15 Threads found on edaboard.com: Nmos Inverter Layout
Designed one layout of CMOS inverter in L'edit software. Its extract file showed three Parasitic Capacitors and the last capacitor was between the VSS and 0 (VSS = Drain of nmos). Wanted to know how to use this capacitor which is between VSS and GND??
PCB Routing Schematic Layout software and Simulation :: 08-28-2014 13:28 :: prakhars :: Replies: 0 :: Views: 333
The right one (nmos with 2 fingers, too) is the better layout: less input gate series resistance, less parasitic output capacitance, and saves real estate area.
Analog IC Design and Layout :: 06-26-2014 08:00 :: erikl :: Replies: 2 :: Views: 249
You can find the minimum width of pmos and nmos by designing a inverter whose switching point is middle of your supply voltage and
Make sure the width of the Mos has atleast two contacts in the layout... it is useful for the designing..
Analog IC Design and Layout :: 10-18-2013 02:03 :: kenambo :: Replies: 2 :: Views: 351
Actually this error message is rather self-explaining: you need a p+ diffusion area ("Psub tap") close (<= 10.0 um) to the n+ source (and drain) areas of the nmos. Connect this Psub tap via contact and metal_1 to GND (like your nmos source, probably). See e.g. this inverter layout from a Cādence tutorial:
Analog IC Design and Layout :: 10-15-2013 10:15 :: erikl :: Replies: 3 :: Views: 927
I have circuit in CADENCE, in which I use a cmos inverter with 5 finger for pmos and 4 finger for nmos. I have another PMOS in the same design with 10 fingers. When I do the LVS, it fails because it can not relate the inverter in the layout to the inverter in the schematic. and says the instance is (...)
Analog IC Design and Layout :: 10-10-2012 14:36 :: engrMunna :: Replies: 2 :: Views: 672
I am new with the layout. I finished a tutorial of layouting an inverter. Now I am doing a layout for a very simple circuit (1*nmos + 1*cap). I got 2 errors from the DRC (with switch of "no_coverage ") which are:
Figure Causing Multiple Stamped Connections.
Figure Having Multiple Stamped (...)
Analog IC Design and Layout :: 11-22-2010 08:00 :: dsj_guilin :: Replies: 2 :: Views: 834
you just draw your PMOS and nmos on schematics symbols and then transfer it to layout using stick diagram. =) It is the same.. XD
---------- Post added at 04:13 ---------- Previous post was at 04:08 ----------
Your nmos gate will be conncted to your PMOS gate. Your Source of PMOS to +ve Power supply, Source
Analog IC Design and Layout :: 10-20-2010 00:13 :: john blue :: Replies: 6 :: Views: 677
If I have a inverter connected directly my pad, then how do I layout this inverter protecting from ESD and Latch Up issues ? please explain in details.
consider for example W/L of PMOS = 200/0.5 amd W/L of nmos = 75/0.5.
Analog IC Design and Layout :: 10-13-2010 02:15 :: krrao :: Replies: 3 :: Views: 1600
The easiest way is to open Virtuoso from Composer window. Tools-> Design Synthesis -> layout XL. Then from layout XL got to Design -> Gen from source. Lets say you have an inverter in the Schematic window. After you do Gen from source it will place 1 nmos and 1 PMOS and all i/o pins. Press shift f to get the (...)
Analog IC Design and Layout :: 05-13-2010 03:31 :: Vabzter :: Replies: 1 :: Views: 666
i have designed an inverter (5 pmos, 2 nmos), and their gates connect together. but when i run calibre PEX, it says that, there are two gates not connected, floating gate, but i connect them together indeed, and LVS is OK. why? it is very strange, has anyone met this problem before? pls help me. thanks.
Analog Circuit Design :: 01-12-2010 07:46 :: lhlbluesky :: Replies: 4 :: Views: 802
they won't work....
Vgs needs to have a certain positive value for the nmos to work...and if the transistor drain is connected to Vdd and its source is connected to the output, then the voltage on the source is unknown and the value of Vgs isn't necessarily the voltage needed for the correct operation of the it won't work :)
Analog IC Design and Layout :: 03-06-2008 08:44 :: salma ali bakr :: Replies: 5 :: Views: 1353
I've seen one 1.2um project inverter
Analog Circuit Design :: 10-10-2007 05:04 :: Alan_Nesta :: Replies: 8 :: Views: 1341
I am layout the output buffer whcih drive a ~10pF load cap at 80MHz. The output buffer size is for PMOS 12/0.6,m=40 and for nmos,it is 12/0.6, m=20. The max size of the W in my process is limited to Wmax=20.
Anyone can see any risk for selction the multiple number is high to 40 for PMOS and 20 for nmos?
Thanks in adavnce for (...)
Analog IC Design and Layout :: 09-18-2006 02:33 :: chang830 :: Replies: 1 :: Views: 682
Our ciruit used a big inveretr as buffer to drive a ~10pF load cap to CMOS level. The working frequency is 155Mbps.The size of the inveretr is for PMOS 12/0.6,m=40 and for nmos,it is 12/0.6mm=20. The process is 0.6um CMOS.
We feel puzzled for how to draw it in layout. There are two main problems.
One is how to place the input and output
Analog IC Design and Layout :: 09-13-2006 23:39 :: chang830 :: Replies: 0 :: Views: 668
I have a question to lay, because I don't know how full custom EDA tools recognise devices...
when I design a inverter or a nmos layout, how IC cadence system recognise that my
layout is a inverter or a nmos and how IC tool assign device characteristics, parassitic parameters, etc... (...)
ASIC Design Methodologies and Tools (Digital) :: 03-31-2006 14:07 :: OvErFlO :: Replies: 0 :: Views: 591