Activity for Mu3
| Type | On... | Excerpt | Status | Date |
|---|---|---|---|---|
| Edit | Post #291833 | Initial revision | — | 5 months ago |
| Question | — |
Using only ceramic capacitors on an input of an SMPS - unclear advice from manufacturer I was reading through the datasheet of a boost converter, TPS61023 from TI. In the "Input Capacitor Selection section", they give the following advice: > 8.2.2.5 Input Capacitor Selection > > Multilayer X5R or X7R ceramic capacitors are excellent choices for the input decoupling of the ... (more) |
— | 5 months ago |
| Comment | Post #291109 |
I think you are right and it is meant to be a tripler. The IC itself offers programmable output on the pin and I ran a simulation in which I saw the voltage double at the switching frequency advertised. Probably there is a regulation stage that I didn't take into account. (more) |
— | 8 months ago |
| Edit | Post #291105 | Initial revision | — | 8 months ago |
| Question | — |
Regulated charge pump design I am working with an IC that uses a partially intergrated regulated charge pump. The circuit looks like this: Charge pump circuit It behaves like a voltage doubler. However, when looking at other regulated charge pumps I am coming across much simpler designs such as this on for example: Othe... (more) |
— | 8 months ago |
| Edit | Post #289836 | Initial revision | — | about 1 year ago |
| Question | — |
What are some best practices for library management? Most CAD packages use a "symbol" and "footprint" library approach when it comes to designing schematics and PCBs. Some (like recent versions of Altium) have "component" libraries where symbols and footprints can be assigned to a component which is then stored in a library. Furthermore, a designer ... (more) |
— | about 1 year ago |
| Edit | Post #289570 |
Post edited: |
— | about 1 year ago |
| Edit | Post #289570 | Initial revision | — | about 1 year ago |
| Question | — |
Soft-start circuit behaviour Let's take a soft-start circuit that looks like this: Soft-start circuit schematic To my understanding, the function can be described as follows: - C1 charges to open the gate. Value of C1 will dictate the soft-start delay. - R2 and R1 form a divider that establishes a bias on the gate voltag... (more) |
— | about 1 year ago |
| Edit | Post #287943 |
Post edited: Grammar edits |
— | over 1 year ago |
| Edit | Post #287943 | Initial revision | — | over 1 year ago |
| Question | — |
Using arc trace routing instead of 45 degree trace routing Most modern CAD software for PCB design offers arc trace routing or a form of conversion between 45/90 degree angel trace routing and arc trace routing. Despite this, the overwhelming majority of commercial-grade PCBs seem to still be using 45/90 degree traces. A similar question has been asked be... (more) |
— | over 1 year ago |
| Comment | Post #286841 |
Thanks for the writeup, I will look into assembly code. Are there any books on the topic of programming resource-limited systems that you can suggest? (more) |
— | over 2 years ago |
| Edit | Post #286838 | Initial revision | — | over 2 years ago |
| Question | — |
What are the key programming skills for an embedded systems engineer? I am looking to improve my knowledge of embedded systems programming, specifically regarding microcontrollers and embedded Linux systems. A lot of the information that can be found regarding C/C++ programming, and programming in general, discusses programming for desktop PCs. In my opinion, embedd... (more) |
— | over 2 years ago |
| Edit | Post #286803 | Initial revision | — | over 2 years ago |
| Answer | — |
A: Altium. Reusing schematic symbols for pin-compatible parts. New versions of Altium (22.x) changed their approach to component libraries. You now create components, to which a symbol and several footprints can be tied. This allows you to reuse symbols across your component library (Altium doc). Additionally, you can use generic components in your designs to... (more) |
— | over 2 years ago |
| Edit | Post #286798 | Initial revision | — | over 2 years ago |
| Question | — |
Pick & place file generated by Altium does not match the actual component rotations/positions I am generating files for manufacturing my design in Altium 22 and ordering through Eurocircuits. What I noticed during the ordering process is that the rotation of many components (and sometimes the position) is incorrect. Most often, a component will be rotated by 90 degrees off of what it shoul... (more) |
— | over 2 years ago |
| Edit | Post #285919 |
Post edited: Post title seems to be reversed wrt the context. |
— | almost 3 years ago |
| Suggested Edit | Post #285919 |
Suggested edit: Post title seems to be reversed wrt the context. (more) |
helpful | almost 3 years ago |
| Comment | Post #285907 |
@#53110 "No one could explain reasonably the downvotes I got" - and to be honest, no one has to. (more) |
— | almost 3 years ago |
| Edit | Post #285907 | Initial revision | — | almost 3 years ago |
| Answer | — |
A: Let's make all downvotes public It seems to me like the goal of the proposed change is to fight vandalism. I am pretty certain that no online forum has found a way to stop trolls, simply because trolling is one of the ways people interact with people. I also do not see such a critical need for it. You specifically mention the la... (more) |
— | almost 3 years ago |
| Edit | Post #285782 | Initial revision | — | almost 3 years ago |
| Answer | — |
A: Creating a FAQ: how to read a datasheet I think the Papers section can be suitable. In the category description post it says: > Example of paper topics: [...] A survey of scattered information, with the paper putting it all in one place. A self-answered question would also work well, I think, as such questions are also popular on th... (more) |
— | almost 3 years ago |
| Comment | Post #285648 |
Maybe you can approach the problem from a different angle and look for a tool that can work with different formats. In this case Altium can be useful, as they offer importers for several CAD software packages ([see here](https://www.altium.com/documentation/altium-designer/altium-designer-interfacing... (more) |
— | almost 3 years ago |
| Comment | Post #285349 |
Makes sense. However, what are the downsides of using this method when vias are filled? Then there is no wicking and no tombstoning. (more) |
— | almost 3 years ago |
| Edit | Post #285346 |
Post edited: Added images to illustrate the question. |
— | almost 3 years ago |
| Comment | Post #285346 |
@#8176 the vias are placed on the pads or at the very least intersecting them. I will add the example pictures to the post. (more) |
— | almost 3 years ago |
| Edit | Post #285346 | Initial revision | — | almost 3 years ago |
| Question | — |
Via on pad: acceptable or not? I am designing a PCB with somewhat limited space. To save space, I am placing some vias on component pads. However, I am not sure if this is a good practice in PCB design. As far as I understand, there are certain pros and cons for such designs. Pros - Lower impedance for circuits where this m... (more) |
— | almost 3 years ago |
| Comment | Post #284936 |
@#36396 the core of the question is not about the units. Yes, they are mislabeled in the diagram. However, I am curious about the thought experiment and what the answer will be (in seconds). (more) |
— | almost 3 years ago |
| Edit | Post #284933 |
Post edited: |
— | almost 3 years ago |
| Comment | Post #284936 |
In this case, 1 is 1 meter, the distance between the lamp and the battery. I will edit the question to make this clearer. (more) |
— | almost 3 years ago |
| Edit | Post #284933 | Initial revision | — | almost 3 years ago |
| Question | — |
How long does it take for energy to propagate in a circuit? The premise In a recent video by the pop-sci channel Veritasium, the concept of the flow of electricity and energy transmission in a circuit was discussed. In that video a thought experiment is presented: Thought experiment The video concludes that, after the switch is flipped, the lightbulb... (more) |
— | almost 3 years ago |
| Comment | Post #284253 |
It is unclear what the question is asking. (more) |
— | about 3 years ago |
| Comment | Post #284225 |
I created the post because in my opinion, the downvoting had had no effect. While the initial posts in question were created, they were upvoted, or at least the balance of votes was positive. Looking at the recent questions, they are quite heavily downvoted, yet MissMulan keeps creating them, seeming... (more) |
— | about 3 years ago |
| Edit | Post #284215 |
Post edited: Edited text to remove word repetitions |
— | about 3 years ago |
| Edit | Post #284215 | Initial revision | — | about 3 years ago |
| Question | — |
Quality control of the site Let's take a look at the state of affairs for the past few weeks on this forum. For the past two weeks, some users has been posting a lot of questions, a lot of them self-answered. This is not a problem per se, as sharing knowledge is very important. But let's look at these questions. They are ... (more) |
— | about 3 years ago |
| Edit | Post #283627 |
Post edited: Fixed the values of the poles. |
— | about 3 years ago |
| Comment | Post #283636 |
The TF you calculated is also what I get. I made a typo with the poles in the original post so I will fix that. Also, your simulation makes it very clear. I think that in this paper they made some simplifications based on the suggested values of the components and the fact they are often several orde... (more) |
— | about 3 years ago |
| Edit | Post #283627 | Initial revision | — | about 3 years ago |
| Question | — |
Type II compensation network for a non-ideal transconductance amplifier I am designing a DC/DC converter in the control loop of which a transconductance amplifier (OTA) is used. This part of circuit looks like this: Compensator To determine the needed characteristics, I am using a transfer function provided by the manufacturer (AD). However, today I decided to check ... (more) |
— | about 3 years ago |
| Comment | Post #282745 |
So the DC component will then mostly affect the components in the feedback network? I assume that this noise will be quite small in this case. However, I have found another document from TI where they seen to be including the bias voltage/current in the input-referred noise calculations (see here, Se... (more) |
— | over 3 years ago |
| Edit | Post #282743 | Initial revision | — | over 3 years ago |
| Question | — |
Input offset voltage/bias current noise contribution in operational amplifiers In noise analysis of operational amplifiers, the following is considered: Noise generated by the external components (resistors in feedback network etc.) Noise generated by the operational amplifier itself Manufacturers provide "input-referred" voltage and current noise specifications for ... (more) |
— | over 3 years ago |