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Hello,
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.
Situation:
We are simulating a coplanar waveguide...
Re: S21 in ADS Momentum
thanks for the replies. I did some tests on ADS and i think that S21 gives the voltage ratio when we display the S21 in terms of its magnitude (V0/V1). But if we display the S21 in terms of dB, it's converted into 20*log(V0/V1), so the plot in dB is the same for power or...
Hi
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)...
Hi,
Just a simple question. Is the S21 plot result we get from momentum in dB the voltage ratio or the power ratio? Is there a method to convert one to another in ADS?
Thanks!
Hello,
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.
Thnx!
Re: Stiff PCB material?
thanks for the replies. It's ok if it's not too expensive. It just have to be available commercially. I am however constrained by having to use double sided, single layered PCB since the final design must be lowest cost possible.
i've tried using copper fill in the...
Hi all,
My 1 mm FR4 board warps all over the place when heated. Do u know of a cheap PCB substrate with similar dielectric constant to FR4 but is stiffer?
Thanks
Hi,
Thanks for the replies. I've been away for a while so I could not work on this.
To summarize, these are the things that I should try right?
1. Put 22 uF capacitor after regulator - biff
2. Put the bypass caps closer - biff
3. 10 kOhm resistor to GND on PD - biff
4. Use combination of 1pF...
Hi,
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...
Hi,
Hope someone can help me with the definition of signal-to-noise ratio (SNR).
On the last page of this document:
**broken link removed**
it is said that SNR is the ratio of the peak-to-peak signal and the rms noise
However, wikipedia:
https://en.wikipedia.org/wiki/Signal_to_noise_ratio...
Re: Output impedance
Hi, silly me...i think my simplified circuit is wrong.
The picture below is the actual circuit that I wanted to ask about. In this case is the output impedance 50 Ohm? and why?
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