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Can you suggest a book/reading material that can teach about how to design high speed PCBs for signal transmission? Due to an unfortunate turn of events, I now have to design PCBs with >7GHz bandwidth per line for fiber-optic front-end interface. Hence I think I have to learn about the...
Hi all, i found some discrepancies when simulating a CPW in ADS momentum compared to when co-simulating in ADS the same layout. Wonders if someone can help clarify things. It's a bit involved so I thank you so very much for your patience.
We are simulating a coplanar waveguide...
A question about coplanar waveguides (CPW). A conventional CPW structure is a signal line sandwiched between two ground tracks. Can we get the same characteristic impedance if we sandwich a signal line with the same dimensions between a GND track and a VCC (some DC supply voltage, say +5V)...
Does anyone know what's the typical refractive index of a green solder solder mask material?
Guess that this is not a typical question but we need the value for some optical system design. Cant seem to get the value from web.
At the moment I am trying to design a very low noise power supply for a 7GHz comms circuit. The best power design I got is based on ADP3338 attached below. The circuits require 3.3V and takes in 150 mA current max. The smaller the voltage regulator circuit is, the better.
Have u got a...
Hope someone can help me with the definition of signal-to-noise ratio (SNR).
On the last page of this document:
it is said that SNR is the ratio of the peak-to-peak signal and the rms noise
I came across this voltage source (attached below) but i am unsure what its output impedance is. Is it 50 Ohm and hence must be matched with 50 ohm transmission line and load? How do we proof its output impedance mathematically?
thanks in advance!
I am designing a 10 Gbps laser driver using commercially available ICs. At the moment, I noticed that there is significant noise in the resulting eye diagram. This noise is reduced when I touch the circuit (to be precise, the interface line between the IC and the laser) with my bare hands -...
I saved a portion of my PCB into a region file and would like to paste this into another PCB layout. I need to rotate the region file somehow before pasting it. How can this be done?
If there's another way to cut and paste one layout into another with a rotation feature, please tell me...