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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.

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Find v(s) in the circuit below(voltage through the capacitor)

Capacitor initial conditions = 10v, inductor = 2A. Input is the current font.Find voltage through the capacitor I think i got it but i have no clue whether its right or not, would like to know what i ...
Romulo Mendes de Souza's user avatar
3 votes
2 answers
498 views

How can these passive RLC circuits change a sinusoid's frequency?

Given a sinusoid input of frequency f, an RLC network, no matter how complex, should produce a sinusoidal output of frequency f, with possible attenuation and phase shift. At least that's my ...
SRobertJames's user avatar
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1 vote
3 answers
132 views

Does this op amp connected to an LC tank amplify its resonant frequency?

The circuit below has a resonant frequency at 159.155 kHz and should amplify it: That's exactly what this sweep predicts: But,even when setting V1 to 159.155 kHz the transient analysis shows no ...
SRobertJames's user avatar
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0 votes
4 answers
139 views

How to analyze a current sink for an ideal power amplifier

In preparing a design for a MOSFET RF Power Amplifier, I analyzed this idealized circuit: My analysis is in some ways consistent with simulation but in some ways gets very different results. Is my ...
SRobertJames's user avatar
  • 1,175
4 votes
2 answers
291 views

Order of an RC circuit and independent initial conditions

I am trying to determine the order of the transfer function of the RC circuit shown below. I learned that the order of the transfer function is equal to the number of independent initial conditions ...
Curiousone's user avatar
0 votes
3 answers
179 views

How to find a characteristic equation for the current response for this circuit?

Source: Linear Circuits Time Domains, Phasor, and Laplace Transform Approaches Third Edition. author: Raymond A. DeCarlo, Pen Min Lin Publisher: Kendall Hunt Publishing Company I suspect this solution ...
TSLee's user avatar
  • 157
0 votes
1 answer
71 views

Different frequency responses for series RLC series circuit using Multisim vs. MATLAB

I have been trying to simulate the following RLC circuit: When I simulated in Multisim Live I obtained the following frequency response, which I expected based on the values I used to calculate ...
Parker's user avatar
  • 27
0 votes
1 answer
152 views

LC filter - single-phase inverter

There are LC filters put at the output of the inverters to filter and produce a pure sine wave. There is no clearly calculated and well explained document about this topic. The first picture shows a ...
Mhan's user avatar
  • 405
0 votes
2 answers
68 views

How to calculate this two port network impedance of this circuit?

This is the schematic from youtube link. Here is how I analyse this circuit. $$I_1 + 6 (I_1 - I_x) = V_1 \tag{1}$$ $$2 (I_2 + I_x) = V_2 \tag{2}$$ And to calculate \$I_x\$, we have $$6 (I_1 - I_x) = ...
kile's user avatar
  • 907
0 votes
1 answer
72 views

LC lowpass π-type filter design

I am trying to design a LC lowpass π-type filter for power filtering. The power being filtered in question is from a SMPS(LRS-75-24), which has large amounts of HF noise which cannot be filtered out ...
lemon's user avatar
  • 614
-3 votes
1 answer
112 views

Consider the following circuit system (RLC Circuit, R and L parallel then series with C), please determine the transfer function

i'm trying to figure this out, but i'm still confused. Can anyone help me? Thank you This is what i've done. Am i in the correct path?
SKevinAR18's user avatar
0 votes
1 answer
82 views

Signal gets amplified in oscilloscope

I am fresher and doing a semi-conductor experiment at my university. I have some problems with my oscilloscope. Signal from my university's oscilloscope: My input signal is 2V peak to peak, with the ...
CÔNG NGUYỄN DUY's user avatar
0 votes
2 answers
147 views

How to calculate the transfer function of an RLC circuit?

I'm starting to study control systems, but I'm still having difficulty with the modeling issue to obtain the transfer function. The input voltage is on the signal generator (VE) and the output voltage ...
Renan Saraiva dos Santos's user avatar
0 votes
2 answers
90 views

Parallel RL-C circuit simulation to calculation issue

I have been trying to make some sense of a parallel AC RL-C circuit for over a week now. The question asks "Measure the current and active power absorbed by a lamp (simulation circuit below and ...
RobotDog's user avatar
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0 answers
91 views

need help with inductor RLC circuit

I found a mediocre source that kind of helps me. I want to find the magnetic permeability of an inductor core based on changes to the rlc circuit. The source I found is here: https://old.joam.inoe.ro/...
Eric Huang's user avatar
2 votes
2 answers
108 views

Transient analysis in presence of faults

While reading Shenkman's Transient Analysis of Electric Power Circuits I came across the following problem: ... This circuit represents the equivalent of a d.c. supply network. At the instant of time ...
Awe Kumar Jha's user avatar
1 vote
1 answer
144 views

Find R, L and C in RLC series circuit given voltage over capacitor and current through inductor

I have a couple of exercises in my textbook (Fundamentals of Electric Circuits 6th edition) that look like the following: To solve this problem, my first idea was to transform it into the laplace ...
Tom Cajot's user avatar
3 votes
2 answers
216 views

How to convert the equation to its complex form?

I'm currently trying to calculate the answer for Io. However, I don't understand how the equation is converted from the highlighted value labelled (1) to the one labelled (2), as shown in the picture ...
miu.spiro's user avatar
0 votes
2 answers
217 views

Exponential stability of a general \$RLC\$ circuit with sinusoidal input

I conjecture that any \$RLC\$ circuit with \$n \ge 0\$ independent sinusoidal voltage sources of the same frequency is exponentially stable. How to prove this or if this is not true, how to modify the ...
Sgg8's user avatar
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1 vote
2 answers
139 views

How does this metal detector circuit work with an AM receiver?

I do not understand how this circuit works. From Fun Electronics Projects for the Experimenter by Newton C. Braga. It is described as using the beat-frequency method to detect an object. The ...
Maro2058's user avatar
1 vote
0 answers
120 views

How to derive an ODE for a general n-th order LTI circuit?

I have seen in multiple books the following fact: Suppose we have an n-th order \$RLC\$ LTI circuit with and independent volatage source \$x(t)\$. Then a voltage \$y(t)\$ of some node in the circuit ...
Sgg8's user avatar
  • 163
1 vote
3 answers
146 views

Initial conditions in a circuit with two ideal transformers [closed]

I don't know how to determine initial conditions in Laplace transform for a circuit or a system of circuits with ideal transformers with neither mutual inductance nor coupling coefficient is given. I ...
Mertlious1's user avatar
0 votes
0 answers
47 views

Differentialy Fed Antenna Feeding Network

I need help with the feeding line for the following scenario. I have a dipole-like antenna for which I need balancing the input, see picture (dipole antenna used just for illustration; it does not ...
Humphrey Appleby's user avatar
4 votes
2 answers
523 views

Impulse response of an RL circuit

I've got homework in the Signals & Systems class I'm taking, and I'm trying to find the impulse response to this circuit whose transfer function I've found. In the class we've done practice ...
m3ll0w's user avatar
  • 41
0 votes
1 answer
112 views

impulse response for a series RLC circuit

How I can solve this? The impulse response of Vc is wanted. I have problem with current in right mesh and I can't write it by Vc or ... . Here is my attempt:
ASAN's user avatar
  • 1
0 votes
2 answers
136 views

Is an ideal transformer a reciprocal two-port, and if so, how would you define reciprocity?

Reciprocity is commonly defined, (https://en.wikipedia.org/wiki/Reciprocity_(electrical_networks)), such that for Z-parameters, ...
Andy Ackland's user avatar
1 vote
3 answers
429 views

What is the difference between natural frequencies and resonance frequency in second order circuits?

The following circuit: can be described by: $$\frac{d^2v_c}{dt^2} + \frac{R}{L}\frac{dv_c}{dt} + \frac{1}{LC}v_c = \frac{R}{LC}i_S$$ From there, it's clear that the undamped natural frequency, or ...
Dan's user avatar
  • 145
1 vote
2 answers
211 views

Oscillator's frequency way off LC prediction

I tried to make the simple Robinson oscillator given in the pictures below using cross-coupled NPN transitors attached to an LC tank circuit. The part that I have used is M2N4401. The issues I find ...
luiz_iniciante's user avatar
0 votes
1 answer
46 views

Delta to Y with sources?

I'm wondering if this transform is possible: I tried doing a source transformation to change this to a regular delta network with two current sources going to nodes a and b, but wasn't sure how to ...
KKZiomek's user avatar
  • 141
0 votes
2 answers
112 views

Determining poles and zeros from those of interconnected two-port networks

My goal is to find the poles and zeros of a large network. Specifically a cascade connection of series C's and shunt L's. One could also consider this a CL Ladder circuit. I am interested in ...
asgarth's user avatar
0 votes
0 answers
76 views

Complex equations in AC RLC circuits spiralling out of control

I'm trying to solve the following circuit. I tried using superposition to find Thevenin at V_o. First I solved for V_o with the current source and dependant source, then I solved for V_o with the ...
Tom Cajot's user avatar
0 votes
1 answer
44 views

Adding inductance in order to make AC offset

everybody The task was to introduce a 10 MHz AC signal to the output along with the 24 DC voltage. If I directly connect DC to the circuit, at the output (75 Ohm resistor) I get the straight line =>...
Bushpulbek's user avatar
2 votes
1 answer
269 views

What kind of resistive network are these?

Some years ago I purchased three big resistor bags at an Electronic Fair: since then I've been organizing their values in my drawers. I found also the something that seems a couple of resistive ...
Daniele Tampieri's user avatar
1 vote
1 answer
501 views

How can I find the Q factor an LC circuit using LTspice?

I've built a very simple LC circuit which models a air core copper wire loop antenna. I got the circuit resonate at around my desired frequency i.e., 13.56 Mhz. Now I want to calculate the Q factor ...
Hako's user avatar
  • 11
1 vote
1 answer
251 views

How to choose power rating of a damping resistor for an LC filter? [closed]

I am trying to put power filter for an SMD oscillator (https://www.renesas.com/us/en/document/apn/863-power-filter-recommendations-smd-oscillators). One concern is the LC resonance. There are ...
jsmith's user avatar
  • 679
0 votes
1 answer
64 views

KVL/KCL and Thevenin Concept [closed]

I have solved the following question but little bit confused that this solution is correct or not as attached in figure. How can I solve this question by KCL/KVL also if by using Thevinin theorem its ...
Zerox's user avatar
  • 33
0 votes
1 answer
125 views

First order RC highpass filter input capacitance

I'm trying to find the capacitive load repreented by an RC first order highpass filter. Intuitively, I tend to believe the load will not be the C series capacitance, since the capacitor is not being ...
MPA95's user avatar
  • 577
0 votes
4 answers
448 views

Power Dissipation in an AC Circuit

I'm seeking clarification on power dissipation in an AC circuit with a specific scenario in mind. I was able to calculate the RMS current through the AC Mains = √10 A Considering that the upper ...
QuantumQuipster's user avatar
0 votes
0 answers
99 views

Calculating inductance of solenoid using a resonant RLC circuit

I tried to perform an experiment in my school physics lab with an RLC circuit. I plotted the variation of the voltage across the resistor against the frequency of the source. From the figure below, it ...
Shreya Anish's user avatar
1 vote
1 answer
83 views

An active inductor connected to an inactive inductor in series

I am a grade 12th student studying about inductors and RLC circuits for the first time. While studying I got stuck with the idea of an active inductor being connected to an inactive inductor. ...
Anirudh Panguluri's user avatar
5 votes
2 answers
1k views

Input filter LC for switching power supplies

I have the following LC low-pass filter for a power supply. I want the filter to cut-off unwanted noise caused by a DC motor. simulate this circuit – Schematic created using CircuitLab How can ...
MrBit's user avatar
  • 2,053
2 votes
1 answer
329 views

System of First Order ODEs for a Parallel RLC Circuit

I understand the behaviour of an RLC Circuit in Series can be modelled by the equation: $$ L \frac{d^2Q}{dt^2}+R\frac{dQ}{dt}+\frac{Q}{C}=0 $$ Which can be represented by the system of First Order ...
Sterling Saini's user avatar
0 votes
2 answers
311 views

Understanding my basic parallel LC circuit, theory vs results

I made a basic LC parallel circuit. 2.9 µH inductance (measured with a cheap meter) 560 nF capacitor in parallel following f = 1/((2pi)sqrt(LC)) it should resonate at 124.89 kHz, but was manually ...
cj91's user avatar
  • 155
2 votes
1 answer
82 views

Efficiency formula for passive complex circuit

I want to find a formula for the efficiency of this circuit, so \$\eta=P_{out}/P_{in}\$. simulate this circuit – Schematic created using CircuitLab I know that the real power is given by \$P=VI\...
Trypol's user avatar
  • 23
0 votes
1 answer
48 views

Calculations differ slightly from LTSpice

Can someone please help me find the step in my solution to this problem where I went wrong my answer differs from my ltspice simulation. Source frequency is 100Hz. Thanks.
Swiss Gnome's user avatar
0 votes
4 answers
154 views

Analysis of an RCL Filter Utilizing a Potentiometer as R

I am trying to calculate the parameters ζ, Q, Fo, Gain (dB), and BW of this circuit. I am confident in the following equations: Fo = 1 / (2 * π * √(L2 * C1)) ; Q = 1 / (2 * ζ) ; BW = Fo / Q R2 = R5; ...
flower.fish's user avatar
0 votes
1 answer
61 views

Parallel RLC Simulation: 0° Phase and Maximum Amplitude Don't Occur at the Same Frequency in LTspice

Context According to LAB 3L.1.1 -- Response to a Sinusoid in Learning the Art of Electronics - a Hands-On Lab Guide (by Hayes, Thomas C. and Horowitz, Paul, Cambridge University Press, 2016) 3L.1 RC ...
pfabri's user avatar
  • 904
0 votes
0 answers
131 views

Elmore delay resistances

I know this question has already been asked enter link description here, but honestly I did not find the answer exhaustive, so I am going to ask it again, in a more specific way. WHY in the Elmore ...
Urza_tron's user avatar
  • 101
2 votes
1 answer
137 views

Inductor and Capacitor Timer - Strange behaviour: Need help understanding

I am learning about coils for a boost converter project I’m working on. In my experiments I came across this strange phenomenon. We have an ideal capacitor being charged by an ideal coil with a diode ...
Kuba0040's user avatar
0 votes
1 answer
323 views

State space representation of RLC circuit [closed]

Express the circuit in state space equations, the output is V2. I have tried defining the state variables but got stuck with the differential equations.
Menzi Ntshangase's user avatar

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