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Hello,
I want to migrate from Altium designer to cadence orcad and allegro.
I have basic problem now. first problem is that I don't have library now but I have some projects that many parts that I need was used in it. In altium we had an option for extracting symbols from current schematic, does...
Hi, thank you.
as you see in attached picture controller output impedance is 34ohm but line impedance is 50 ohm and termination impedance is 30ohm. could you please tell me how they choose these values?
Hello,
I want to design FPGA board with 64 bit DDR3 interface (4 DDR3). I choose FLY-BY topology. I read many documents about DDR3. but I am confused because I didn't know how I can set the value of external resistor termination of address command and control. I saw many different value in many...
could you give me a shematic diagram of what you said? as you said user should manually select 2 wire or 4 wire communication? or not without any changes like above image it can work with 2 wire and 4 wire.
any help would be greatly appreciated.
Hi,
I am really confused I saw some equipment that work with 2 wire and 4 wire RS485. they used same wire so they used one IC for converting. as you see in the picture
but as I understood from MAX3490 just can support four wire. how I can used it or some IC like this in both condition 2 wire...
really thanks as I saw in application note and datasheet of non isolate part like ADM3490 analog devices, it doesn't use any ground connection even for it's evaluation boards. but I got that in some cases some manufactures used ground. so with your answered I understand using ground improved...
Hi as I know RS485 full duplex, doesn't need ground but in some sites I saw that someone used "RS422" with 4 connection and some of them 5 connection(4data + ground).
which one is true?
all the best
Siyavash
Hi FvM Thank you,
I changed solder Mask opening with changing VIA solder mask Expansion to specify expansion value = -30 as you see in picture '0' .
I think with this work some problem solved but manufacturer sent me again these two questions:
1:there are still some vias whose soldermask...
Hi,
I set 8 layer PCB to manufacturer but he sent me question file and said:
question: the soldermask opening of many vias are same size with holes and they are located in BGA areas,pls confirm
Recommendation /suggestion :
delete their soldermask opening
What I did:
Vias under BGA parts has...
it is violates grounding of the place where the patient is lying down. but I can change board design, I want to design new PCB. so if you have any idea for changing schematic and PCB.
Really thanks andre_teprom .
- - - Updated - - -
Hi is it possible explain more about C. I can't change...
Hi,
I separate grounds with ferrite bead I test my circuit again. My ECG Cable is 1 meter three wire 0.5 meter of shielded other 0.5 meter of cable separate each lead and this parts of cable aren't shielded. So when I found just when noise source like body is near to this part output goes to be...
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