Posts by Olin Lathrop
We don't just give direct answers to homework (or homework-like) questions here, but can help you work thru the problem on your own. You might consider trying to synthesize a subtractor from scrat...
I was hiking around the Berkshires in western Massachusetts yesterday, and came across this metal panel where some power lines were crossing a ridge: The panel is a few meters wide, and appe...
This is a good question. I wasn't originally envisioning introductions to known concepts, but that might work if well written. If so, the Paper should at least be clearly labeled as such. We don...
Sorry I didn't notice this earlier. We definitely don't just want to import questions and answers directly from SE. This has been discussed several times on various Codidact sites. Some of the f...
While input offset voltage is technically noise in the sense that it is something unwanted added to the signal, it is not included in opamp noise specs as far as I have seen. Think of the "noise" ...
Antennas are not lumped-parameter systems. They may be open circuits or shorts at DC, but this changes as the frequency goes up. They aren't just a bunch of wires anymore at the intended operatin...
Take a look at the circuit and try to see what function it will perform on the input signals to yield the output signal. For simplicity, let's consider the diode ideal, R1 and R2 the same, and R3 ...
I just happened to re-read this question, and I now think I see better what Microchip was trying to say here: On closer examination, I think this is actually correct but badly worded. I believe...
To be clear and protect against possible future edits, here is the circuit being discussed: As you say, this is a differential to single ended converter. In this case, the MOSFETs have likely b...
You need to be more careful. First, you should have been able to see for yourself that the first equation isn't written right. I'll assume the whole "-0.5t" is the exponent of e. You were too sl...
That looks like the internal compenstation capacitor. It creates a single dominant pole over most of the opamp's intended operating range. Opamps with dominant pole compensation can be characteri...
To summarize the problem, you have 12 V battery packs that you don't want to change due to certifications, but you need to power a 48 V 4 A load. The battery system also needs to be compatible wit...
Your question is quite long, so it's not clear what exactly you are asking. It seems the main point is what Microchip means by Note 5 on page 7 of the datasheet: You are right, that makes no se...
First, let's draw the schematic properly so that it's not so annoying to look at: Yes, it's a differential amplifier. Q1 sinks current as a function of VIN+. Q3 and Q4 are a current mirror tha...
I get a phase shift of 90 degrees between voltage of the capacitor and current through the capacitor which doesn't make sense it should be 45 degrees You don't need a whole circuit to see that the...
Since this is homework, I'm not just going to give you the answer. When all else fails, go back to first principles. That's what handy shortcuts, like using impedance, were derived from. In this...
say that materials should be small and focused There are many many theories of how to best present information. Any one or two particular opinions aren't really relevant, especially since there i...
At first glance, R22, C22, and C23 look like a compensation network around the TL431. However, this doesn't make much sense because the TL431 is being run open loop. Rfbt and Rfbb divide down the...
Your basic idea is fine, but your implementation is not. C1 makes the whole thing not work, as it will block DC. C2 puts a burden on the switch. D1 would preferably be Schottky. I'll write a mo...
It sounds like you are doing the measurements right. However, I expect the problem is in the space around the antenna. At 434 MHz, the wavelength is 690 mm or 27 inches. Everything out to about ...
There is no "standard" 12 V DC jack. Asking end users to buy a separate power supply is asking for trouble. Don't expect users to know about center-positive versus center-negative, and inner and ...
Lower ESR can sometimes be a reason, as you say. However, most of the time the advantage is a wider frequency range over which the combined capacitor has low impedance or low dissipation. The fre...
I am not familiar with that chip, and only took a very quick look at the datasheet. Here is the block diagram of the part from the top of the first page: A few things pop out from this: This c...
What is seems you really want to know is how to size a power supply filter capacitor, not what the input capacitance of something is. The objective is to keep the ripple voltage below some value. ...
PCB antennas are not designed by electrical engineers, but guys with pointy hats and wands They use trial and error after starting with the result of some mystic ritual including lots of mumbling ...
