Continue to Site

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.

Register Log in

draw the guard ring or use it from the transistor directly?

Status
Not open for further replies.
K

katrin

Full Member level 1
Joined
Dec 3, 2005
Messages
98
Helped
1
Reputation
2
Reaction score
1
Trophy points
1,288
Activity points
2,200
I have one question about guard ring.

I can either draw the guard ring by hand or add the guard ring automaticly for each side from transistors' properity.

When I draw the guard ring by hand, just add each layer manually, it is more time-consuming, but it is more flexible. I can leave some small opens for wiring.

The problem with automatic guard ring is that there is no open around the transistors for wiring. So I can only use one or two sides automatic guard ring.

I am wondering usually do people draw the guard ring manually or do you just use the automatic guard ring?

thanks
 

I have the same question about guard ring opening for wiring...
 

For Virtuosso I created ROD and use that.
Because sometimes I need to surround 2, 3 or more transistors by the same guard ring
 

in general for RF or sensitive devices I would recommend to use guardring / substrate tie for each device. But since each of those cost area you do not have to surround them alway - it's enough to let say have a well/sub tie as a stripe above/bellow devices and surround blocks with guardrings.
 

    K

    katrin

    Points: 2
    Helpful Answer Positive Rating
Re: draw the guard ring or use it from the transistor direct

katrin said:
I have one question about guard ring.

I can either draw the guard ring by hand or add the guard ring automaticly for each side from transistors' properity.

When I draw the guard ring by hand, just add each layer manually, it is more time-consuming, but it is more flexible. I can leave some small opens for wiring.

The problem with automatic guard ring is that there is no open around the transistors for wiring. So I can only use one or two sides automatic guard ring.

I am wondering usually do people draw the guard ring manually or do you just use the automatic guard ring?

thanks
Click to expand...

hey Katrin

U can do either ways whatever is more convinient and less time consuming. I usually draw the same irrespective of small / large blocks, i find it more flexible.

Regards
Brittoo
 

    K

    katrin

    Points: 2
    Helpful Answer Positive Rating
Hi Katrin,

What I normally do is to put all the same type of transistors with the same bulk connection and surround it with a full double guardring to be safe and you can use metal2 or higher for device interconnections.
 

    K

    katrin

    Points: 2
    Helpful Answer Positive Rating
Re: draw the guard ring or use it from the transistor direct

Yes, ROD is quite convenient for guardring.

Fom said:
For Virtuosso I created ROD and use that.
Because sometimes I need to surround 2, 3 or more transistors by the same guard ring
Click to expand...
 

    K

    katrin

    Points: 2
    Helpful Answer Positive Rating
Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top