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About designing the boards which carry the components of an electronic circuit. For questions about getting them built instead use PCB-fabrication. If your question is specific to a certain CAD tool, say which tool and version you are using.

2
votes
2answers
What are the recommended placement and routing techniques for the following RC low pass filter circuit: I made an initial placement and routing that's shown below: Actually it's randomly placed …
asked Jul 16 '12 by Abdella
16
votes
2answers
I want to supply a DSP with 1.2V. This DSP needs 2.6 Amps of current at full load. The minimum supply based on the electrical specs of this DSP is 1.16V, which means that the maximum voltage drop caus …
asked Jan 22 '12 by Abdella
2
votes
1answer
I am searching for a power module that takes +15V and converts it to -15V but one important spec is the "Output Voltage Ripple" rating. I found this module from TI: PTN78000A I found that its output …
asked Oct 31 '12 by Abdella
5
votes
2answers
I'm designing a part of a system that will receive 4 analog signals carried on 4 twisted pair cables which are input to an ADC. These signals are low speed (probably in KHz) bipolar ranging from -10V …
asked Jul 27 '12 by Abdella
40
votes
3answers
I used to check complex commercial PCBs specially those of graphics cards to see how professional PCB designers do their layout and learn from their techniques. When I checked the card shown below I …
asked Jul 30 '12 by Abdella
22
votes
3answers
If I use an isolated DC/DC converter, when designing the PCB, should I isolate the ground of the input and the ground of the output as shown below? I've never isolated grounds (except for AGND and …
asked Jul 15 '12 by Abdella
2
votes
4answers
When reading about high speed serial interfaces like RapidIO or RocketIO, I find data rates of 3.125 Gigabits/second and more. My question is: 3.125 Gb/s = ?? GHz What's the relation between Data ra …
asked Feb 18 '12 by Abdella
7
votes
3answers
Just finished a design of a 8-Layer PCB, the highest frequency is 125MHz. I want this design to work right the first time, how should I revise the design and what should I take care of? Something li …
asked Jan 17 '12 by Abdella
2
votes
2answers
The specifications required are as follows: The resistance between ground pins on a connector and the case (chassis) ground should be less than 3 Ohms. The resistance between any other signal on the …
asked Jul 25 '12 by Abdella