Diodes are semiconductor components made from a P-type and N-type silicon material, that allows current to only flow in one direction.

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How the Depletion Region is shrinked when Diode is in forward biased?

I would like to know why does the depletion region gets shrinked when a potential is given to a diode(Forward Bias).Is it because we have given a higher voltage than the voltage of the depletion ...
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72 views

Dark current of photodiode gets higher after heating, why?

I'm doing some experiments using photodiodes. I raised the temperature to about 1000 degree Celsius for 1 second with melting AuSn near the PIN junction. Then the dark current of photodiode is higher ...
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38 views

Will a tvs diode help my relay with inductive loads?

I am not an EE, so please be gentle! I will obviously get a certified EE to review my design before anyone else touches this so please assume that I know enough to at least be safe with 120VAC and am ...
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1answer
41 views

Load lines and Esaki diodes

I wanted to check something I was working on, and it's an assignment so I don't want the answer, I just want to know if I am approaching it right. I have an esaki diode. I have a curve (the s-curve ...
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2answers
54 views

Long term effect of over-voltage on clamping diodes and ADC reference voltage

I am contemplating building a small voltage/current monitoring circuit that needs to monitor a wide range of voltages and currents. Currents will just be a single low-side shunt. Monitoring will be ...
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66 views

How does reverse leakage current of a Schottky diode come into play with a SMPS?

Looking at diodes for a low power switch-mode power supply I'm designing. I'm not quite sure what the reverse leakage current value is, or if it's relevant in the component selection.
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What is the function of a diode connected to a GPIO?

I'm reading a schematic (done by a former employee) with a microcontroller, and I came across this circuit: What is the function of D1? Also, I think that R2 isn't necessary, because the control ...
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3answers
57 views

What is the Q-point of the zener diode?

Is the Q-point f the zener diode in figure equal to its breakdown voltage of 4 V ?
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1answer
48 views

Diode peak reverse recovery current

I'm trying to calculate the peak reverse recovery current \$I_{RM(REC)}\$ of a diode from information given on a typical diode datasheet (really what I want is the transit time TT, but the only piece ...
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1answer
37 views

Finding depletion region without built in potential

I am trying to solve a problem as to find the depletion region's width of a p+-n-n diode. I am given the width of the first n region and the doping of both n regions. Here is the problem: I ...
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40 views

Cannot find built in potential for this problem

I am doing some homework for my semiconductor physics class but cannot for the life of me find out how to continue... Here is the problem: A p+ n junction is formed in an n-type substrate with ND = ...
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2answers
125 views

Can I use a BC547 NPN transistor as a thermometer?

In the article Electronic Thermometers for Brewers Ken Schwartz talks about how to use a 2N4401 to create a diode thermometer: I attempted a similar setup with a BC547 transistor ( BC547 Transistor ...
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58 views

Silicon Diode problems

Hi guys i just learned a new topic last week and i was unsure on these questions. Does anyone know how to determine in the diagram if it's forward-biased or reverse-biased? How can i calculate the ...
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57 views

Anti-Parallel Diodes and H-Bridge

Does the anti-parallel diode forward voltage in a single phase inverter need to be lower than the body diode of the MOSFET? I have MOSFETs with a forward voltage of 1.2 Volts, and SiC diodes with a ...
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2answers
286 views

Another 'What is this component?' question

I have looked through all the other 'what is this component' questions and have not found my component. I am looking for the component in the red box. It is from a rectifier circuit off a 1973 9.8 hp ...
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39 views

How to analyze this diode circuit (zener regulated power supply)?

My solution: a- Full-cycle rectifier. b- V1(max) = vs(max) - VDo = A - Vdo = 15sqrt(2) - 0.7 = 20.5 v c- Vo = Vz = 15 v. d- Vr = Vp * T / 2RC = (15sqrt(2) - 0.7) * (1/60) / 2 * 100 * 1000 * ...
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2answers
56 views

How does a diode clamping circuit protect against overvoltage and ESD?

I always see this circuit when talking about overvoltage or ESD protection (does this circuit accomplish both, or just one?): However, I don't understand how it works. Say I put in 20V at Vpin. So ...
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28 views

Please help determining component specs of BQ76930 (BMS IC)

I was wondering if you guys could help me with some questions I have about the BQ76930 schematic (below, also found here: http://www.ti.com/product/bq76930 on page 42). How can I determine what ...
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2answers
52 views

How to measure the saturation current of a diode

Just wondering how with DC measurements you could measure a diodes saturation current and the Emission coefficient factor N. I was thinking a basic DC circuit varying the voltage taking voltage ...
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1answer
99 views

Will a flyback diode prevent an analog MCU input from being destroyed in this schematic?

Quick question: In this schematic, would D1 prevent high flyback voltages caused by the motor going into the voltage divider network and destroying pin A0 on the MCU? Pin A0 can only tolerate 5V max. ...
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1answer
72 views

Determining Vo in a circuit with diodes

This is the question: And this is my solution: (a) (b) When vI > 2.7, D1 is on and D2 is off. The circuit will look like: ...
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39 views

PWM and flyback diode dependency

I have to choose components for a pcb motor driver, there is a dependency that I have to take into account between the PWM frequency and the speed of the flyback diode? If yes, what it is? Thanks
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1answer
59 views

Analyzing a circuit with diodes connected in series

This is a problem with its solution: What I don't understand is how he replaced the three diodes with the voltage sources in DC-analysis or with the resistances in AC-analysis. What assumptions ...
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2answers
103 views

Diodes in series

simulate this circuit – Schematic created using CircuitLab The diodes are both made of Silicon. What will be the voltage across D1?. Edit: I voted for 0V only. But this is the ...
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1answer
90 views

Zener diodes in series

Hello, In this problem, i am not able to understand how I2 is getting replaced by I01. More over, will these zener diodes become ON as the applied voltage is less than Vz? Thanks in advance.
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46 views

What should I do with the unused diode in the SOT-323-3 (SC-70-3) package?

I'm planning to use one of this diode in my circuit. But the package contains two of them. I chose it mainly because of its 3ns reverse recovery time. How do I use them in my circuit? I have three ...
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81 views

Need help identifying a strange symbol in a wiring diagram

I have this simple wiring diagram for an old tractor, and there are some symbols that look almost like diodes, but not quite. I have highlighted most of them in red in the attached image. Do these ...
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60 views

Zener Diode Minimum Input Voltage

My question is with regard to establishing regulation using values taken off the characteristic curve. I have \$I_{kn}\$ = 1.8mA and \$V_z\$ = -8.2V. How can I determine the minimum input voltage for ...
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33 views

555 timing formula when the diode forward voltage drop is not neglected

(Image Sources) In this modified astable multivibrator circuit the forward voltage drop of the diode D1 is always ignored, and the timing formulas are given as $$ t_1 = \ln(2)R_1C_1, \quad t_2 = ...
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1answer
92 views

Using diodes to mix 2 audio signals into one set of speakers

I have the audio output of 2 computers connected to only one set of speakers. Each computer uses one of these external USB sound cards: And I use this splitter cable to wire the signals together: ...
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1answer
530 views

Do serially connected diodes share equal reverse current?

If I place three cheap 200 V rated diodes across a 500 V supply instead of one expensive diode, is the system guarantied to work correctly? My worry is the situation at which two of the diodes share ...
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1answer
48 views

Correct use of diodes in car stereo

Could I check my use of diodes in the following circuit? I'm wiring a new car stereo head unit into my motorhome (RV). I'm going to use most of the standard radio harness connections. However I ...
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3answers
72 views

Which diode to use on my RC switch debounce circuit?

I am choosing parts to build an analog RC switch debounce circuit. I plan to implement the circuit described here: http://www.ganssle.com/debouncing-pt2.htm (see "An RC Debouncer"). These are the ...
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1answer
36 views

Analyzing input/output characteristics of a diode circuit

In "Fundamentals of Microelectronics" textbook. The question number 27 of chapter 3 is: The part b of the question is: And the solution of b from the solution manual of this textbook is: Can ...
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1answer
55 views

How will the diode act after its junction is penetrated?

Above is a circuit diagram with 2 sources V1 and V2, a switch SW, a diode D1 and a resistor R1. The points X,Y,A,B,C,D,E,F are terminals of the components indicated with red dots. If the switch is ...
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87 views

Diodes block voltage?

I understand the basics of a diode, a diode allows current to flow in only one direction, but how? By blocking any opposing voltages source so that no current can flow in opposition? And of course, a ...
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108 views

Will the current flow through the diode?

This question originates from a difficulty to understand fly-back diode current in DC motors. In the above figure which logic is ok: 1) 9V-2V = 7V, so diode is reverse biased and current will not ...
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1answer
151 views

Analyzing circuits with diodes

In "Fundamentals of Microelectronics" textbook. The question number 25 of chapter 3 is: This is part c of the question: And this is the solution of part c from the solution manual: For the ...
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0answers
70 views

Input/output characteristics for this diode circuit

Given this circuit: Assume VB = 2V, constant-voltage drop model, and VDo = 0.7V. How to plot input/output characteristics? Here is my try: When the diode is on, we replace the diode with a ...
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2answers
69 views

Getting square impulses from square wave input

I can't get this problem right... This problem was given by my professor as a possible exam question. I took a considerable amount of time thinking in it, but I'm yet unable to solve it. The problem ...
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1answer
70 views

Metal semiconductor contacts

I’m headed back to the CNF (http://www.cnf.cornell.edu/) shortly. It’s a user clean room facility for semiconductor processing. My goal is to make some very simple samples, for use in student teaching ...
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1answer
110 views

Specification Requirements for a TVS Diode

I want to add a transient-voltage-suppression (TVS) diode to my design, but am getting confused about the specifics around Maximum Clamping Voltage, Maximum Peak Pulse Current and Minimum Breakdown ...
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2answers
151 views

Voltage not dropping in circuit

This schematic shows the circuit that I'm trying to build. At the moment I'm not using V2, as I'm having a problem with V1. From my understanding the diode should drop the voltage by about 0.7V, and ...
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44 views

Max peak to peak swing across ES without any clipping distortion?

This is an exam problem in which my instructor gave the answers but no work. Any one has an idea of how to solve it;FOM(figure of merit)= 25/125, RL=15 ohms, Rx=250 ohms, r1,r2,vee,vcc, are not given. ...
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3answers
61 views

Analyzing a circuit with diodes

In this circuit: Assuming ideal diodes We have 8 combinations of assumptions. I have proved that 5 of them are wrong. The three remaining assumptions are: All diodes are on. D1 is on, D2 is off, ...
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4answers
184 views

How to calculate Vx in this circuit?

In this circuit: Assuming ideal diodes We are required to calculate VD1, VD2, ID1, and ID2. If I assume that D1 is off and D2 is on which is a wrong assumption (as I think). How I prove that it ...
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6answers
164 views

How to calculate Vo in this circuit?

In this circuit: The diode is an ideal diode The diode is on since V(anode) > V(cathode) and then we replace it by a short circuit. Now, how to calculate Vo when two sources are existed? I = (10 ...
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3answers
331 views

How do I analyze this circuit with diodes?

If diodes in this circuit are ideal diodes: I'm making assumptions to solve this circuit for I and Vo but I have some questions: 1. What is the voltage at the cathode of the upper diode if the ...
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1answer
56 views

How do you determine graded versus abrupt diode junction types?

The problem When a diode is reverse biased with 8V, it has a junction capacitance of 15pF. When the reverse biased is increased to 12V, the capacitance drops to 13.05pF. Find whether it's abrupt or ...
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1answer
56 views

Sedra and Smith Example 3.2

Problem: Assuming that diodes are ideal, find I and V. This is a worked example in the textbook and it says that if you assume both diodes to be conducting then V=0 and VB=0 (nodal voltage at B). ...