Recent content by nitin.jain

I could help you, but you have to elaborate upon what exactly do you seek. Words like 'case study' sound as if this project had some MBAs involved in it :-p. Well, maybe you can try giving an analogy from some different (technical) field? As for 'analysis', what do you want to analyze (or...

Thanks for your reply! I've actually just discovered the wonderful and mysterious world of Step Recovery Diodes too! :biggrin: And I believe you allude to the HP appnote http://www.hp.woodshot.com/hprfhelp/5_downld/lit/diodelit/an918.pdf" , is that right? It does seem nicely descriptive...

Hi all, I wish to build a triggerable circuit that gives out a single-cycle, such as the one given in the pic attached (the middle one, with magenta and blue colours). While square/trapeziod/ramp cycles are good, even an exponential fall in the beginning and rise in the end would be fine (the...

Is that not the very reason they (for example, the Wigner function) are 'quasi-probability' distributions? As in, the value of W(Xa,Pa), with (Xa,Pa) being some point in the phase space may or may not make sense... however, any physical region that Nature (in other words, HUP) allows you to...

Thanks Mike, the photodiode I'm using is a custom-made product, so I have capacitance values at only 4 discrete voltages, I hope that shall do? Here they are: 0 V - 10.5 pF (at 100 kHz) 5 V - 5 pF 10 V - 2.5 pF 20 V - 2.2 pF I am using a reverse bias of ~15 V, as such.

Yes, sorry I forgot to mention that I was using a 50 ohm connection between the BNC and the output of the high pass filter stage (after the opamp) as well. I've updated this in the schematic now. I have been using the ferrite beads and the bypass capacitors too, though the values were chosen...

Hi Mike, you were too fast! :) The board is double-sided, I've explained a few things in my latest post. I've also attached a pic of how the backlayer looks like. On the front side, and between the signal or supply traces, I intentionally left copper (with sufficient clearance) to form...

I have GND planes on both the front & backside of the PCB. On the backside, the GND plane covers around 80% of the board and is continuous too. It's removed out near the opamps (their feedback paths, to be precise) and the resistor bridge between them. I've interconnected the various small and...

I can't remove the earlier schematic for some reason. Putting in the new one!

Hi everyone, Thanks very much for your prompt replies. Firstly, some apologies for a few missing details as well as small mistakes in the schematic I sent you, I've updated that now and have also added a pic of the front side of the actual circuit (on PCB), showing various portions that have...

Hi! I guess this thread (could) bear similarities to the discussion in the "Low noise low pass" https://www.physicsforums.com/showthread.php?t=332819" thread, but I didn't want to hijack that :) so beginning a fresh one. I find that the electronic noise gets aggravated, when I connect the...

Hi, Sorry for this late response, I was heavily occupied in other tasks. I'll return to working on the circuit today, and will try the above suggestion. Thanks again, Nitin

Yes. It's something that has left me very puzzled as well. Getting that huge noise even without any optical fields impinging on the diodes, except for the stray light of the room doesn't make sense. The spectral responsivity of the diodes is around 0.58 A/W at the desired wavelength of 790 nm...

Thanks Bob. And apologies for not giving the resistance values earlier. Anyhow, as of now, I think focusing on getting a good overall frequency response is a better idea, compared to doing just a DC balancing, as I've explained in the last paragraph of my previous post. So I'll probably be...

Hi, I guess I was a bit abrupt in the last post... forget the "the light field of a quantum state" statement... I've attached a pic now that shows optical homodyne detection (50:50 BS stands for a symmetric beam splitter, it reflects and transmits equal proportions of input light, i.e.)...