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13 Threads found on edaboard.com: Pad Selection
... how to simulate the IO output impedance? I want to use a IO with output impedance of ~50 ohm to match the PCB impedance. I did the simulation like this : 1.for a 8mA IO pad, I set input signal to 1.2V, and connect the output to a 'idc' source with dc current 8mA, ac magnitude 1A 2. do ac simulation, and plot the o
Have you connected the EP (exposed pad) under the body to GND and some sort of heatsink? It could be that the regulator is reverting to a protection mode when loaded. Are the capacitors in use low ESR types? How do you know the inductor should be less for 5V than for 3.3V? Any application references for the component selection formulas in use?
The most ancient speed controls used an L-pad. Simple, fairly low loss, and hard to find anymore. Inductive loads can be controlled by triac / SCR dimmer styles but there is more voltage applied at the current-zero-crossing which the design has to accommodate (lamp dimmers have it easy). This is really just component selection (but you need to h
Hi, Can anyone help me how to select the Via hole size.right now we are using 40mil pad with 23mil drill. in IPC2221A it was mentioned to take 0.3mm drill hole to vias for reducing the inductance at highfrequencies.If any one explain me what are the things that will effect by changing the via size and its hole. -- Rama
hi on the PCB, u can select any pad or track what ever u want and then right click and use "find similar objects". the other way is to set the rules or you can use the pcb filters. hope this helps. Regards
I have been using OrCAD 16.0 for a while now and have gotten used to it. Recently, I installed OrCAD 16.2 to my machine. And as soon as I opened the pad Designer to make a new padstack, I noticed little differences between the two versions. The selection for Type (Through, Blind/Buried, Single) and Internal Layers (Fixed, Optional) that are (...)
Eg. * Determine the location of large block * Macro placement, such as RAM, HardIP, analog block ... * Determine the location of IO pad * Power topology selection
how many sso(4mA driving) pads can 1 P/G support how many sso(8mA driving) pads can 1 P/G support how many sso(12mA driving) pads can 1 P/G support process: .13 generic TSMC process
DTMF = Dual Tone Multiple Frequencies. It uses selected audio frequencies for row and column of a number pad of an analog telephony system. The selection basis is such that none of the frequency is a harmonic or a multiple of one another. Therefore there is no aliasing. When a number is pressed, two frequencies (one from the row and the othe
Which wire load models should be selected and how do I use the pad information for my synthesis. How do I tell the tool to select the best model it seems fit? The wireload selection depends on the size of the design... for eg in tsmc 13u lib tsmc_wl10 is used for design of approx 10kgates tsmc_wl50 is used for des
Hi, say i have a design that i am migrating to smaller feature technology. Can anyone tell me wht are the key points that i should note while i select equivalent IO pads in this smaller technology. cheers, Gold_kiss
Anyone can give some documents about I/O pad selection? thanks!!!!!!
Anybody knows how to choose current of output for I/O pad of ASIC, I have a design of ASIC, the vendor say their I/O pad have 1, 6, 8, 12, 24 mA, but I do not know how to choose it for my ASIC, choose smaller, I am afraid it can not have enough drive capability, choose larger, I am afraid it will cause ground bounce or make noise, crosstalk et


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