Errors when extracting DAC layout

[bgpradeep]

Hi All,

I am building the layout of DAC and got some errors while extracting like
short circuit.

In the floorplan attached the THERMOMETER DECODER has output from
T00 - T062 while the input of SWATCH ARRAY is INN00 - INN062 and inside the SWATCH ARRAY each SWATCH cell has INN.

The error it gave was:

Short circuit - Different names on one net:

(1) name "INN" at location -----
(2) name "INN62" at location ----
(3) name "TB062" at location ----

the name "INN" was assigned to the net.


Here, INN which is a port in individual SWATCH cell should be connected to the port INN62 (SWATCH ARRAY port) and INN62 is in turn connected to TB062(THERMOMETER DECODER output). I did not get how this connection can
create short circuit because its a direct connection and no other metal layer crosses it . Should these names be same or different named ports connected together will make any difference.

Can anyone help me to sort this out.

Thanks
Pradeep

 

[tbksandeep]

Re: HELP REGARDING DAC

hello is this the current steering project?
if so i need help tooooooo

 

[bgpradeep]

Re: HELP REGARDING DAC

Yes, i am implementing a current steering architecture

 

[tbksandeep]

Re: HELP REGARDING DAC

god
can u tell me wat is current steering in LAY man language and can u give me the schematic for that or else can u tell me as where to get it

 

[franck]

Re: HELP REGARDING DAC

Hi,

Which tool are you using?
Try to run a flat LVS.

Franck.

 

[tbksandeep]

Re: HELP REGARDING DAC

we are using cadence.I read so many papers on it but iam not getting an idea as what is current steering?i want some schematic circuit on it.can some one help me on it?

 

[wsy979]

Re: HELP REGARDING DAC

we are using cadence.I read so many papers on it but iam not getting an idea as what is current steering?i want some schematic circuit on it.can some one help me on it?

try to refer book on principle of data converters
such as Razavi's "principles of data converter system design" , chapter 4

hope it helps

regards

 

[tbksandeep]

Re: HELP REGARDING DAC

ok do we have this book somewhere in the fourm of the eboard?