Diode Definition and 555 Threads

hii... you all know about IV Characteristic PIN diode.. I fabricate PIN diode and want to analysis my result.. what is the forward voltage drop for PIN diode? are the voltage fix o variable.. ??

Hello, I have recently had a lab on diode limiters and am a bit confused by the results. The circuit is seen in the picture below and I have obtained theoretical values for the Voltage output. The circuit is feed by a 16V sine wave with a frequency of 1kHz. Now I know when the sine wave is...

Hii... I already fabricated PIN diode using boron (P), Si (N-type), and phosphorus (N). For the method, I etching two contact at Si wafer then doping the boron and phosphorus... there are width I-region (Si) between the contact. A already measured the I-V characteristic of PIN diode but...

Hello, I have been given a homework problem about ideal diodes. The diagram is below. I need to find V and I. I have the solution (4 mA and 1V) however I am unsure as to why it is so. I would have set 5V at the node where the resistor and 3V diode meet therefore setting all the diodes to be...

Homework Statement The question I have been set is "Calculate the current in a diode when the forward voltage is 0.62V and the reverse saturation current is 10pa." Homework Equations I really have no idea how to begin solving this one. The only equation that I have been taught...

Diode should conduct electrons in one direction only. Why doesn`t it produce power at ambient temperature or any temp.?

Homework Statement Hi. I'm being asked to make a circuit to take the input waveform, on the left, and extract the output waveform on the right. In my circuit, I can only use basic diodes, resistors, and DC supplies of +10 and -10V. The Attempt at a Solution

Homework Statement Please refer to the picture [PLAIN]http://img337.imageshack.us/img337/7118/46864828.jpg Can anyone help me? Thanks.

Can anyone recommend a good laser diode that won't cause damage to the eye with prolonged exposure?

In forward bias the supplied voltage is distribute among the resistor and the diode (diode and resistor are connected in series) but in reverse bias the Current across the resistor remain zero because the conduction starts when very high voltage is supplied ...am i right ? but why the Voltage...

Homework Statement A zener diode runs off 10V and supplies 5V to a load that draws 100mA. The minumum zener current = 5mA. R = 47Ω What is the dissipation in the resistor if the output is short-circuited? Homework Equations None. The Attempt at a Solution Using R = V - Vz / Izmin...

Hi all, Can anyone brief some history and the Characteristics of SiC diode. I having difficulties to find the infomation about the SiC material. Beside that, how the Temparature related with the I-V curve (Eg: 200k, room temp,600k) and different between the Si and SiC at room temp? Thx.

Homework Statement Where can i study about those projects in which silicon and germanium use as a diode with their purpose in the appropriate project? The Attempt at a Solution I want the list of atleast 30 projects in which si & ge , i also wants to know for which purpose si & ge use in...

My teacher was talking about power supply voltage regulators. I cannot get why does a zener diode regulator's output voltage drops after the load current through it exceeds some critical current? thanks in advance :smile:

Homework Statement Determine the value of the ballast resistor is satisfactory if a 5Volt 0.5 watt zener diode is used in the circuit sorry can't upload a picture but basically VS = 15v min to 20v max R ballast = 90 ohms (series with zener) and R load (in parralel with Zener) is 50...

Homework Statement find current through each diode, suppose that they are ideal (use the second approach) [PLAIN]http://img30.imageshack.us/img30/102/86772682.jpg R is 10kohms The Attempt at a Solution a) (12-0.7)/10k = 1.13 mA b) 0 because diode will be open, actually i added up the two...

Homework Statement We are given a peak-to-peak voltage of 10. I am attempting to explain the following characteristics: 1) With a larger forward bias (and a corresponding smaller reverse bias), the storage time increases. 2) With higher frequency, the storage time decreases...

what are the differences between Zener diode and pn junction diode characteristics CURVE?** the breakdown process is easier in terms of breakdown voltage for zener diode. as, it is highly doped.

I need to know what diode to use for the following spec: I need to use this for my motorcycle. I have 2 xenon headlamps working on my bike but 1 lamp lits up for low beam and the other for high beam, now I need to light up both which means I've got to use a diode. Need to know which is the...

So I have this lighting fixture that I'm trying to plug into an outlet. I took the diode and tried connecting it to and old phone plug. This didn't work. [PLAIN]http://img52.imageshack.us/img52/6803/20100608201408.jpg I was wondering if plugging this into an outlet is even possible, and...

doubt in semiconductor diode theory ? hello friends :smile:... in this picture diode is forward biased. positive terminal of battery repel holes n negative repel electrons , finaly electrons n holes recombine n eliminate each other. but its said that current flow is due to electrons ...

Homework Statement I have the following circuit: [PLAIN]http://elementdesign.sk/dioda.jpg I would need to calculate the current and voltage through the diode. I now that I can calculate the current by the following formula: I=I_{0}(e^{U/U_{0}}-1) I know that I_{0}=10^{-17} and U_{0}=20mV...

why diode has such a sign?? by the bottom sketch we have the diode to be short circuit but if we look at the upper sketch we see that the current (ie electrons) flows from the plus p side for diode to be short circuit we ned to have the electrons flow to the n side not to the p side...

Hello, I was hoping someone could answer my question. So i am wondering ..lets say i have a p-n diode. What happens if i increase the dose of the p-side of this junction . What happens to the reverse breakdown of this diode? People say that the reverse breakdown decreases when you increase...

Homework Statement revered members, this circuit i have attached is for voltage regulation using zener diode. applying kirchhoffs current law i get current through resistance R is IR=IZ+ IL And the voltage drop across the resistance R is V-VOUT HOW this equation of voltage drop is...

i am designing a stepped attenuator using pin diode as a switch in microwave office. i am having difficulty in using pin diode as a switch. i knw it is operate in forward bias and open in reverse bias. if i am giving a rf signal between 300 Mhz to 3 Ghz then how can i switch it to reverse bias...

Homework Statement A pn junction diode has saturation current Is= 1e-12 A. What is the current through this diode if a positive voltage 0.68 V is applied to it? (Unit: A) Homework Equations I=Is(e(Vd)/(Vt))-1) The Attempt at a Solution I don't even know where to begin, but i just...

Probably a really stupid question but for a pn diode in complete forward bias i.e 6volts (switch on 0.7volts), does it behave like a normal resistor or is it a squared resistance till say 200 volts and is there a forward voltage breakdown mechanism. I can only find I V curves that got to about...

Homework Statement I have looked in all my textbooks but i can't find anything about this diode or what it does? Here is the symbol of that diode (from a City & Guilds past exam paper): http://img5.immage.de/2204diode.jpg Homework Equations It's just an unknown diode symbol to me, and there...

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For a lab we built the following circuit. Our photo diode was receiving a blinking signal which our op amp made visible on a DVM. I do not understand the purpose of the capacitors attached to the power rail. So far I understand how negative feed back with the Rf resistor controls the amount...

My question is related to the leakage current occurring in a diode when connected in reverse bias mode. When the diode is forward biased, the source voltage first neutralizes the barrier potential and then the flow of current occurs. However, I am not able to understand how the current due...

small signal diode modelling i understand what it is but when i get asked a question like: if vin(t)=2.5+cos(2*pi*100*t) for 0<t<30 use the small signal model of the diode to predict the output voltage of the circuit i have added. assume the opamp is ideal R=2000 Is=10e-16 so i know...

My question is related to the flow of current in a diode. In a metal, the current is completely due to the flow of electrons (Eventhough, we always consider the conventional direction for current). Whereas, the current in diode is said to be the sum of the component of current due to holes and...

Yo yo yo. What up homies? I am once again humbled to be in need of your gracious assistance. I did all the work this time. I would just like some fresh minds to double check. I am driving two relays with http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=FMMT493CT-ND" is the...

Hi, This is my first encouter with anything to do with RF design. I'm trying to design an RF PIN diode switch to meet certain specifications. I'm having considerable difficulty putting together a circuit schematic that will accomplish this. My specs are: Center frequency: 15GHz Bandwidth...

First post, after tinkering with electronics so long I just had to join a physics oriented forum. I'm trying to work out how I can get an input voltage to "clip" at a certain level. I start by imagining an ideal diode (no current on reverse bias, infinite current on forward bias). My setup...

Homework Statement Consider the following power supply circuit, which uses typical component values. The diodes have a forward drop of 0.6V each. Transformer voltages are RMS (root mean square). http://img294.imageshack.us/img294/1665/70454661.png a. Determine the DC output voltage...

I have some questions about how silicon diode works, specifically as a ionizing radiation measurement instrument. I will write what my understanding is so far from different textbooks/websites (please comment whether I have it correct) and also write question where I get confused. Thank you...

Hello experts, :!) The following is a diagram posted by a learned forummer and i like to find out what function does the diode serve for the coil of the relay. http://www.flickr.com/photos/46348930@N03/4400589307/ Thanks for reading my question. regards Ramone

EDIT: PROBLEM SOLVED! I found a model on a website of the manufacturer! Next, I need to hunt down this 5.1 V Zener. Hey. I'm designing a full-wave bridge rectifier regulated by a Zener, and on of the project requirements is an LTspice simulation(not to mention it's a good place to start before...

http://img38.imageshack.us/img38/6127/88280233.jpg I circled the given answer. The problem asks for I and V. I guess the bottom diode shorts first and then that makes the top two diodes be open circuited. Is there any good explanation on why the circuit behaves like that? I guess it comes...

Homework Statement You have a series circuit consisting of a dc power supply, a 90 ohm resistor and a diode. If the measured current in the circuit is 136 mA, and the saturation current for the diode is 0.006 mA, what is the voltage drop across the diode? Assume the diode temperature is 300...

Homework Statement Here is a link to two figures I drew from a book I am using http://www.flickr.com/photos/96575810@N00/4339202724/sizes/o/ These figures are assuming ideal diodes (no voltage drop, no resistance). In this example, on the left hand circuit, the voltage is listed as +3v...

1. The question. Suppose that the input frequency into a full-wave diode bridge rectifier is 60Hz, and suppose that the RC time constant of the network filter capacitor and the load resistance is 10ms. Estimate the time after the peak input voltage when the diode shuts off. The circuit looks...

I have to answer this question in front of the class tomorrow. Been struggling all weekend with no joy. Question: Determine the minimum and maximum loads currents for which the zener diode on the figure below will maintain regulation. What is the minimum RL that can be used. Vz=12v...

How does a forward biased p-n junction display capacitive effect? I understand that a reverse biased diode can exhibit capacitance with the depletion region acting as a dielectric, but in a forward biased junction, depletion region does not exist,so how does it show capacitive behaviour?

I was wondering what the effects are if any if I connect a 17V DC source in parallel with a 9 V battery but the 9 V battery has a diode that prevents current from flowing into it. Thanks

Hello, Here is my question: If we have a regular PN junction diode, which is forward biased we will observe the effect "injection", we will have more minority carriers than normal near the PN junction. I would like to ask you whether this "injection" is observed during the whole period...

i want to protect my transistor(working in saturation) from high incoming voltage... can a diode be used to protect it from the high voltage?