Anurag is - as usual - doing the job the corp. refuses to do (from what I've seen). Good work.

@BhargavaAnurag

3 жыл бұрын

Glad you liked it...

Another very informative and useful video.

@BhargavaAnurag

3 жыл бұрын

Glad it was helpful!

Can I assume the final cutout depth equals the same depth that would be required if the transmission line itself were the same width as the 1mm pad? In other words if you just calculate the standard 50 ohm microstrip impedance at a width of 1mm you just calculate the separation between the plane and trace? I've always assumed this to be true with a slight variation with the edge fields. Also, why do you cut out the reference plane under the trace prior to it hitting the pad? Don't you create a high impedance mismatch there? Don't you want to shape the cutout such that the trace has a solid ground plane up to the pad? Or does this have a large affect on the impedance? I've never had software to model this. It seems like there may be better geometries. One other thing you don't mention is grounding vias to stitch the layer 2 reference to layer 3-5 layers so the return current has a path. Does this software automatically take this into account?

@BhargavaAnurag

2 жыл бұрын

Hi Andrew, Too many questions here....😊 What I showed is a concept and once you have tool like ADS, you can be artistic and come up with a geometry that works for your specific case so there is no right or wrong method that works for all use cases. All ground layers are connected by VIAs which are defined in the stack up definition as well as drawn in the layout, tool doesn't do these automatically and user needs to define them the way they want to use them. I probably should have made it clear during the video and not assume everyone would already know this...😒 Thanks for the feedback, will be more careful in the future videos to not to leave it to anyone's imagination...👍

As always, very informative and well thought out video. Are you planning on doing a video about oscillators (e.g. negative resistance or feedback oscillators)?

@BhargavaAnurag

3 жыл бұрын

Hi Andre, I hope to do something on Oscillators but not in near term.

@killerelf23

3 жыл бұрын

@@BhargavaAnurag Just seconding the interest in oscillators and looking forward to whenever you get to them. Thank you so much for these videos - they have been great!

I thought discontinuities in the reference ground layer are strongy advised against in many RF application notes. The reason being that the return path still travels on m2 layer but makes a loop around the slot that is created creating an inductive loop or worse the slot can become a radiating antenna. I didn't understand why the path now travels on m3 layer?

@BhargavaAnurag

2 жыл бұрын

It is correct that slots in ground is not advisable in RF board designs but at times you have to do it to avoid the mismatches. All ground layers are shorted by VIA for maintaining the return path transition.

Thank you so much for sharing your knowledge as always! I have a question though. Why do you input 0.001 Ohm but not 0 Ohm? Why is it not a best practice?

@BhargavaAnurag

Жыл бұрын

Simply because 0 Ohm only exists in theory books and not found in any practical RF applications...😊 Don't sweat too much on this and focus on the objective....👍