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31 Threads found on Layout And Wide
I am a Electrical engineer and have over 3 and half years of experience of professional PCB Designing.I gained wide exposure on all aspects of PCB layout expertise is on Altium Designer, Eagle,PADS,P-CAD and Allegro. I worked with many local and international clients and (...)
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
Whenever I open an existing Allegro layout or create a new one, when I attempt to create artwork (274-X Gerbers), I get a listing of the layers, but NO check boxes from which to select what layers I want to export the gerbers. See attached picture. Could it be a graphic card issue as I noticed the aspect ratio is a bit wide and I do not (...)
Hi all, In the post layout extraction ( pex extraction ), if there's any problem occurs in pex means, we need to vary ( increase or decrease the resistance & capacitance ) in some signal lines.. I think we can reduce the resistance by using an higher metal instead of using metal 1 or 2.. Likewise, I need to know that " How to increa
Of course this is ok. For the layout you have to consider the parasitics, and probably you'll have to change its value.
Hi, first: don´t be afraid of the switcihng technique. It works well. Most important is the layout design. short and wide traces, good power plane, multiple vias to gnd, use ceramic capacitors and good quality inductors. there are ready to use step down switching modules as pin compatible replacement for 78xx. If you (...)
I don' understand the layout. Gnd isn't even connected between power input and outputs. In any case there will be huge ground voltage drops spreading over to the controller side. With small changes, e.g. rotating the relays by 180 degrees, the current pathes can be considerably improved. You need extra wide traces for 9 (...)
Hello, First, your problem has nothing to do with common centroid. LVS cannot understand if you used such a technique. 1)Using multiplier must give you multiple objects. I have not encountered this before. Generally I use a mix of multiplicity and fingers. 2) You haven't connected the bulk of the transistors. You must add a contacts for the
Post layout analysis just takes care of and incorporates the extracted parasitics. If you are interested in matching accuracy, you should run Monte Carlo simulations, if your fab/foundry provides the parameters for local, distance, wafer wide & wafer lot mismatch, as well as for process mismatch, s. e.g.
All this software is somehow useful for planar filter design, if you know the filter design methodology. HFSS, Sonnet and CST can do EM simulation to analyze the layout when it is ready. ADS and AWR can do both: fast circuit model simulation to develop the initial layout, and also EM simulation to analyze (...)
Your 20dB insertion loss at peak is far too high. Something is wrong with your interdigital filter, probably too wide spacing between the coupled lines. These oscillators in particular were built hundreds of times, mostly worked from the first try. The author optimized the circuit and the layout for the specified transistor, so if you (...)
I'm currently working on my senior project for my EE degree and I am designing a PCB that requires a bipolar power supply. Currently my PCB design (version 1, with a single ended power supply) has 4 layers, the middle being power and ground. The power planes are split into analog and digital planes as well, as noise is of concern. I'm (...)
how to design high speed opamp which can deliver 100mA of output current? Do we need very wide mosfet at the last stage ? e.g. when the W/L=1, the bias current is 1uA. then when 100mA then W/L=100000? how to layout??!! and the large mosfet will cause low speed. how to high speed? thank you a lot!!!
Can anybody help me for pierce oscillator layout. used as macro. Actually i have done modifications in Pierce oscillator layout. actually frequency is 20MHz. used wide metal routing for xtalin and xtalout nets, which are going to core pins, and done the sheilding for those nets. subcircuits are (...)
I have a wide devices of W/L 120u/0.6u. I am planning to do multifinger device simply because of the area issue in layout. What is the limitation in # of fingers ? The PDKs which I know, don't put a limit on the # of fingers. More often the W/finger is limited, e.g to max. 10 or 20?m. What is the exact u
Hi, The main important point you must consider in the BandGab layout is the parasitic resistance, rather than parasitic capacitance. So you have to Route using mult-Stack-wide-metals between the BJT, Current mirrors, and Resistor Network
Isn't easy to summarize the line guide for RF layout. - symmetry - minimize capacitance parassitcs in critical net - take in account the coupling due to high frequency - isolate and protect sensitive/aggressive blocks - good contact of substrate Anyway a good reference is "The art of analog layout" by Alan Hasting. Bye
I designed a meander antenna in ADS layout and wish to improve the S11 by matching the input impedance at the port (50 ohm) thats Single mode transmission line excited. Any suggestions?
friends, my Rdson of the main switch and synchronous switch is about 100mohms(0.35um technology). they are also very wide. my question now is, how do we layout the switch so that even after extraction, the ON resistances does not increase too much. could any of you give me an actual snapshot of the switch (...)
Hi AdvaRes - I guess the process is indicating that if you are using a wide metal then some process need a multiple rows of vias i.e 10X10 VIA's or maybe that you need a large size of vias but normally large sized VIAs are used in bondpads or IOPADS. I would suggest that if you used wide metal make a multiple rows and columns of vias, (...)
Hi .... I was just wondering what all precautions we have to take while routing very low voltage signal traces (sub-micro volts and fA?s) .Also what are constraints regarding layout, power lines and decoupling supporting that. Thank you so much in advaNCe!!
1)the tuning range is limited , coz it depends on the mechanical tuning 2) there are 2 usually used , topologies , serie feedback , and parallel , the parallel used alot in the SAT receivers 3) i don't know , how much it will deviate but it will depend on ur layout , and the prasitics 4) if u want wide (...)
You are describing a layout trick for large (wide) transistors. It is much easier to explain if you can see the picture. Essentially, for very large W the poly gate becomes fairly long and thus has a fair bit of resistance associated with since it poly is fairly high in ohms/sqare compared to metal. You split up the large transistor into (...)
pls see the book cmos circuit design, layout, and simulation by r. jacob baker p654 if u get soft copy pass it to me pls regds
During ESD testing 4KV HBM the current pulse can reach up to 2 - 2.5A within 100-150nsec. So for I/O it is better to layout power lines as wide as possible.
This is my headphone amp built. A very good sound, extended bass and wide soundstage. If anyone wants to try it, mail me for pcb layout.
Hello All, After I used many years Calibre and from time to time Dracula for layout parasitic extractions, now I have to do this with Assura. I find few things that put me in a difficult position, and make to untrust Assura results. (Like a conffirmation that Assura don't work properly) Description case 1: I have two (...)
I have designed a LNA for wide-band application. After finishing layout and postsimulation, i found mismatching of input and output make the noise figure deterioation. But ,presimulation shows matching is good. Is the result believable? How to improve it?
Hi all, I use layout Plus 10.3.0. in some cases we need to have a track that has a wide width (e.g. 60 mils for VCC or GND). but we may have components that have low pad spacing such as SMD ICs. if we want to route these tracks to these components, we may route the track with wide width (60 mils) to a point near the component pin (...)
the RF layout topic , it is hard to find in a book or article it depends in many things even the foundaries when providing u with models , it is valid for a shape of layout and it depends very much on the width and length so the transistors u donot have a real wide variaty of (...)
hi after matching the two port atf36077 with s11=-9db,s22=-9 db at (8-12 ghz),without using the discontinuity,if i use the discon.the resuls change alot,if i neglect it,is it affect the layout and the s parameter results,also if i put lamda/4 for the gate and the drain ,it also affect the result.what i do pls help me if i want (...)