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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11 views

What does it mean, for poles and zeroes to alternate; Foster's Theorem

I'm currently learning Foster's reactance theorem; The most general driving-point impedance Z obtainable by means of a finite resistance-less network is a pure reactance which is odd rational ...
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70 views

Struggling to get an amplified sine wave over a small inductor at low frequencies

I am building a power amplifier circuit to amplify a sine wave over an inductor from a function generator. However because the inductor is small and i'm running at a low frequency I am getting ...
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1answer
61 views

Measuring the quality factor RLC circuit

I am trying to get the Q factor for this circuit but I don't know how to simulate it properly. I did a frequency sweep from 1 Hz - 30 MHz. The oscillating frequency is 16 MHz. I can't get the ...
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1answer
61 views

Help me see if I understand this RLC circuit

The switch closes at t=0 I need to determine the current and the voltage of Capacitor at t=0.25s at t<0 the switch is open there is no current and no voltage at t=0 the switch closes the current ...
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1answer
67 views

Capacitors capacity in an RLC circuit that is in resonance [on hold]

So if its in resonance that means XL=XC right? anyway thats how I started I∠=Irms∠=7.07/sqrt2 ∠30° A ω=10^3 Z1=R+jXL=1+1∠90°=sqrt2∠45° Z2=-jXC=1∠-90° Ztotal=(1/Z1+1/Z2)^-1=sqrt2∠-45° U∠=I∠*...
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1answer
101 views

How does the second order time constant affect circuit behavior?

I learned that the transfer function of a second order circuit can be expressed in the following standard way: $$ \frac{K}{\tau_s^2 s^2 + 2 \zeta \tau_s s + 1} $$ Where: \$K\$ is the gain \$\zeta\$ ...
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1answer
46 views

Are these valid transformations, Please guide

Please help check if the transformations in the pink are allowed, when solving a circuit. For the given circuit the goal is to find the current I1 which could be found using nodal without taking care ...
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1answer
178 views

Is my circuit solution correct?

simulate this circuit – Schematic created using CircuitLab I have to calculate the energy of the inductors magnetic field at t = 6 ms. I am given: E = 50 V, R1 = 10 Ω, R2 = 15 Ω, R3 = 20 Ω and ...
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2answers
55 views

I have to find all the voltages and current in the circuit

I am given Uab=100V XL=6Ω XC=3Ω R=4Ω This is how I started X=XL+XC=9Ω Ztotal=sqrt(R^2+X^2)=9.84Ω Zab=R+jXL=4+j6=7.21∠56.30 I=Uab/Zab=100/7.21=13.86A but obviously I made a mistake somewhere ...
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70 views

RLC circuit: how to find voltage/current derivatives and derive differential equation

Trying to resolve differential equations for RLC-networks, I'm always stumbling upon the voltage/current derivatives. Here I would like to give two examples from the same textbook and explain my ...
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36 views

Differential equation for a notch filter RLC circuit

I'm trying to write and solve a differential equation for this simple RLC notch filter and I'm not sure what I'm doing wrong. simulate this circuit – Schematic created using CircuitLab So ...
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1answer
69 views

Parallel RLC Circuit: how to write differential equation?

Please consider the following circuit: At t>0 this circuit will be transformed to source-free parallel RLC-circuit, where capacitor voltage is Vc(0+) = 0 V and inductor current is Il(0+) = 4. Now is ...
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4answers
100 views

What are AC and DC transients, rather do we even classify transients that way?

We are provided a syllabus in our university stating "Unit III - Transient responses of RL,RC,RLC circuits, DC and AC sinusoidal input". As far as I can see, "transients" are the response a circuit ...
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1answer
58 views

Find Io(t) of RLC circuit (from Electric Circuits, Nilsson )

My question is from the Electric Circuits, Nilsson 10th edition. My solution is For \$t < 0\$, we get \$i_o(0) = 2 \mathrm{A}\$ and \$v_o(0) = -400 \mathrm{V}\$. For \$t > 0\$, the circuit ...
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1answer
29 views

Should we include Source and Load Impedance while calculating two port parameters?

While calculating the \$Z\$, or \$Y\$ or \$h\$ parameters of a two port network, should we include the source impedance and load impedance or not? In other words, for finding \$Y_{11}\$, we short the ...
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74 views

Kirchoff's Law Problem

We were given a circuit with 7 resistors and 3 voltage sources For emf sources, \$E_1=120V\$, \$E_2=60V\$, and \$E_3=30V\$ while for resistors in ohms,\$R_1=10\$, \$R_2=5\$, \$R_3=20\$, \$R_4=8\$, \$...
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4answers
70 views

Quality factor in arbitrary RLC resonance circuits

I am looking for a way to calculate the quality factor in arbitrary RLC circuits not just standart series or parallel circuits. It would be great, if anybody could provide a formula and some further ...
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1answer
47 views

Calculating energy absorbed by an element

I need your help to understand the solution to the given question where energy absorbed needs to be calculated with the given graphs of the current and voltage through the element. Please help explain ...
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1answer
35 views

di/dt for R of general RLC, KCL dt algebra

Basic question. This is an exercise which requires all initial values for i and v0 (both 0), final values (yielding 2,4 A and 9,6 V) It also asks for di/dt and my question lies on the answer given (...
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3answers
89 views

Electrons inside an LC Circuit

I am having some trouble understanding the behaviour of electrons inside an RC circuit. Let me explain: One capacitor plate accumulates a lot of electrons, which pushes electrons away into the ...
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3answers
176 views

How do i remove this power supply noise?

Above is the circuit diagram of my power supply. it converts input 12V DC into 5V DC and then 3.3V DC with linear regulator. i have highlighted it in red color in the block diagram. So current ...
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55 views

How to find Rth for the Thevenin Equivalent Circuit?

So we were given this circuit to solve for I1, I2, I3, and lastly the Thevenin Equivalent Circuit. I was able to solve for I1, I2, I3. However I am having a hard time computing the RTH at ab. Here is ...
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49 views

How to do Transient analysis?

Consider the above example earlier I used to form a differential equation and then do its solution using Laplace,but for this example the differential equation comes out to be non-ordinary. Please ...
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1answer
26 views

Differential equation of a RRC circuit as Voltage output/voltage input?

So in this presentation i have got, there is a RRC circuit, and they get this differential equation, but there is no procedure explained how they have got it. This is basicially a series RRC circuit ...
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3answers
59 views

Difficulty in understanding the paragraph concerning h- parameters

This is a paragraph from "Engineering circuit analysis" by W H Hayt. I really don't understand the statement "it is difficult to open circuit the open terminals...." What does he mean in the paragraph?...
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3answers
119 views

Why can RLC resonance be dangerous for electronics

There is a lot of information about RLC circuits and resonance, and many times it is mentioned that when a series (parallel) circuit resonates, a really high voltage (current) can be found across the ...
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24 views

Phase margin Vs damping ratio: Intutive explanation

While designing the compensator for SMPS we always talk about the relation between phase margin and damping factor( or Quality factor). I don't completely understand how damping plays such a keyrole ...
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1answer
106 views

Toy “pull tab”-style feature on PCB

I have recently designed a passive-based modular PCB. When I click the secondary board into the base board, I would like it to break the current circuit at a fixed point, and insert itself in series ...
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21 views

T - matching network design

can you help me on understanding the procedure to design this T - matching network? My aim is that of transforming a resistive load R to a complex value R'', while R' indicates an intermediate value....
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1answer
42 views

Quartz Crystal and Resonance Frequencies

Let's consider this equivalent electrical model of a crystal: The evaluation of its series self resonance frequency is quite simple: it is sufficient to impose that the reactance of L1 is equal and ...
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2answers
47 views

Getting negative energy in a coil (RLC-circuit) after opening the switch

I've the following circuit: simulate this circuit – Schematic created using CircuitLab The switch was 'forever'closed and a certain time \$t=0\$ I open the switch. I tried to find the energy ...
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50 views

Always starting LC colpitts oscillator

Is there a way to make an LC oscillator that works in most circumstances? Which is able to start up an keeps oscillating for a wide range of inductors? I'm asking this because I made a LC oscillator ...
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3answers
82 views

Quartz Crystal Electrical Model

I need some explanations about the electrical model of a Quartz. Everywhere I search the definition of quartz I find that it is a crystal that starts oscillating mechanically if it receives a ...
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1answer
72 views

Second order RLC circuit problem about signs

Consider this circuit. Which is a second order RLC circuit. The problem asks for value of \$\phi\$ from the initial conditions. I took the first derivative of the equation by hand but as you'd see ...
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1answer
25 views

ILC circuit second order equation

Consider this circuit. The question asks for write an algebraic expression for the second derivative of the inductor current in terms of the source current \$I\$, the inductor current \$iL\$, the ...
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1answer
68 views

Identify the element among RLC

question : A two terminal network consists of one of the RLC elements . The element is connected to an a.c. supply .The current through the element is I A. When inductor is inserted in series between ...
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4answers
130 views

Is it possible to use a DPDT switch to swap 2 inputs and 2 outputs?

I want to create a passive device with two MIDI inputs and two MIDI outputs, with a switch that has two states. In the first state, input 1 is connected to output 1, and input 2 is connected to output ...
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2answers
64 views

Identifying a LC oscillator circuit and solving resonance frequency

Could someone please identify what type of oscillator this is in the first stage. I'm not quite sure if it is a Colpitts or not and also could someone specify the resonance frequency calculation if it ...
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1answer
101 views

RL circuit unit impulse response

Consider this circuit. We apply a unit impulse \$\delta(t)\$ that is \$v_{IN}(t) = 1 \delta(t)\$ volt-seconds. That is, \$v_{IN}\$ is a unit impulse at time t = 0. Since this circuit is driven by an ...
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2answers
51 views

Finding the settling time of an oscillatory response

I was reading my book on circuit analysis on chapter about RLC response and became curious about how to get an approximate value for the settling time of the response. Particularly this response ...
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1answer
75 views

What will be Resistance for maximum Power transfer from network A to network B?

simulate this circuit – Schematic created using CircuitLab Can we apply Maximum Power transfer theorem if we are given two networks both with voltage sources. In solution it was said that for ...
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2answers
65 views

Voltage spike at the coil when opening the switch [duplicate]

I've the following circuit: simulate this circuit – Schematic created using CircuitLab In my book they stated the following sentence: After that the switch is closed for a long time, I let ...
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1answer
46 views

Voltage exceed source voltage over a coil when opening a switch

Well, I have the following circuit: simulate this circuit – Schematic created using CircuitLab When the switch is closed for a long time, the current that is flowing trough the resistor \$R_1\$...
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35 views

How to solve a RLC circuit with a dependent current source

I am working on the following RLC circuit in the drawing. I am stuck at the part where the switch goes to 'b'. That's where the dependent source comes to play. Should I use nodal analysis or find the ...
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77 views

Finding the voltage across an inductor in a RLC circuit

Well, we have the following circuit: And I need to find the voltage at the node \$\text{Y}_1\$. My Work: The input voltage and current relation is given by: $$\frac{10}{s}=i_{in}(s)\cdot\frac{1}{\...
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1answer
40 views

AC signal analysis: Voltage dip (amplitude dip) at time = 0

I'm working on a series RLC problem where the input voltage is a sinusoidal function for all time. The catch is, for t < 0, the sinusoidal function is of greater magnitude than t >= 0. There is no ...
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1answer
94 views

How to solve infinite grid with the observing terminals at diagonal of infinite square matrix?

The answer given is 2/3ohm solution is not given but I can expect how they got that answer but can't justify the way.
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2answers
87 views

Butterworth passive filters normalized values equation

Recently I'm reading in-depth about butterworth filters, more specifically about the normalized values the tables give. Most of the tables give you the normalized values for the case of RL/RS=1 or RL/...
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1answer
58 views

What is difference between natural response and zero-input response of a system and how to find natural response?

In most books it is said that natural response is another name to zero-input response while in some resources is is mentioned that the classification is based on poles of transfer function and input....
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3answers
475 views

Inductor and capacitor for energy storage instead of battery

I am trying to see if it would make sense to use a LC network to store small amount of electrical energy (500 mWHr or less) as an alternate of a 3.3 V battery. What I understand is that L and C are ...