Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronic 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.

Register Log in

shielding from substrate noise

Status
Not open for further replies.

swathi0356

Junior Member level 1
Joined
Dec 13, 2005
Messages
15
Helped
2
Reputation
4
Reaction score
0
Trophy points
1,281
Activity points
1,441
how shielding is made from substrate noise.how the resistance of the substrate can be reduced.
thank you every one.
 

vbhupendra

Full Member level 4
Joined
May 11, 2005
Messages
235
Helped
15
Reputation
30
Reaction score
8
Trophy points
1,298
Location
GOA, INDIA
Activity points
3,219
place gnd lines on the two sides of the signal; forcing most of the e.f. lines emanating from the noisy lines to terminate on gnd rather on signal.
 

muralikrishma

Newbie level 2
Joined
Dec 22, 2005
Messages
2
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,281
Activity points
1,314
guard ring is something that protects from substrate noise. In case of p substrate then put a p+ diffusion surrounding the active and connect it to VDD .

In case of N well,, put N+ guard ring surrounding the active and connect it to the Ground or lowest possible potential.


This protects the active from Substrate noise.

May be some more techniques also........
 

YESH_23

Member level 4
Joined
Dec 20, 2005
Messages
78
Helped
8
Reputation
16
Reaction score
4
Trophy points
1,288
Location
INDIA
Activity points
1,951
substrate resistence will be the same but another layer which is less resistive than substrate is connected to substrate and then tied on the other side to vdd or gnd

so that any noise i.e unwanted currents will flom from the substrate to vdd or gnd through the low resistive path known as gaurd ring

in this way sheilding is made from substrate noise
 

BigBoss

Advanced Member level 5
Joined
Nov 17, 2001
Messages
4,969
Helped
1,502
Reputation
3,002
Reaction score
1,341
Trophy points
1,393
Location
Turkey
Activity points
29,963
It's not essentially possible to reduce substrate intrinsic resistance but connection and via resistances.

Second, to reduce substarte noises (many type of noise I mean ) it's possible to use BNTAP that is inserted buried layers in substarte and to use BN rings around noisy circuits and also TRENCH layers to isolate the circuits. In fact all depends on your technolgy because some of them may not be available in your technolgy.

So, every specific problem has specific solution, so there is no universal solution here..
 

Status
Not open for further replies.

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Top