Questions tagged [diode-clamp]

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41 views

Feedback on converting signal from 3.5mm jack to ADC on STM32 Bluepill

I'd like some feedback on my circuit. My goal is to convert an audio signal coming out of my laptop's 3.5mm jack (using a sin generator at max volume gives me about a ±1.5V wave) to digital using the ...
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2answers
65 views

Is ADC over-voltage protection needed when input isn't external?

In a situation where an ADC is measuring an internal voltage node rather than an external input (where one has little control over input voltage), does one need to implement some over voltage ...
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1answer
99 views

How to create an LTspice model for 1N4733A Zener Diode?

I'm new to LTspice. I'm using EveryCircuit as a crutch and would like to run my circuit simulation in LTspice to compare simulation results. I've built a basic circuit to understand how a zener diode ...
2
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1answer
179 views

Can I assume input protection diodes in all modern ICs, even when not mentioned in the datasheet?

I use the A3906 motor driver on a board supplied by 8V. The µC on the board is supplied by 3.3V and is connected to the A3906 via the logic pins. I realised this is a potential pitfall, when supplying ...
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1answer
72 views

Clamper Circuit Without A Resistor Analysis

simulate this circuit – Schematic created using CircuitLab We were given this clamping circuit and were tasked to plot Vc and Vout for varying input. The only given quantities are the forward ...
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3answers
66 views

Best design practice for relying on IC input diode current clamping?

I have a question about what the "best design practice is" for using ICs with current clamping diodes. Take for example the following IC: CD74AC251M (datasheet : https://www.digikey.com/...
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1answer
67 views

How do these Zener diodes limit the maximum voltage seen by other circuit components?

This schematic is given in Texas Instrument's AN-1533 Application Note (Over Voltage Protection Circuit for Automotive Load Dump) On page 4, the author says that the D3 Zener prevents the cathode of ...
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1answer
55 views

Use of clamp diode in ULN2003A

I'm planning to use a ULN2003A 7-channel Darlington driver (datasheet) to control 4 to 7 LEDs in common-anode configuration from a Teensy MCU: (The "trident" is a common-anode RGB LED). The ...
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2answers
61 views

How to select clamping diodes

I have a current sense amplifier (TI INA303, the 50V/V gain version) that I want to read with a microcontroller. I've looked all over the place trying to find how to select the proper clamping diodes ...
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3answers
83 views

Class C Amplifier: Calculating the base resistor

I've built a Class C amplifier for educational purposes and believe I understand the major concepts on how it works. The only piece I'm struggling with is how to calculate for the base resistor. From ...
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1answer
44 views

USB supply protection using shotkey diode

Here is the atached schematic of the clamping diode condition. Isolated the connection to contoller and kept the end open. When USB input is varied above 5V the expected output is diode cathode ...
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1answer
27 views

Diode voltage for small signal model what is the small signal component v_d [closed]

What is the small signal component v_d in this graph? Since they say \$V_D = v_D + v_d \$
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1answer
51 views

Understanding TVS diodes in this application

From this Reference Design you can see they use two TVS diodes at the gate of the first FET to clamp voltages greater than 500V. They do the same in this other Reference Design. So basically my ...
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92 views

Electrostatic protection - input and output ESD protection added to op amp w/built-in ESD

I have an op amp circuit using the OPA2626 that has a built-in input/output ESD protection of +/-3000V human body model. The circuit is 3.3V single supply, non-inverting, with only an external ...
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2answers
101 views

How to protect an input from ESD?

I would like to protect the input of a sensor (reference : MAX30001) from ESD. In the datasheet, they say that the absolute maximum rating of this input is -0.3 V < Vinput < 2 V. Do I have ...
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1answer
28 views

Understanding this clamp network

The circuit below is from this Reference Design. I want to understand the clamp network at the input. How is VGS of Q1 kept at a safe level?
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2answers
559 views

What is the purpose of clamping the gate and source of a mosfet

Is clamping the gate and source of a MOSFET really important? I have seen this in some articles and some datasheets of MOSFETs where they have built in clamping. As far as i know they are used for ...
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1answer
39 views

This clamping circuit output is -ve compared to what is expected?

Clock Pulse of Vpeak =10. Providing that the first cycle is -ve why does the output in first is -20 then 0 then -20 and so on? I expected it to be 0 and 20.
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73 views

Polarity of input signal and capacitor in voltage clamper

I am stuck at understanding how voltages add up in a voltage clamper, reading through Learning About Electronics - Diode Clamper and All About Circuits - Voltage Clamper, and also YouTube a few ...
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1answer
94 views

Buck regulator maximum supply voltage VS. voltage spikes at input where we have a TVS diode

Currently I'm using a buck switching regulator AOZ1284PI of Alpha & Omega Semiconductor to generate a 5V supply from a 12V input of a lead-acid sealed battery, and I plan to use AOZ1284PI again on ...
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2answers
69 views

How is dc restorer circuit used for PWM demodulation/detection?

In the Microelectronics Circuits textbook by Sedra & Smith, it is said that: As an application, consider a pulse signal being transmitted through a capacitively coupled or ac-coupled system. ...
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1answer
72 views

Ethernet POE voltage measurement to determine Voltage clamping between line ot Ground

I am planning on using a tvs diode to clamp power peak to protect network switch; the Port is POE. The issue is that when I measure the voltage of ethernet line to ground, I get around 0.6V. When I ...
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1answer
824 views

How to choose the correct TVS diode and how to size it?

So I was thinking about transient suppression and I found TVS diodes. I was wondering how to choose the correct TVS diode since they have 3 voltage parameters: Vc --> clamping voltage, voltage I ...
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1answer
70 views

Designing a clipper circuit

Design a clipper circuit using 1N4148 general purpose diodes and a R = 1 kΩ to clip input signal voltages that are above 5.7 V or less than −0.7 V. Below is my schematic in which Vo<=Vdo + 5V and ...
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1answer
192 views

resistor placement for zener diode for over voltage protection

i have searched in over voltage protection (like mosfet ) , i wanted to use zener diode parallel so it wont dissipate power unless in over voltage protection , but its power is low so i read that i ...
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1answer
104 views

Voltage clamping for nixie tube driver

I want to design a nixie clock based on a high voltage shift register: the HV5530. I don't what to multiplex the tubes to avoid loss in brightness. My idea is to leave the anodes powered all the time ...
2
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1answer
85 views

Clamp a D/A to prevent output below 0V

I am using a USB D/A converter to drive a high-voltage op-amp with a signal between 0 and 3V at 10 kHz. The D/A I am using is capable of outputting between -10 and +10 and unfortunately seems to ...
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1answer
422 views

GPIO over voltage input protection

I want to design a circuit that can protect GPIO of the microcontroller from high voltages.the GPIO connects externally to mechanical switch. So my approach was to use zener diode to clamp the high ...
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1answer
2k views

Analog input over-voltage protection using Schottky and Zener Diodes. Can it work?

I'm developing an analog input module based on TI's ADS8668 and want to protect the input channels from over-voltage. According to the datasheet, each analog input channel withstands voltages from -...
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0answers
130 views

ESD Diode - clamping voltage

I'm trying to replace an existing ESD diode(PESD1CAN) in my application CAN circuitry due to some reasons, I've found an alternative ESD diode(RSB27C2), but compared to the diode that I already have ...
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1answer
439 views

How do I size a zener diode for use as a freewheel diode for a ZVS induction heater?

My electronics experience is "hobbyist" and I'm in some new territory with this question, so forgive me if this question turns out to have an easy answer or prove to be dumb. I have a basic ZVS ...
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1answer
236 views

Over voltage protection for a buck controller 24V in. 4-5V out

Please see Image below, if the output votlage here is 4-5V with current out 3A-15A(depending on LOAD). Could I stick a Zener diode to clamp any over voltages to protect the load from over voltages? ...
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3answers
183 views

Over-voltage protection system for a 7 - 20 A Load with 4 - 5.5 V output from PSU

The power supply used on the product, is a DC-DC buck controller 24 V in (3 - 5.5 V out). I need some suggestions to help protect a load (LED Display) which draws roughly 5 - 15 A the power supply on ...
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2answers
185 views

Question about diode clamper

I have 2 problems with diode clampers that I don't understand First, in this circuit for example: In the positive half cycle, the voltage across the diode is the diode drop of 0.7 V Then the ...
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2answers
361 views

How does diode clamp protection work?

I am not able to understand how diode clamp protection works. Considering the diode clamp protection as shown in Figure 1: When the input voltage (Vin) becomes more than power supply voltage (Vss = ...
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4answers
773 views

Clamping negative voltage on comparator input (LM393)

I need to compare a AC voltage against a reference voltage. I'm only interested in the positive part of the cycle so I need to clamp the negative part of the cycle to protect the comparator input. I ...
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1answer
98 views

During DC restoration of a video signal how is the first sync pulse detected?

DC restoration of an AC coupled video signal can be performed by clamping to some reference voltage, during the horizontal sync periods of the video. This all seems fine in a running system, when the ...
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3answers
354 views

If you were to add “DC offset” with a clamp, can you easily remove it afterwards?

I don't have a circuit right now, but let's say you wanted to add DC offset to a signal (ex. to prepare a signal for an Op amp stage) but then afterwards center that signal on 0v. Is this possible ...
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0answers
173 views

Use of DC source in Zener clamping circuit

A question in my engineering degree asked me to design a clamp circuit that gives a 10V 50Hz AC signal a +5V DC bias. I designed the following circuit as my answer: I assumed 0.6V forward drop for ...
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1answer
1k views

12V 12A resettable crowbar circuit

The idea is to protect the input stage of a control card from improper power supply connection. The power supply is a standard desktop AC-DC power adapter (Meanwell GST160A12) with inbuilt shortcut, ...
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2answers
218 views

Diode clamp circuit question

I understand the use of diodes as switches or "clamp circuits", however I needed a little clarification in this diagram, taken from the site https://www3.nd.edu/~lemmon/courses/ee224/web-manual/web-...
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2answers
174 views

OpAmp clamping circuit not working for a Pulse voltage reference in PSpice

So, we had an analog electronics lab exam today where we had to generate a waveform: I wrote the PSpice code, using a clamper circuit (in hindsight a summer was the best option, but whatever). The ...
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4answers
514 views

Learning the Art of Electronics - diode clamp

Working through Learning the Art of Electronics, Hayes T, I'm stuck trying to build the diode clamp in Figure 3L.7 on page 137, as below: The text says to, "Drive it with a sinewave from your ...
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3answers
2k views

12 V input on 3.3 V GPIO, TVS pulled down or Schottky pull up?

I am building my own PLC that has to accept permanent inputs of up to 30 V DC into a STM32F with 3.3 V inputs. The switched input will have to work with 8-30 V, but 90% of the time the ...
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1answer
697 views

Principle of diode in DRL AND gate

The explanation (from https://en.wikipedia.org/wiki/Diode_logic) states that R is connected to +12 volts to provide the forward bias current for the diodes and current for output drive. If all ...
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0answers
135 views

Conceptual confusion about voltage multiplier circuits

I can do circuit analysis of the half-wave series multiplier (also called Villard or Greinacher cascade or Cockcroft-Walton multiplier) and see that it works, but I have several conceptual confusions ...
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1answer
233 views

Clamper for easy DC-restore in video-composite

I'm unsure how to properly design a simple clamper in a video circuit like this: The capacitor should be there to avoid any DC offset flowing into the X1 primary loop. I don't know if I can treat the ...
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2answers
220 views

What is the difference between clamping a input signal at X volts and clamping a input signal by X volts

I know that the total swing of the signal remains the same.I don't know how the circuit will be designed when it's asked to clamp the signal at X volts. Will the lower peak be at X volts? Or the ...
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2answers
713 views

Clamping diode between supply and output of an opamp

I am trying to create a test board for Apex MP38. I am following their own evaluation kit design and noticed there are 2 clamping diodes between the OpAmp's output and the positive and negative rails: ...
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3answers
1k views

Internal clamping circuit at the input pins of an MCU

I understand that the internally two diodes exist at the input of a microcontroller and one end of it is connected to Vdd and the other end of the second diode is connected to ground and when the ...