Diode Definition and 571 Threads

Hi All Anyone know where I might find the IV curve for a General Electric BD-5 tunnel diode? I have found a few short datasheets for the BD series, but I really need a curve. Does anyone know where to find such a thing? Or should I just get the SourceMeter out and make one myself...

Greetings, I am an electronic engineer doing some research on high power laser diodes. The problem I try to solve needs ~2300W of optical peak power coming from a high power laser diode. The pulses must be with very long (30ms) at very low repetition rates (2Hz). So,the duty cycle is...

folks, when a pn junction diode is formed, electrons in the n type and holes in the p type diffuse. agreed. then how immobile ions are formed at the vicinity of the junction leading to depletion region? how these immobile ions prevent further diffusion? it is being said electrons and holes...

Homework Statement Explain why the BC junction will give a smaller voltage drop, and will thus have a higher voltage measured then a BE Junction. Homework Equations N/A The Attempt at a Solution Okay, hopefully this is the right section to post this in. See, I have read the book...

Homework Statement I'm trying to calculate what voltage change will compensate for a temperature change of 1 degree for a diode. I have set up the circuit, taken down results and plotted the graph (its non-linear). So I re-plotted it using natural logs of I, and got a straight line with a...

Homework Statement Determine reverse sat current of diode. To show and explain approach. Given-IV characteristics of diode and tabulated values for forward bias voltage from 0-0.8v and corresponding current values. Homework Equations At which point do I need to consider to find the...

Hi guys, I'm trying to find a reliable formula for calculating the depletion depth in a PIN diode at a given voltage and knowing the doping of the layers. Does anyone have one? Formulae for the PN diode are common, but don't apply to the PIN directly as far as I can see. I found a formula...

Homework Statement Hi, I need to produce a linearized equation of the following, I = D. V. exp(-V/B) eq(1) I is the current V is the voltage D is a constant B is a constant Data was collected in an experiment designed to investigate the characteristics of a...

Hey all, I have a diode clamper (1 diode) and I had to use a capacitor in lab to smooth out the output (the input was a triangle wave - without the capacitor the output was still a bit triangular at the tips). This is just curiosity - can anyone explain to me how the capacitor managed to smooth...

When a DC coil (relay) is denergized, shouldn't the collapsing field cause a current that would oppose the change in current? Wouldn't that induced current be in the same direction as when the coil was enegized? Not seeing how a freewheeling doide gets forward biased. If I apply Lenz Law...

Greetings: I recently made my first prototype surface mount board. In designing it, all the SMT components were foriegn to me. I'm a ME, not and EE and my projects are fairly straightforward microprocessor based designs. I chose components similar to old standbys I've used with through hole...

http://optics.ph.unimelb.edu.au/atomopt/publications/littrow_rsi_vol72_p4477_2001.pdf The picture of the ECDL I explain can be found from the above web site. The purpose of piezo is to change the cavity length of the diode laser, so that the wavelength can be varied. From the picture...

What would happen if u had a circuit that was earthed at a point and it had an EMF of let's say 9V. If i had 1 resistor and immediately after that i had a resistor and diode in parallel, would any current enter the resistor. My understand is that it wouldn't since once the diode opens up, it...

Homework Statement A Light emitting diode (LED) drives a single mode waveguide that is 10 km long, and has a material dispersion of – 100 ps/km/nm for wavelengths near 800 nm. The LED radiation has a spectral width of 60 nm and is centered at 800 nm. a) If the LED is pulsed on and off in...

When drawing a circuit diagram with a forward bias dioide, is it the "fat" side of the dioide which is on the same side as the "long" side of the battery? Thanks

Hey guys, just thought id clarify what happens when an AC current passes through a diode. Say for instance the wave featured in the link below entered a diode, what would it look like once it leaves the diode? http://www.pcguide.com/ref/power/ext/z_ac.gif

Homework Statement In all physics textbooks, the V-I graph for diode appears like the followings http://211.233.39.205/phpBB2/forum_img/diode/diode-14.gif However, when I conducted the experiment with a 1N4001 diode and 12V-AC, similar graph was found, the the graph seemed to have reflected...

Homework Statement this is a lab task, i have found out the IV characteristic of the diode, now they ask me to suggest a procedure to find the constant A, in the equation I= AT^3 x exp (-E/ kT), T being the temperature, and I = saturation current Homework Equations i know how to...

Homework Statement this is a lab task, i have found out the IV characteristic of the diode, now they ask me to suggest a procedure to find the constant A, in the equation I= AT^3 x exp (-E/ kT), T being the temperature, and I = saturation current Homework Equations i know how to...

I need to understand how diode-resistor gates work. I've read a lot about what's supposed to happen based on inputs, but I need to see some numbers & analysis to understand what's going on. Where do you start in terms of trying to analyze the following AND gate...

when forward bias of led is increased, the intensity of emitted light increases until it reaches a max after which it starts decreasing again...why? also, in which of the two cases is barrier potential greater, led or pn diode?

Say we have a silcon pn junction (diode) - i.e., a block of p-type on left, attached to a block of n-type semiconductor on right: anode ------[ p | n ]------ cathode Because of diffusion we get a barrier potention at the junction, which makes the n-side/cathode 0.7V higher...

Homework Statement "You are required to design a laboratory experiment to investigate how the current in a diode varies with temperature in the range of -20 to +150 Degree's C" Homework Equations N/A The Attempt at a Solution Perhaps using a freezer for the negative temp's and a...

Can someone explain me what a zener diode does? I don't know what the turn on and breakdown voltage mean, and what forward and reverse biased means. And what the difference between a zener and a normal diode is? Thx very much

Can anyone explain me the mechanism of vacuum diode.Specifically how the electronts which are 'boiled' of the cathode behave

http://img151.imageshack.us/img151/1953/51953732lu5.png In this case, is the reverse breakdown voltage at V = 0V since there is negative voltage?

Homework Statement See attachment Homework Equations We are to assume the voltage drop across diodes is .7v (don't use the diode equation!). The Attempt at a Solution I first was assuming that both diodes were "on". Then my work is as follows: V1 is the voltage directly above diode D1 (the...

Over size diode problem There are two sensitive auxiliary relay in one portion of DC control circuit (relay no.1 & no.2) separated by one semiconductor diode. Two relays (R1, R2), their two run up contacts (C1, C2) and that mentioned diode bridge (D) is located in "H" form. When relay no.1...

Homework Statement This problem is to find the I and V by ideal diode model method (assume there is no voltage drop and resistance within the diode) Homework Equations Just simple Ohm's Law equation The Attempt at a Solution First i assume the diode 2 is open, but i don't know...

Homework Statement Find the peak current in the circuit config: V1 = 15v amplitude, 1khz freq. R = 1.5k Vd = 0.7v Draw the transfer characteristic. http://img341.imageshack.us/img341/9761/picture2ge7.jpg Homework Equations The Attempt at a Solution Transfer Characteristic...

Homework Statement Find the parameters of a piecewise linear model of a diode with the following known values: v_d = 0.7V i_D = 1mA n = 2. Make your model fit at 1mA. Homework Equations They are in the image below, written there. The Attempt at a Solution Here's my...

Good morning lovely people ! As I got some really helpful advice here yesterday i though i'd try it again, hopefully you haven't yet had too much from me (-: So my question is concerning the attached PDF file (Last problem #3) i am asked to find the current I_B in 3a) and 3c) but to my...

Hi everyone, I don't have any homework question but I need help on a different thing: I have to write a lab report on "Semiconductor Diode" ... so if you guys know any useful website that can give me some useful and important information (such as appliactions of semiconductor diode...

Homework Statement A scheme of a diode circuit is attached. The voltages at the inputs A and B are 5V. A. What is the output voltage (=voltage at the black node, Z)? B. What values of resistance would you recommend for the resistor R? 2. The attempt at a solution A. The diodes D1 and...

Hi! What would happen if the resistor in the attached diode OR gate removed (connection with the ground would be preserved)?

Hi! There's a schema of a diode AND gate attached. Could anyone of you, please, explain me why the voltage drop across the D1 diode is so big compared to the voltage drop across the D2 diode? Thanks a lot in advance!

Hi! http://www.phys.uAlberta.ca/~gingrich/phys395/notes/node71.html" 's an electrical network for a diode OR gate. It says there that "[t]he 12 V battery does nothing until the power fails; then it takes over without interruption." I just wonder what electrical circuits (closed loops) are...

I have an interesting question about this circuit... if I were to calculate the voltage from point X to ground... essentially all it is, is voltage across the 4 kilo-ohm resistor because if it went the route of the diode, it would lose an additional 2.7 volts.. so its going to take the better...

I have to utilize a Curve Tracing machine on a 5V Zener Diode for a lab. The curve tracer shows voltage vs. current. The lab asks me to examine the curve and determine whether it is a Silicon or Germanium diode, but I'm wondering...what would be different about the graphs of the two types? Wont...

What type of circuit should one set up in order to induce chaotic outputs? My current research is pointing me towards a diode resonator circuit (resistor, inductor, diode in series) any ideas on that model or improvements from other research?

Hello, In lab the reverse leakage current of 4 different diodes was measured. Then ranked from smallest to biggest. Then we are asked to decide which diode would be most suitable for charging up a capacitor and allowing the capacitor to keep its charge for the longest period of time? I...

i am conducting research in chaotic behavior within diodes, can someone please direct me to the derrivation of the ideal diode equation and more importantly for my research, the calculation required for non linear activity in a diode such as that which occurs when the diode is over-reverse...

Hi, everywhere I look for the equation describing the current of a diode, I get I=I0exp(qvb/nkt-1) n=1 for ideal case. for non-ideal diode you got values between 1-2. in order to calculate n you have the equation: n=1+kt/(2*q*phi) (phi=contact barrier height) anyone knows how to...

Here is my question in the formation of Schottky Diode: "Why does conduction band is lower than the original value in the semiconductor side?" And I think it is lower because the postitve charged donor ions provide a attractive force ,which makes the electrons in semiconductor more easy to...

I'm trying to follow an example in the book that leads into more complicated circuits. Consider a voltage source connected in series to first an ideal diode, and the diode is then connected (in series) to a capacitor. Let the input v_I be a sinusoid with a peak value V_p , and assume the...

Q: In the circut below, I is a dc current and v_s is a sinusoidal signal. capacitors C_1 and C_2 are very large; their function is to couple the signal to and from the diode, but block the dc current from flowing into the signal source or the load (not shown). Use the diode small-signal...

In Zener diodes, what is Rz? Could someone give me an idea how it is modeled, i.e. an equivalent circuit? Thanks.

For a PN junction diode, the total potential across the semiconductor equals the built-in potential minus the applied voltage. Phi = Phi(built-in)-Va(voltage applied) My question is what happens when the Va exceeds the Phi(built-in)? Will the Phi = negative? But how come they always...

http://www.sendspace.com/file/qhojgm can anybody pls show me how to determine numerically the diode current I(D) for t<0 and t>0 thanx

Does anyone have any information on diode failure? I'm interested in knowing how diodes can fail and what happens when they do fail. Specifically, what conditions of a diode will cause it to fail to be a closed circuit either direction criteria (like, become as useful as a wire)?