# Questions tagged [transient]

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### DC-DC converter cause PC GPU computer to shut down

I am currently trying to power up a edge GPU computer that runs on 12-19 V and is rated for 60 W. Whenever I start to overclock my computer to run some machine learning stuff, the computer will just ...
133 views

### Getting the transfer function of a parallel RC circuit. Am I allowed to simplify/remove the component I am trying to solve for?

simulate this circuit – Schematic created using CircuitLab Say we have that simple parallel rc circuit and we were tasked to get the transfer function of V_c(s)/V_i(s). We were told that it is ...
77 views

### Find the phase angle of the of the sinusoidal input that will make the natural response zero

Say we have a simple rl circuit with R = 0.5 ohms, L = 0.1 H and the sinusoidal input of : $$V_s = 13800√2sin(120πt+β)$$ Then we were tasked to: I know the form of the solution of i(t) would look ...
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### Initial Conditions and Parallel Resonant Circuit Problem

simulate this circuit – Schematic created using CircuitLab I already did my own solution but I just want to check if I got everything right, especially in determining the initial conditions. ...
45 views

### LTSpice AC analysis and DC analysis don't agree?

I have a simple circuit pi circuit. When I do the math and subsequently run the simulation on LTSpice, I get a similar answer - the resonance occurs at f= 217447Hz (math), 217450(LSpice). The error ...
33 views

### How do I solve this question?

In the given figure, the steady state is reached with the switch open. At t = 0, the switch is closed. Find Vc(t) for t > 0. How do I proceed solving this question? So far, I've tried applying KVL ...
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### Calculation of the capacitor value across the base and emitter to avoid unexpected turn ON of transistor

There is a design recommendation to add a capacitor across the base and emitter of Q2 to avoid the unwanted/unexpected turn ON of Q2. Calculation of new capacitor across Vbe: My questions : Can ...
25 views

### Lithium ion battery pack busbar thermal calculation

I am designing busbars for lithium-ion battery pack which is 14-series, 9-parallel combination. We have taken busbars sizes as per the industry standard current density 3A/mm2. (Total current 48 A, ...
42 views

### Circuit analysis of series diode clipper circuit

simulate this circuit – Schematic created using CircuitLab I'm really unsure how to start with this. The instructions said to find Vin such that Vout will be 0.5Vin. The only given is Vd = 0.7 ...
60 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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### Reversed and Forward Biased Diodes in Parallel

simulate this circuit – Schematic created using CircuitLab We were tasked to find the node voltage V. My analysys: The way I approached this problem is to first make the assumptions of the ...
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### Determining Vo in a diode circuit using iterative analysis

simulate this circuit – Schematic created using CircuitLab Say we have this circuit. Then we were asked to find Vo using iterative analysis. We were told to stop when the estimate is accurate ...
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### Resistor in parallel with a short circuit. Will current flow through it?

I'm trying to find the Isc of this circuit seen by the capacitor at t > 0 so I could find the Rth and get the circuit's time constant. If I make the capacitor a short circuit, it will be in ...
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### Step response of voltage inverter and RC filter homework question

This is my solution so far: Vth would simply be the output of the inverting op amp which is Vth = -(Rf/Ri)Vi Rth would simply be R2 || R3. simulate this circuit – Schematic created using ...
117 views

### Can open circuits have 0 potential difference?

So I do know that the capacitor will be an open circuit at t < 0 (also at t > 0) since it is connected to a DC source. But since at t < 0, the switch is also open, meaning i will have another ...
39 views

### Transient current value

I am working on a SMPS and wanted to size a varistor at the input to protect the rectifier against transient overvoltage (let's say a 1 ms surge). However, by looking at datasheets the maximum ...
86 views

### Transient analysis of a marx generator

I wanted to mathematically find the voltage on all capacitors in a Marx generator circuit. I thought that each capacitor would be charged like its own RC charging circuit. I came up with these ...
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### Help with finding the value of current through a resistor in an RL circuit at a specific point in time

This is a homework problem for my circuit analysis class. I can't figure out what the heck I did wrong. I know the solution to the relevant ODE is of the form I(t)=k1+k2*e^(-t/(R/L)), so I just need ...
66 views

### Time constant of 2nd order system

Why there is no general definition of time constant for 2nd or higher order systems , while 1st order systems have a proper definition of time constant. is Time constant defined for every systems ...
211 views

### Zener diode response time

I have the below circuit: Forward diode D0002 - Datasheet SIJ series for reverse protection and C0001-C0004 capacitors for ESD protection. Zener diode - Datasheet - 36V reverse breakdown. Question : ...
29 views

### Transient and steady state of marginally stable system

I know that if a system is asymptotically stable then after infinite time its output contains only characteristic of input signal and it is also known as steady state and there are no transient ...
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### Transient solution of current in circuit with two coupled inductors, with resistances

Circuit in question is given below. I want to find why I can not get the same current waveform as PSpice gives me. Basically I want to calculate formula for i1(t) by hand and get something as close ...
50 views

### Automotive reverse current and transient protection

Adding reverse polarity and reverse current protection to an automotive circuit seems a bit challenging, especially when driving loads in the 10A range (e.g. seat heater). Diodes on the power line ...
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### What happens to the steady state of the series RC circuit if changes happen to any circuit element?

The question that I'm trying to understand is the following: In any series RC circuit that is in steady state, WHEN any of the elements changes (R, C, or applied voltage), the following will happen ...
33 views

### transient analysis inductor voltage [closed]

In transient analysis, when at steady state, the inductors behave like a short circuit. Can I apply the voltage divider rule, to find the voltage drop across the inductors in series?
56 views

### How to design a low pass filter for Fourier Square Wave

I am trying to create a low pass filter with a cut-off frequency of 100Hz to retrieve a sine wave from a Fourier Square Wave. I am only able to achieve a sine wave with transients. How can I edit my ...
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### How can I make LTSpice calculate the transient response starting from a time different than t=zero?

I'm creating a schematic and I'm trying to simulate it using LTSpice. However, my RC time constant is quite large, and I'd like Spice to simulate only from around 10ms onward. I know that if i set ....
43 views

### How to use the print step option in LTspice XVII?

I'm aware of the print_step option for transient analysis, but I can't seem to get it to work. I'm using LTspice XVII for windows 10 to simulate a DC DC converter for about 3s (It is necessary to do ...
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### LTSpice Consecutive Peaks

I'm trying to write a SPICE Directive that I can use to measure the consecutive peaks of an exponentially-decaying transient response but can't find any way to do so. I've tried adding RISE and TRIG/...
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### Given a constant R,C, and the input voltage at any time, what is the output of a low pass rc circuit?

In other words, what is the transient response Vo(t) of any arbitrary input signal for a continuous voltage input Vi(t) for a low pass filter? We can make some assumptions: A for any given Vo(t), ...
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### RC Circuit Transient Response

I was going through some questions on Transient Response of circuits. Then I encountered this question! Though, I was a bit confused at first, I initially approached in an intuitive way. My first ...
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### Transient Voltage Suppression Diode with no current limiting component

BATT= 16V 27V Rated TVS Diode spec - TVS Diode Datasheet The circuit : My questions: I want to understand what happens when the BATT voltage goes above the TVS diode clamping voltage. For both ...
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### Variable Gain Amplifier (VGA) Cadence Simulation [duplicate]

I'm designing an Amplifier (VGA). I'm using Cadence CMOS 180nm technology. How can I find the power up time and power down time (1% of final current)?
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### Transient voltage through an inductor in a step RL circuit

The current through the inductor in the above circuit is 2 A at t = 0- when it is short-circuited, since u(-t) = 1 for t < 0 and 0 for t > 0. At t = ∞ the current is 0 A, so I(t) should equal 2e^-...
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### BIL, Dielectric Breakdown, Shrink Wrap, and Safety. Is there a resource for this information?

I am currently working with a system that produces high voltage transients for system testing, and have some cables that need to be made/modified to work with some new equipment. The operating ...
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### How to get instantaneous voltages in everycircuit?

What i want to do is to add scope probes to nodes between resistors and then run a transient analysis for 5ms in order to see the measured voltages for those nodes at exactly 1.25ms. Is there any way ...
50 views

### How do I measure the duration of transient from a transient analysis graph?

I've assembled the following circuit: And the following graph is the output: (Green: Voltage across C) (Red: Supply Voltage) How do I measure the transient duration from the graph? Is it the same as ...
37 views

### Inductor Current Equation

i recently came across an exercise involving solving for the energy released in a freewheeling diode. This is the circuit: The problem is that i'm not understanding the current equations for the ...
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### 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.
140 views

### Two charged capacitors connected in series

simulate this circuit – Schematic created using CircuitLab The circuit has the initial condition as shown in figure. What will Vfinal be when SW3 and SW2 are open but SW1 is closed.
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### Which characteristic of a BJT determines the timing in the following given application?

I currently face a question about the BJT circuit given here: We see a 2N3904 transistor with constant base current of 2 mA. A switch seperates a 15 V/20 ohm source from the collector of said ...
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### ESP32: Power rail transient when using SPI on battery

Working on a small datalogger project using an ESP32-WROOOM that involves an analog sensor signal being recorded and saved to SD card. Having a big power rail spike issue that has been isolated down ...
110 views

### What happens to the voltage across an inductor as the frequency increases? [closed]

My professor told us before that when DC is passed through an inductor and reaches t = infinity the element becomes open. How does this happen? By the way: the inductor has no charge at t = 0s.
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### How to analyze a capacitor in series to a capacitor and resistor in parallel?

I would like to do a transient analysis on this circuit but I don't know how to use those formulas $$V(t)=V_0*(1-e^{\frac{-t}{R*C}})$$ $$I(t)=\frac{V_0}{R}*e^{\frac{-t}{R*C}}$$ in this case. There ...
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### Are there any instruments that can be used to measure the stored energy across a capacitor?

Apologies if this a noob question but I was wondering if there was a way I could directly measure the energy across a capacitor in Multisim so that I can compare it with my analytical result.
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### surge voltage characteristics of ceramic capacitors

I am reading a datasheet from Murata for a ceramic capacitor. According to the datasheet: When AC voltage or pulse voltage is applied, the peak-to-peak voltage shall not exceed the rated DC ...