Stack Exchange Network

Stack Exchange network consists of 175 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.

Visit Stack Exchange

Questions tagged [passive-networks]

Use this tag for circuits that only contain passive components, such as resistors, capacitors, and inductors. This includes RC, RL, LC, and RLC circuits.

2
votes
1answer
43 views

Do we have a peak in an overdamped RLC circuit?

Consider the natural response of a parallel RLC Overdamped circuit, we're required to find the time it takes for the voltage across the Resistor to reach it's first peak. I got the equation for the ...
0
votes
1answer
34 views

Why do we not consider Thevenin Voltage source while dealing with Dependent sources in RLC circuits?

"If no controlling current or voltage associated with the dependent source is of interest, we may simply find the Thévenin equivalent connected to the inductor and capacitor." This is what's written ...
0
votes
0answers
24 views

Is the form of current response the same as the form of voltage response in a parallel RLC circuit?

I've tried looking for this answer in my textbook, what I'm confused by is that it says the response of the circuit? Does it mean both the voltage and the current response, or just voltage response ...
0
votes
0answers
40 views

Calculate U(t) when capacitor C1 charges C2 via a resistor R

simulate this circuit – Schematic created using CircuitLab The switch SW1 is activated at t=10s and charge from C1 is transferred to C2. The power supply charges continuously with 1kV 1mA. How ...
4
votes
1answer
116 views

Capacitors in parallel going negative

Interesting (maybe?) question here which I am struggling to answer. Hoping someone can help. I have a capacitor network; 5 caps in parallel and then two modules of that configuration connected in ...
0
votes
0answers
48 views

Distributed LC vs Distributed RC

The usual rule with LC circuits is to use the lumped model if the circuit is considerably smaller than the wavelength, or if the propagation time is considerably smaller than the rise time. With RC ...
0
votes
1answer
35 views

if settling time is smaller for underdamped case then why we call it underdamped - parallel rlc circuits?

Does less settling time means that the response dies out quickly? If so the settling time for a just correct Resistance such that the circuit is slightly underdamped is least, then it's most damped(...
0
votes
1answer
38 views

LC ringing on synchronous buck converter

I am working on a board that uses LTC3891 as a buck converter to step down 24V to 12V. There is quite a significant oscillation at the switching node, upstream to the inductor which I am curious about....
-1
votes
2answers
83 views

How to tackle circuit containing time variable resistor?

simulate this circuit – Schematic created using CircuitLab For instance above schematic find current as function of time in circuit above I studied it about months before and am not able to ...
0
votes
1answer
55 views

Mesh Analysis has failed to solve this circuit

I built the following circuit in LTSpice and found each mesh currents to be (which also matches the answer sheet provided by my professor): i1: 9A i2: 8A i3: 11A i4: -6A However, I am unable ...
0
votes
1answer
59 views

Quality factor of RLC circuit

I am trying to calculate the quality factor for the response curve of a series RLC circuit. I measured the voltage across the capacitor at several frequencies and calculated its ratio to the forcing ...
0
votes
2answers
38 views

transient analysis with time varying Resistance

As we know in frequency domain V(s)= I(s)Z(s) then in time domain it should be V(t)= I(t) Convolution Z(t) instead of V(t)= I(t)Z(t) ?
0
votes
3answers
66 views

Inductance value of an Isolation Transformer

There is a small isolation transformer 'L1' of 1:1 ratio as shown in the image. A 0-24V, 75kHz square wave is applied from push-pull mosfets stage at the 'V_SW' input of the circuit. I want to find ...
0
votes
1answer
71 views

How do I determine the impedance of Z in this circuit?

I have a circuit shown as follows: Known values: V1: 5 VRMS, F = 4kHz. V2: 0.5 VRMS @ -28.8 degrees. Impedance Z = r + L + C. How can Z be determined? I've attempted to solve this quickly, does ...
0
votes
1answer
72 views

RLC Low-Pass Filter with MATLAB

I'm trying to refresh my knowledge on RLC filters, and I'm using MATLAB to model it. Given an RLC circuit with the elements in series, taking the output at the capacitor should result in a 2nd-order ...
1
vote
1answer
45 views

Parallel RLC bandpass filter Bandwidth incorrect

I have been trying to create a bandpass filter with the cut-off frequency at \$\mathrm{200Hz}\$ and \$\mathrm{4800Hz}\$ I have managed to get the centre frequency to \$\mathrm{2500Hz}\$. The bandwidth ...
1
vote
1answer
58 views

Passive band-pass filter conceptual analysis

I'm trying to chain a high-pass filter and a low-pass passive filter together to form a band pass filter to illustrate how you can combine filters together, but I'm having issues trying to understand ...
0
votes
0answers
41 views

Finding initial conditions for a series RLC circuit

I am trying to find \$v(0^-)\$ and \$i(0^-)\$ for the step response of a series RLC shown above where R = 330 ohm. I know that at \$t = 0^-\$, the circuit is in steady state so that the inductor acts ...
2
votes
1answer
64 views

Network Resistance equivalent

simulate this circuit – Schematic created using CircuitLab I am having difficulties in simplifying and finding the equivalent for the circuit shown. Can someone guide me to the appropriate ...
1
vote
1answer
36 views

Finding the time constant of an RL circuit

I've the following circuit: simulate this circuit – Schematic created using CircuitLab And I've to find the time-constant of the voltage across the inductor. I did the following: The voltage ...
3
votes
1answer
72 views

What would be the consequence of the inductor saturating?

The following is a section from a book where it is talking about decoupling by LRC at supply terminals. I highlighted the sentence where I didnt understand: I read that if an inductor has an iron ...
2
votes
2answers
83 views

Find Voltage of inductor in LC series circuit with resistor in parallel

I have a LC resonance circuit with a resistor between the capacitor and inductor: simulate this circuit – Schematic created using CircuitLab I want to find the Voltage at L1, more specifically ...
5
votes
3answers
2k views

Thevenin Equivalent Voltage: why ignore the 3-kΩ resistor?

In order to find the Thevenin voltage here, why is it that the 3k Οhm resistor is ignored and no current goes through it? (hence \$V_{TH}=8mA \cdot 7kΩ = 56V\$)
0
votes
2answers
48 views

How to smooth changes in *current* in a current meter?

I have a milliammeter I'd like to debounce with an \$f_c\$ of say 0.1 Hz (10 s) to where it reads a mean average rather than however fast the needle moves, dampened only by physics. Vcc is about 8-9 V ...
0
votes
0answers
47 views

RLC circuit with intial conditions

The circuit I have is given by the following schematic: simulate this circuit – Schematic created using CircuitLab I know a few things: The current in the circuit at \$t=0\$ equals \$\text{I}...
0
votes
3answers
97 views

Why parallel LC oscillator producing very high voltage?

I was trying to generate 1 MHZ frequency using LC parallel circuit using 2.53 mH inductor and 0.01 nF capacitor and I ...
0
votes
1answer
23 views

Why is there difference between the “ideal scenario” and the “ideal simulation” for this isolation transformer model?

The illustration below shows how an isolation transformer is protecting from electrocution by not letting the current to loop through the earth at the secondary side. Neglecting the parasitic ...
0
votes
0answers
39 views

RLC series circuit with initial current

I'm trying to solve, for the voltage across the capacitor in the following circuit: simulate this circuit – Schematic created using CircuitLab The initial current in this circuit is equal to \$...
0
votes
0answers
11 views

Differential Power Analysis - Sizing LC Filter for High Power (100W) Applications, Expected effect on Variance

Working on a project where I am defending against side channel attacks on consumer motherboards, specifically power analysis. By monitoring the power consumption of a motherboard in real-time, an ...
-9
votes
2answers
98 views

What is the value of R? [closed]

What is the value of R? I need the solution.
0
votes
2answers
79 views

How to design an impedance meter?

I am designing an impedance meter with NI devices. I am applying 0-20 uA current signal to an RC circuit and measuring the voltage. Impedance is calculated by dividing Vp-p by Ip-p. I am controlling ...
0
votes
1answer
97 views

How to find new ABCD parameters when reversing 2-port network

I have an ABCD matrix represenataion which is defined as: For such a problem, what approach should I follow in order to organize the new ( reversed) network ports voltages and currents properly. I ...
0
votes
1answer
97 views

Derivation of \$Z_{och}\$ & \$ Z_{sch} \$ for a symmetrical lattice two port network

I am trying to derive the open circuit impedance of half circuit [i.e \$Z_{och}\$ ] and short circuit impedance of half circuit [i.e \$Z_{sch}\$ ] of symmetric lattice two port network (which is shown ...
0
votes
2answers
63 views

Impedance in RLC circuit

Does the impedance of RLC circuit change with time ?I think that it changes because in the beginning ,the opposition of the inductor is maximum then it begins to decrease as di\dt decreases and vice ...
0
votes
1answer
34 views

In Parallel resonance circuit mentioned below, is current equal for Resistor and Inductor?

The parallel capacitor will have current leading voltage by 90°. In the case of Resistor and Inductor (which are in series with each other but they both are parallel to capacitor). Now, the upper half ...
0
votes
1answer
46 views

Is 'R' in impedance equation an AC or DC resistance?

I am using an impedance meter to measure impedance in complex form (R-jX) and an RLC meter to measure R & C values in an RC circuit. The value of DC resistance is equal to the R value in impedance ...
0
votes
1answer
49 views

Problem in LC series resonance

I'm trying to experimentally verify my calculations on resonance on a simple series LC circuit. To prove resonance, I'm measuring the amplitude on the series resistor. When the amplitude is the ...
0
votes
1answer
90 views

Is the author wrong about this RC low pass filter circuit? [closed]

When reducing an RC low pass filter, the author of a text book makes the following statement: “Let us assume the application is such that, so that the voltage across RL is negligible.” Is the book ...
0
votes
2answers
50 views

What are the initial conditions used to find the coefficients in the current equations?

Suppose a RLC series circuit. R, L and C are in series with a battery and a switch. The switch is open. L and C are discharged. At t=0, the switch is closed and the battery (V1) feeds the circuit. I ...
0
votes
1answer
64 views

How do I find the current equations for the RLC Series Circuit?

Let's talk about a RLC series circuit. R, L and C are in series with a battery and a switch. The switch is open. L and C are discharged. At t=0, the switch is closed and the battery (V1) feeds the ...
0
votes
1answer
74 views

How can I model and simulate a resonant inductive square spiral coil in MATLAB?

I was wondering if it was possible to model and simulate my WPT system in MATLAB to determine if my analytical calculations are correct. I want to model my system in MATLAB as I have seen on MathWorks ...
2
votes
2answers
59 views

Solving for initial current for an RLC circuit with step voltage source

I have a problem where I am asked to find \$i_L(t)\$ and \$v_c(t)\$ for a parallel RLC circuit, with a step voltage source. The circuit diagram is this below, where the voltage source is \$5 u(t)\$, ...
0
votes
1answer
48 views

LC circuit powered by MOSFET generates not stable

Sorry for poor English. I have a transformer from an old TV and try to generate HV discharge. I've added a capacitor (C1 on the scheme) to get resonant frequency around 17kHz. Used coil 5-6 for ...
0
votes
1answer
100 views

Matching impedance network for an LC ladder network

Let's say I have a 5 stage L-C ladder network with L= 4.7 micro Henry and C= 60 pF. The characteristic impedance of the network becomes 280 ohms (square root(L/C)). However, from circuit analysis, the ...
0
votes
2answers
69 views

Vo in an RLC circuit

So I have this RLC circuit: And its equations for voltage addition, current conservation, ohm's law and a solution of those equations (Vo). Then there's this RLC circuit: With another set of new ...
1
vote
1answer
57 views

Vpp of oscillation of LCR circuit

Edited: I'm having a trouble to estimate Vpp of a RCL oscillation circuit. I found a peak to peak inductor voltage (Vpp_L) varies with the different combination of LC, which makes sense because the ...
1
vote
2answers
76 views

Why does this resistor network simulate differently from the physical package?

I am trying to simulate a Bourns 4310R-R2R-104 dual terminator 104 circuit resistor network. According to the datasheet, the circuit looks like this: When I read the resistance between pin 1 and pin ...
0
votes
2answers
563 views

Cutoff frequency of a second order low pass RLC circuit

L = 25 mH, R =1 kOhm, C = 10nF and Vs(t)=sin(wt)V, freq = 500 Hz I am trying to calculate the cutoff frequency of a second order low pass RLC circuit I don't know if I can still apply the formula of ...
2
votes
2answers
107 views

RLC Impedance Calculation

Sorry, will provide more information now. I am working through this question from an all about circuits webpage (See attached webpage link) and have having trouble seeing how they calculate an ...
0
votes
1answer
35 views

How is the sweep type affecting the Bode plots for the same AC analysis in LTspice?

When I do an AC analysis for the following circuit between 0.1Hz upto 20MHz, and by selecting "decade" in sweep types I obtain the following plots: But if I do exactly the same thing only this time I ...