption (running time) maybe no difference between low/high VT. The reason is High VT is slower and has longer transition time which uses more power.

Nandy
==============================================

Hi Handy,

You words sounds reasonable, but I don't think your explaination is right, we use High VT mainly for leakage reduction, it is not dynamic power. What do you think?
 

Status
Not open for further replies.

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Top