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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208 views

Home made passive tablet pen

I have an old wacom tablet at home, its really big and I'd like to use it but I've lost the pen for it. It uses pens with passive LC circuitry. The board creats an EM-field (I can see it on my ...
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168 views

Appoximation of a transient response of a more complex circuit

I have a "complicated" circuit that I want to approximate as a simple harmonic oscillator. More info below. I have a parallel LRC circuit, with some extra input and output load resistors and coupling ...
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542 views

Differential Equation of a LC Low Pass Filter

I'm trying to learn about different applications of RLC circuits and have been presented with a weird looking circuit... I've only ever dealt with circuits that can be modeled with a 2nd-order ...
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1answer
285 views

LC circuit with series diode (finding the linear average)

I've the following series LC circuit: Find the (linear) average of the current trough the diode. The ideal is a ideal component. The initial conditions in the circuit are equal to zero. MY ...
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24 views

Finding the impedance of a distribution line from R,X,C values

I have real industry data of distribution feeder with line data consisting of r ,x and c values as shown in the attached figure. ...
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1answer
82 views

Substitution + Superposition with RLC circuits

Consider the following circuit: simulate this circuit – Schematic created using CircuitLab \$E\$ is a constant voltage source. The switch is closed at time \$t = 0\$. The request is to ...
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56 views

RLC Circuit with Dependent Source

I am trying to solve the attached practice problem from Hayt's 8e of Engineering Circuit Analysis but I am struggling to find a solvable differential equation for the circuit. I am trying to use KVL ...
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83 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
81 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
177 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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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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85 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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42 views

Passivity of impedance matrix on the imarinary axis

According to this paper, Section V-C, a rational impedance matrix Z(s) is the impedance of a passive lumped system if and only if the following four conditions are satisfied: 1) each element of Z(s) ...
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1answer
51 views

enveloping curve - LTPSICE

I have built a simple rlc circuit with a pulse input and performing transient analysis on it. I am interested in the voltage of the behavioral voltage source as shown in circuit. The system is an ...
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1answer
136 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 ...
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1answer
158 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 ...
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1answer
242 views

RC-LC network equals lowpass filter of third order?

As far as I know only this are two lowpass filters (R-C1, L-C2) of order 1 and 2 respectively. Is it possible to denote this circuit as Low-pass filter of third order? Or is it possible to transform ...
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2answers
162 views

Eliminating the resistance variable in the total resistance/reactance equation of a series RLC circuit

Assuming that we have a simplified equation from a simple series RLC circuit where the total resistance/reactance in the series RLC circuit is equal to 100 times the resistance R: How do we modify ...
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1answer
72 views

How do I determine the unknowns for this equation?

Suppose a series RLC circuit in series with a 12 V battery and a switch initially opened. R = 100 Ω, L = 100mH and C = 10uF. L and C are initially discharged. A t=0 the switch is closed. I want to ...
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442 views

State Space model for three-loop circuit

How do I choose the least number of state variables for the following circuit? I started out by assuming currents $$i_{1}, i_{2}, i_{3}$$ in each of the loops and applied KVL, which fetched me three ...
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1answer
69 views

Bounds of impedance matrix of a passive two port network

If we consider the impedance matrix of a linear, reciprocal passive network (Z12 =Z21 because of the reciprocity), $$ \begin{bmatrix} Z_{11} & Z_{12} \\ Z_{12} & Z_{22} \...
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169 views

Question on inductors with initial current

Question: Initially the switch position is aa', 3 H is connected across a 3 A supply and 6 H is connected across 6 A supply. After some time the make before break switch is actuated to the new ...
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2answers
562 views

Transfer function of phase change controlled with capacitance

We have an RLC series circuit with sinusoidal voltage source of frequency \$\omega\$. The normal transfer function of current to voltage is: $$ G(s) = \frac{I(s)}{V(s)} = \frac{1}{R+s L+ \frac{1}{s C}}...
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191 views

Problem calculating resonant frequency [series RLC]

I try to link/prove the theory of resonance in practice. So for test I connected in series 1mH inductor, 1k Ohm resistor and 2.1 uF ceramic capacitor. Calculated resonant frequency -> \$ f_{r} = \...
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1answer
361 views

Some questions about a magnetically coupled circuit

Below the RLC circuit on the left side by the help of a periodic impulse generator V1 generates periodic damped oscillations with a certain frequency, and the resulting oscillating current couples to ...
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275 views

LC matching or pi filter used in rf

I am working in RF and if i go through articles it is seen that in every point where the RF signal flows it is said we need LC matching networks or Pi filters, but i cant get the sole reason why they ...
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19 views

Impedance matching for inductively powering / rectifier

I have two questions. If the receiver is inductively powered (by LC resonator) and needs a matching network in front of the RF-to-DC rectifier, what kind of quality factor of matching network (or Qs ...
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354 views

Transfer function of EMI filter

In order to define the transfer function of an EMI filter, I want to know if I need to define the equivalent circuit in CM and in DM to calculate the total transfer function of the filter below:
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97 views

i want to operate a normal 220V/50hz Air conditioner at 115V/400HZ system

I have a AC inverter board . in the start ( imean before converting AC 220v to DC 310v ) a filter LC pie filter is used . as we know the operating voltages of AC is 220V/50Hz for normal air ...
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277 views

Voltage across capacitor in a electrical circuit (LCC circuit)

My networkanalyses book told me that the voltage across the capacitor C2 is given by: $$\text{U}_{\text{C}_2}\left(t\right)=\text{U}_{\text{in}}\left(t\right)+\text{C}_1\cdot\text{L}\cdot\text{U}_{\...
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139 views

What is the official name of this item?

I have purchased this item locally in the past and basically its 5 wires aligned in parallel, and makes my circuitry much easier (eliminates the needs to manually connect 5 individual wires side-by-...
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123 views

Preferable mixed mode (SMPS + Linear) PSU topology

I'm designing power supply for my hybrid headphone amplifier. It will be powered from external SMPS of unknown quality. Amp's power supply contains linear part (linear regulator + rail splitter) and ...
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1answer
30 views

Converting a Lithium Ion Model from a Foster Network to a Cauer Network

It is possible to convert common thermal RC-models between the Foster form and the Cauer form, as seen here: I was wondering if and how this is possible with lithium-ion cell models, which commonly ...
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29 views

LC filter, frequency limit?

Do practical implementations of LC filters have a limited bandwidth over which they operate? ie. Would they start to attenuate less as the frequency of the input signal get very high (MHz->GHz)?
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1answer
42 views

High Voltage LC Oscillator Circuit

I am interested in creating an LC oscillator circuit that uses a high voltage DC source. The DC supply is variable from 5-35kv. I have seen numerous posts about creating these circuits at low voltages,...
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39 views

How can I build proper laplace RLC circuit

I think there are two different circuits over the picture. But for equations they are acting same to me. I mean DC source of left circuit look like an initial voltage for C. After inver Laplace I have ...
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25 views

Simple Filter and RLC Circuit Pointer

If someone could push me in a decent / reasonable direction it would be much appreciated! I do a HNC part time on electrical / electronic engineering and with how busy I have been at work I feel I ...
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1answer
66 views

Synthesising a circuit when \$Z_{21}\$ is known

I have a \$Z_{21}\$ parameter of a circuit which is given by $$ Z_{21}(s) = \dfrac{s}{s^3 + 2s^2 + 2s + 1}$$ I would like to synthesize as an L-C ladder network with \$ 1 \Omega\$ resistive ...
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1answer
96 views

Initial Condition in Series RLC Circuit

I have the following RCL circuit simulate this circuit – Schematic created using CircuitLab After using the Laplace transform my lecture notes mention that we get the following circuit ...
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56 views

Generate identical positve going and negative going pulses/spikes at the same time

I am interested in building a circuit to generate a sharp positive pulse and an identical negative pulse at the same time with a peak of about 10 to 200 V. So when I say sharp I would like a rise time ...
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2answers
52 views

What does a simple passive circuit to simulate an impedance mismatch look like?

I am trying to learn some of the basics of circuit design. One thing I am curious to make a filter/schematic of is what happens when a voltage source hits an impedance mismatch. eg. A high impedance ...
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27 views

Initial conditions in multi-state Tesla Coil circuit

Half a year ago I posted this quesion about a Tesla Coil resonant circuit which got an amazing answer that helped me understand the resonant frenquency of such circuit. Now I've returned to that ...
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31 views

Infinite hexagonal impedance network with loads at specific nodes

It's been a couple weeks already that I am trying to solve this network on the paper. It consists on a infinite/periodical hexagonal lattice but with some peculiarities. First of all, this is not the ...
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2answers
74 views

2nd order Low-Pass Output Impedance and Phase difference

I am trying to calculate the output filter impedance and the phase difference of the inverter that I am designing. However not sure how to construct a formula for both the output impedance and phase ...
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1answer
26 views

Solving a series RLC DC step response circuit

I got two different answers to this RLC problem when using a method shown in class. What am I doing wrong? Edit: I graphed each answer. I'm assuming the answer for Vc on the right is correct, as the ...
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37 views

Using Thévenin to find I3 current

i'm an engineering student and i've come across this problem i have to use Thévenin method, even though i could find Zth by "short circuiting" the power sources and opening the circuit at I3, i'm ...
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40 views

RFI filter modeling in LTspice w/ triac

I have a few questions about modeling an RFI filter in LTspice with a triac-based dimmer circuit. I'm referencing the circuit described in Figure 11 in Triac Principles and Circuits -- Part 2 (Nuts &...
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29 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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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
36 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 ...