248 Threads found on edaboard.com: Layout Extraction
I am trying to do calibre extraction for inverter but i am facing this problem
ERROR: Could not find cell mapping for device nch. Ignoring instance M0.
ERROR: Could not find cell mapping for device pch. Ignoring instance M1.
However the LVS passed successfully, could you please help me in that.
I am using TSMC65n
Analog Integrated Circuit (IC) Design, Layout and Fabrication :: 03-12-2017 07:29 :: mohamed.elgabry :: Replies: 1 :: Views: 898
I'd need more details to recommend the best way (see the section "Best Way to Resize Designs" in the xrc_user manual) but you could try adding "layout USE DATABASE PRECISION YES" to the SVRF rule file. (That is supposed to be the default for xRC and xL if it isn't specified in the rule file. It is possible the foundry has reasons for wanting you t
ASIC Design Methodologies and Tools (Digital) :: 03-10-2017 21:15 :: slizak :: Replies: 1 :: Views: 1207
SPF and DSPF stand for the same thing - its an acronym for "Detailed Standard Parasitic Format".
DSPF (or SPF) file is the output of extraction tool (StarRC, QRC/Quantus, CalibrePEX / XRC, F3D,...) - a text file containing post-layout netlist.
It contains information about design elements (MOSFETs, diodes, BJTs, resistors, capacitors, inductors,...
Analog Integrated Circuit (IC) Design, Layout and Fabrication :: 04-10-2017 17:28 :: timof :: Replies: 5 :: Views: 1712
I am somehow new to ADS 2015.01 and I need some guidance;
1) Do I need a technology file (design kit) for ADS 2015.01 in order to start an RF LC-VCO design?
2)How can I get RF 0.18um CMOS design kit for ADS 2015.01?
3)Is ADS 2015.01 capable of layout and post layout simulation?
4)What is the difference between MOSFET models in A
Analog Integrated Circuit (IC) Design, Layout and Fabrication :: 03-09-2017 08:30 :: hret6288 :: Replies: 3 :: Views: 773
A netlist (Synthesized RTL) is just a text file - so you can edit it in any text editor, including Virtuoso's.
No, you can simulate a layout directly. You need to either extract a netlist from the layout using an extraction tool (or just export the corrsponding netlist from Encounter - although that wont have parasitics)
ASIC Design Methodologies and Tools (Digital) :: 03-02-2017 20:52 :: jbeniston :: Replies: 11 :: Views: 688
I have a designed a layout in SoC encounter based on NangateOpenCellLibrary 45nm. I want to modify the minimum spacing between only two wires of Metal4 to be from 0.14um to 0.07um, so I modified the minimum spacing of Metal 4 layer in LEF tech. file of the used library. If I want to do RC extraction after this modification, should I also modify min
ASIC Design Methodologies and Tools (Digital) :: 03-02-2017 11:59 :: oAwad :: Replies: 1 :: Views: 506
When designing a layout in SoC encounter, can the presence or absence of power stripes affect the timing delay of the circuit ?
Yes and no.
Even without power rails, encounter will assume the cells are being powered up. Timing would change if the actual wires were there, mostly because of coupling and possi
ASIC Design Methodologies and Tools (Digital) :: 02-19-2017 17:54 :: ThisIsNotSam :: Replies: 2 :: Views: 520
Thanks for your reply
When a draw an extra wire, it is assigned to the net next to it. I want to a assign a new net for it (which is not included in the netlist) so in order to be able to measure the crosstalk between two different nets.
My layout is an AES encryption core of 27332 gates. So what is the best RC extracti
ASIC Design Methodologies and Tools (Digital) :: 02-17-2017 14:33 :: ThisIsNotSam :: Replies: 3 :: Views: 461
when I flat the inductor it gives LVS error.
Sure. As I told you above: you should try and take over the extracted parasitics (from the extracted layout view) into your schematic view.
As long as your inductor cell isn't yet flattened, you might be able to simply copy its extracted layout (i.e. its back
Analog Integrated Circuit (IC) Design, Layout and Fabrication :: 12-29-2016 19:57 :: erikl :: Replies: 7 :: Views: 871
You might need to do some extra work such as adding
whatever recognition / special layers the foundry PDK
uses to drive recognition & param extraction of drawn
inductors. These would be absent from an externally
sourced layout since that's all "housekeeping" inside
the Cadence setup.
I'd begin with making an intra-Cadence spiral inductor (...)
Analog Circuit Design :: 12-21-2016 18:18 :: dick_freebird :: Replies: 2 :: Views: 769
This is a standard DSPF (Detailed Standard Parasitic Format) file format.
It is usually generated by extraction tools (StarRC, QRC, Calibre PEX, F3D, etc.), and contains parasitic elements (R, C, L. K,...) and design elements/instances (transistors, capacitors, etc.) along with their layout-dependent parameters.
DSPF (also sometimes called SPF) fi
Analog Integrated Circuit (IC) Design, Layout and Fabrication :: 11-13-2016 02:08 :: timof :: Replies: 5 :: Views: 1791
RCbest, RCworst, Cbest, Cmin... corner analyses use the corresponding values from possible process variations. Together with min. and max. supply voltage and temperature you can use these values to analyze the PVT limits of your circuit behavior before layout (pre-layout simulations).
Post-layout extraction will addi
Analog Integrated Circuit (IC) Design, Layout and Fabrication :: 06-17-2016 20:29 :: erikl :: Replies: 8 :: Views: 1172
I am doing a post-layout extraction and i have noticed my GBW drops significantly from 200kHz to 100kHz due to large amount of parasitic caps coming from my >2k distributed poly resistor segments.
I partially chop my error amplifier (structure: nmos input pair, folded cascode and miller-compensated 2nd stage). I only chop the current sou
Analog Integrated Circuit (IC) Design, Layout and Fabrication :: 05-15-2016 07:03 :: gujaratibhai :: Replies: 1 :: Views: 1020
I am having trouble running QRC. I am currently using Cadence Virtuoso 6.1.6 with FreePDK3D45. I am trying to do the extraction from the layout. I got the following error:
*Error* eval: undefined function - _vfoIsAdvancedNodeEnabled
*WARNING* Technology must be specified!
ERROR (LBRCXM-644): Bad return status from RCX script gener
Software Problems, Hints and Reviews :: 04-10-2016 01:02 :: Reema_A :: Replies: 0 :: Views: 971
Make a trivial schematic with at least one pin and one
wire. There's your metal schematic. Put the same pin
name on your 1-square layout. See if you can get the
analog extraction to complete with such a trivial case,
you may need to work with pruning of useless nets and
Or, make a slightly more real layout & schematic with (...)
Analog Integrated Circuit (IC) Design, Layout and Fabrication :: 03-21-2016 23:18 :: dick_freebird :: Replies: 1 :: Views: 513
I am using clibre for pex. I want to avoid double extraction of rf models e.g. nfet_rf
I have declared xcell file as follows:
The problem is when I use Outputs>Get net names from schematic, this does not work and double extraction happens.
When I use get names from layout, it works but my cellmap gives me (...)
Analog Integrated Circuit (IC) Design, Layout and Fabrication :: 02-12-2016 05:54 :: analog_chip :: Replies: 0 :: Views: 804
I think inductance will come in picture when metal winding is more , meance round shape metal for ex. M1 to M5.
In layout will draw metal as straight for routing purpose, there inductance is negligible.
ASIC Design Methodologies and Tools (Digital) :: 02-10-2016 07:19 :: khotkar :: Replies: 4 :: Views: 763
I'm a rtl engineer. I'm confused between the difference of sdf and spf back annotation. As I know sdf came from STA( PT) and SPF came from STAR-RC. So In my experiance, the sdf used to timing close the netlist without RC elements. then this netlist to send a PNR team. After extraction RC elements in layout team by starRC. Then finally we once again
ASIC Design Methodologies and Tools (Digital) :: 12-31-2015 02:22 :: u24c02 :: Replies: 5 :: Views: 847
Going by the name RCmin : means minimum C and corresponding R. Once you set Cmin extraction the tool gets the corresponding data for R.
You can also have extraction RmaxC where R is maximum and the corresponding R. This is coded up in the tech files provided by the foundry. The spf numbers are dependant on the layout, metal width and cap (...)
ASIC Design Methodologies and Tools (Digital) :: 10-27-2015 22:01 :: artmalik :: Replies: 1 :: Views: 981
I am new on this forum and relatively new on analog design.
I finished layout design of my low-voltage current mirror (100:1). I used 2D common centroid for better matching. After extraction spectre gave me Vth=335mV (346mV in schematic) for my unity MOSFET TN3. Everything else is same.
What is mechanism behind this lowering?
Analog Integrated Circuit (IC) Design, Layout and Fabrication :: 07-19-2015 17:50 :: cira529 :: Replies: 2 :: Views: 791