User talk:Rogerbrent

request to modify NMOS cascode amplifier figure

Hi, Rogerbrent.

I'm not an expert, but it appears that Figure 1 in Cascode (File:NMOS-cascode.png) is a mix of small signal and large signal models -- specifically, the gate to the upper FET is actually biased, and is not tied to ground; FYI, if the model were small signal consistent, the power supply would be ground as well.

For new users, who are going to the Wiki to find out about Cascode arrangements, they expect to see the actual circuit, not a mixed circuit for analysis -- having that upper FET gate grounded is confusing.

Are you OK with changing (or allowing others to change) the figure to show a bias voltage on the upper FET?

WhackTheWiki (talk) 12:13, 12 April 2011 (UTC)

Figure 1 in the Miller Effect

I see you created the image for the miller effect derivation, if you look at the original source however, the Av is actually stated as -Av . This is very important in the derivation, I was wondering if it were possible for you to change it, thanks.

Hi. When the article was first written, there wasn't a negative sign attached to $A_{V}$. This seems to be consistent with Miller's original definition of the gain of a tube in his paper (the first page of the document you link to is a paraphrased summary). Personally I preferred the previous terminology, but you are right that the article has become inconsistent. We should discuss this further on the Miller effect talk page. -Roger (talk) 19:45, 23 May 2011 (UTC)

Deletion from commons

Hi Roger, the Miller effect article was off my watchlist for some time so I missed this question from you. Sorry for the late reply. The deletion is a bit inexplicable in this case, but often the problem is a botched move from Wikipedia to Commons. The trouble here is that if Commons has a problem with an image for whatever reason, they might inform the person who uploaded it locally on Commons but they never bother to inform the original creator on Wikipedia so you can entirely miss it had a problem, you will entirely miss it being deleted, and, since a bot comes round afterwards and removes the redlink in the article where the image used to be, you might entirely miss that the article ever had an image in the first place.

On images I upload to Wikipedia I always add {{keeplocal}} which should stop admins deleting the Wikipedia local copy if the image gets moved to Commons. It then does not matter what Commons do with their copy of the file, the Wikipedia article will always show the Wikipedia local copy. Occassionally I need to remind admins to look for the KeepLocal template before deleting but generally this works well.

Your alternative is to keep an account on Commons and make sure all your images are on your watchlist there so you get warned if there is an issue. This is a bit messy however - you need to watchlist the originals on Wikipedia as well so you can see when they get moved to Commons. You then need to go over to Commons and manually put them on your watchlist there as this does not happen automatically. If you are going to maintain a Commons account and watchlist, for new images you create it would be simpler to upload them to Commons directly rather than Wikipedia, but personally, I would rather keep everything on Wikipedia where it is easier monitor. SpinningSpark 09:35, 22 May 2011 (UTC)

Thanks for the explanation Spark! I'll keep that in mind next time I upload an image. -Roger (talk) 19:48, 23 May 2011 (UTC)

GA of voltage doubler

Hi Roger, would you mind taking a look at Talk:Voltage doubler/GA1. The reviewer has an issue with the article scope and I would be grateful if you could weigh in with an expert opinion. Thanks, SpinningSpark 09:51, 1 July 2011 (UTC)

Voltage doubler

You have been referred to at Wikipedia:Good article reassessment/Voltage doubler/1 SpinningSpark 19:08, 3 July 2011 (UTC)

Examples of convolution

I saw the wiki page, but I couldn't find any examples using actual numbers evaluating the formula. Could you give some examples of convolution, please? Mathijs Krijzer (talk) 22:09, 9 March 2013 (UTC)

Definition

The convolution of f and g is written f∗g, using an asterisk or star. It is defined as the integral of the product of the two functions after one is reversed and shifted. As such, it is a particular kind of integral transform:

$(f*g)(t)\ \ \,$	${\stackrel {\mathrm {def} }{=}}\ \int _{-\infty }^{\infty }f(\tau )\,g(t-\tau )\,d\tau$
	$=\int _{-\infty }^{\infty }f(t-\tau )\,g(\tau )\,d\tau .$       (commutativity)

Domain of definition

The convolution of two complex-valued functions on R^d

$(f*g)(x)=\int _{\mathbf {R} ^{d}}f(y)g(x-y)\,dy$

is well-defined only if f and g decay sufficiently rapidly at infinity in order for the integral to exist. Conditions for the existence of the convolution may be tricky, since a blow-up in g at infinity can be easily offset by sufficiently rapid decay in f. The question of existence thus may involve different conditions on f and g.

Circular discrete convolution

When a function g_N is periodic, with period N, then for functions, f, such that f∗g_N exists, the convolution is also periodic and identical to:

$(f*g_{N})[n]\equiv \sum _{m=0}^{N-1}\left(\sum _{k=-\infty }^{\infty }{f}[m+kN]\right)g_{N}[n-m].\,$

Circular convolution

Main article: Circular convolution

When a function g_T is periodic, with period T, then for functions, f, such that f∗g_T exists, the convolution is also periodic and identical to:

$(f*g_{T})(t)\equiv \int _{t_{0}}^{t_{0}+T}\left[\sum _{k=-\infty }^{\infty }f(\tau +kT)\right]g_{T}(t-\tau )\,d\tau ,$

where t_o is an arbitrary choice. The summation is called a periodic summation of the function f.

Discrete convolution

For complex-valued functions f, g defined on the set Z of integers, the discrete convolution of f and g is given by:

$(f*g)[n]\ {\stackrel {\mathrm {def} }{=}}\ \sum _{m=-\infty }^{\infty }f[m]\,g[n-m]$

$=\sum _{m=-\infty }^{\infty }f[n-m]\,g[m].$       (commutativity)

When multiplying two polynomials, the coefficients of the product are given by the convolution of the original coefficient sequences, extended with zeros where necessary to avoid undefined terms; this is known as the Cauchy product of the coefficients of the two polynomials.

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Warning box question

Roger, I am new to Wikipedia editing as of about a month. I have done quite a bit of work on Radio transmitter design and notice you have worked on it in the past. My question is what is the procedure for getting rid of the "multiple issues" box at the top of the article? I think I have addressed some of those issues and will try to address more if needed. Is there some automatic process for assessing the continued need for the warning box? Are editors free to delete it if they think the issue is resolved? Thanks for any help. JNRSTANLEY (talk) 14:19, 11 June 2013 (UTC)

Hey, You can remove it if you think you've addressed the issues mentioned. Nice work BTW, though I still feel like the article isn't quite there yet. -Roger (talk)

Thanks for the encouragement and also the info on how the warning boxes work. I will do a bit more. So far no blow-back on any of my edits, so I am gradually becoming more "bold". JNRSTANLEY (talk) 13:03, 12 June 2013 (UTC)

Good luck! I'll try to get more involved in the article again and see if I can help get it in a better state. -Roger (talk)

Asymptotic gain model

Hi,

I see on the wiki page that you reference Rosenstark's 1972 paper and you also reference Middlebrook's 1964 paper. I have tried to locate Middlebrook's paper to see if he has this asymptotic gain model but I cannot locate it. Do you have a copy available that I could see. Johnseecg (talk) 20:46, 16 October 2013 (UTC)

Hey. Sorry, I don't think I have a copy of that paper (and I'm not sure if I added that particular reference). Rosenstark's 1986 book does cover it though, so I can only attest to that reference. He might have coined the term actually. Middlebrook's extra element theorem generalizes it, but I believe his first paper on the subject was in 1989. -Roger (talk) 20:59, 16 October 2013 (UTC)

I was able to locate that paper and Middlebrook does have the asymptotic gain model in it so I believe that the 1964 paper is the first publication of that model. It is a tough reference to find though. I expect that Rosenstark developed it independently in 1972. Johnseecg (talk) 09:44, 17 October 2013 (UTC)

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