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I am drawing a layout of an inverter in cadence virtuoso layout XL. The problem is there are two layers visible in P MOS one is n well draw and other one is n well pin. and by default it (n well pin) is showing connection to VDD. As a result of this when I tried to connect the out, it is showing short circuit with vdd. I dont know how to (...)
CPAR probably denotes parasitic capacitance from the layout, hand-annotated to the schematic for simulation realism. It's implemented by the act of wiring stuff up. M1-M6 look like MOS capacitors, to slow down that inverter's output edges (usually done to add a crude delay, although the purpose of -that- is not clear offhand).
Would this gds layout (inverter) work for you?: Note that layer thicknesses is not a part of GDS format, that info comes from technology file (ITF / ICT / iRCX / ...).
Stray inductance in the layout and load capacitance may cause unexpected results. As FVM indicated the Coss ( and CISS) is very nonlinear with voltage , judging by the Q vs Vgs A good ground plane is essential. I agree with the problems with 10:1 load range and PFM may be better than PWM which is more common for boost converters.
You would be best off to ignore the min area errors after determining that each of them will be fixed by attaching the block usefully. This is generally the case, but wants inspection. In some technologies a minimum via and its surround will violate min area and then someone using your cell will find their own min-area errors in your data levels i
You need to scroll back further and address any complaints about libraries not found, failure of extract process, etc. I see some complaints about not being able to find what look like basic PDK library primitives, maybe your library setup is not making it to the verification tool's setup or something like that. Technology file needs attached to
Hello all, I have an issue with LVS. I am trying to implement a 4 bit 1's compliment circuit. So this has just 4 inverters in the schematics and I have used the same in the layout(four instances of inverter layout).With pins added properly I cannot get LVS netlist the si.out file I see that the termbad.out there are some (...)
The size will fall out of optimization for whatever it is that you care about. We do not know what that is. Maybe you care about propagation delay, or not. Maybe you care about clock feedthrough or charge injection. Maybe you only care about minimum layout area. Transistors have properties, you fiddle them around until you understand, then unt
I made a small, 1A, inverter to drive standard small induction motors. Read details here. Schematics, PCB layout and demo software are available. The inverter is supplied by 230VAC, Uses IRF840 MOSFETs, PWM is at 15kHz, is pretty elementary and... is easy to build at home. It
as we know a buffer is made of two inverter ,but why the two inverter are created as same in the layout???
I want to simulate some layout in ADS and sweep the coupling coefficient value J12 VS. length of resonator such as below figure. How can I obtain it?
A schematic and BOM would show more details with layout photo. Commutation noise is greatly affected by ESR of source Caps, Switched Caps and effective load impedance with transients from dead-time inductive currents.
Dear all, I just want to understand, how to find CL? Because for sizing CMOS inverter you always need to know load capacitance, but in real layout or schematic you don't have any capacitance instance. I have one idea, maybe it's a parasitics capacitance, but how I can find it, from PDK? Regards, Vadim
hello, i'm new with analog design with this pack of ibm and i have a trouble that i can't solve. I'm doing a simple inverter with Mentor Graphics in this technology and in the schematic i put the subc for the NMOS, but i don't have a contact for the substrate of the PMOS, and when i do the DRC, this is an error message that shows up, i prove to
You can also add a snubber circuit near to each switching device. This will reduce the peak current flowing inside during opening period. Another possibility, but it's kind of hard to evaluate without a notion either of the waveform or the board layout, is that the transistor base is receiving induced noise, which could cause undesired DC drivi
Hello, I am facing a problem while doing a post layout simulation of a simple inverter chain.I ran a transient analysis on current through voltage supply node(minus terminal) with an intention to know the current flowing through the circuit at different instant of time. Below is my Test Bench circuit. 110156 Unf
Read Alan Hastings "The art of analog layout".
Where - i.e. from which tool - didn't you get correct results? Simulation, layout creation, or Dracula LVS? May be the used tool doesn't (yet) know - or cannot assign - these Finfet parameters.
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??
I have the skill file for the layout of a simple inverter chain. Do anybody have any idea how to do the DRC, LVS checks for the layout and thereby do the extraction followed by post layout simulation to get the AC response through a script?? There are ways to get the ac responses for schematics from OCEAN scripts. So is it (...)
Hello all. I finished my layout for an inverter a couple of hours ago and ran DRC and LVS with no errors (they were successful). I then needed to make a layout for an xor gate which used two inverters. After I used the "pick from schematic" option, I instantly ran a DRC check, which then gave 228 "Edge not on grid" errors. (...)
hi, 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.. Thanks...
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: 97294
Changing the MOSFET won't help. The ferrite might. Board layout also can contribute to the ringing.
What you are trying to do is called reverse engineering. You have to draw schematics after studing board and then draw layout with component placement. Then study the board behavior with different inputs and evaluate the timing and wave shapes of different outputs. Evaluate working flow and block diagram the try to code the mcu.Sometimes it is easy
Hello, I keep getting the above error when attempting to run Assura DRC on a simple layout of an inverter. I am using IBM 90nm technology. Additionally, here are some of the errors in the Cadence terminal: *No tech lib map file 'assura_tech.lib' or 'pvtech.lib' found. *No rule sets can be created because there are no defined Assura technologies
Hi. I am simulating a cmos ring oscillator at the schematic level. I want to simulate it with some "interconnect parasitic capacitance" at the output of each inverter. What do you think can be an approximate value of this capacitance that I need to put at the output of each inverter so that when I do the layout, there is not very much (...)
I have two 3-phase inverters. One is from Semikron (with IGBTs, rated 600V, denoted as Semikron-inverter in this post). Another one is a home-made prototype. The schematic of the home-made prototype inverter is shown in Figure 1, while its physical layout is shown in Figure 2. The specifications of the power switches (...)
I am doing a project on standard cell. Gate is Nand3x4 . The problem is that i need to accommodate layout within PR boundary which 5.44x2.88 (fixed) . I tried layout after splitting (folding )Nmos and Pmos gate , but splitting increases my area & it crosses PR boundary. How can i reduce my number of transistor. What are different layout (...)
what i can do i need their layout?
After LVS process , i am getting few errors. DRC was without any error. After running LVS , got 6 errors ... layout is of inverter with A as inputs ,Y as output , alongwith Vdd n gnd. 1) Missing ports 2) property errors. In Missing ports , i m getting error in every port i.e. in A,Y,Vdd,gnd. how to rectify this? i added name in (...)
Hi, I am designing a SAR ADC. I designed a MOM-cap for unit capacitor of DAC by myself which is not provided by foundry. I have created a symbol and layout view of capacitor and in an example schematic connect the cap symbol to an inverter and in layout connect inverter layout to the cap (...)
There are several possible reasons: - wrong circuit connections (you didn't show a schematic) - insufficient dead time of gate signals - unsuitable circuit layout
Dear Friends I wonder if you have good tutorial and examples of how to layout a simple circuit such as an inverter, and post simulate it. I also need to learn how to do the monte carlo analysis. Regards,
Dear Friends I would like to know if any of you has a simple help, tutorial and example of (for example: an inverter) how to layout and post simulate a circuit in Cadence 6.1. I do appreciate it. Regards, Samaneh
Hai, I want to make the layout of a delay element. So first i made the layout of an inverter. And i used the symbol in the schematic of delay element and from that i generated the layout. Next i want to do some optimization using hierarchy. For example i wanted to make the nwell common for all pmos transistors and use (...)
Hi! I am trying to develop a power inverter. But first , I need to optimize the layout in terms of resistance, inductance and current crowding. I am working with Q3D (though I am not sure if this the right tool). I will be using SiC JFET dies for the switches. In the material selection guide, SiC does not exist. But for the values of conductivity
-- Posted this in the job section, nobody seems to be replying -- Hi All, Could anybody tell me what kind of questions are generally asked from Digital CMOS layout during a job interview ? I have an upcoming interview coming up for design engineer and there is a dedicated session on layout. Any help is highly appreciated. TIA
Hi All, I am using this book: Basic CMOS Cell Design by Etienne Sicard. I'm trying to simulate everything for better understanding. At page 96, Section 4.3 there is an introduction to the "inverter layout". My question is about this: p-channel MOS switches half the current of the n-channel MOS. I understand the reason: let's sa
Hi all, 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 Connections. Could any (...)
Hi All, 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. -- warm regards, krrao.
hey u all my seniors, in my country there is lot of problem of load shedding even 14 hrs a day no electricity....... so i wana make my own UPS rectifire+inverter plz give me complete layout of pcb also circuit diagram complete details of components and their specification i hope u Einstein pple will help me..... if u can mail me
hey u all my seniors, in my country there is lot of problem of load shedding even 14 hrs a day no electricity....... so i wana make my own UPS rectifire+inverter plz give me complete layout of pcb also circuit diagram complete details of components and their specification i hope u Einstein pple will help me..... if u can mail me
Hi gurus, I am trying to do a simple inverter layout, when i run DRC i am bugged by this DRC error of Info: hot nwell. vdd! is labelled on to the M1, so thats not the mistake i have done ! I dont have any clue absolutely how to solve, Any help is highly appreciated. Regards, santini
Hi all, I tried Abstract generator to generate abstract for layout. The try was on a simple inverter having A as input Y as output and GND/VDD as input/output pins (schematic view). In layout view of this inverter these I/O are labels on Metal 1. In the Virtuoso layout Editing window I select (...)
Can any body help me on L-Edit to draw layout from *.tpr file . I draw the schematic of circuit (inverter) by S-Edit , export the TPR file to use in L-Edit . I follow the procedure according to L-Edit manual ,but there is a prolbem in core, node ,.. (I use the Tanner version 13)
Hi everyone! So here is the problem, i found alot of tutorials for previous versions of IC, but cant find any for IC6.1. I am makinig an CMOS inverter, everything goes well until i reach state where in previous versions it was deign generated from source (in Virtuoso XL layout editor: Design>Generate from source), but in IC6.1 i cant seem to fin
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.
Hi, I wanted the details of the Transformer and the PCB layout in PDF format of Oh no! Not Another CFL inverter. The article is found at: I have also attached some more details regarding the Transformer number of windings. But, there is no mention of the Gauge (Thic
Hey guys, I am new to layout and I'm using the mentor tools to make te layout of an inverter. I am not using any models for the transistors so Ill be drawing them from scratch. Does anyone have a basic tutorial that can help me with that??? Thanks alot