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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1answer
41 views

Emulate impedance response using RLC components

I need to emulate measured impedance response of some blackbox using only RLC components. Measurements: ...
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3answers
51 views

Question about RLC circuit and struck in a problem, in the calculation getting current as infinity for the given values

Question about RLC circuit and struck in a problem, attached the photo related in the calculation getting current as infinity for the given values.any idea how to move forward
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2answers
51 views

Why is the Hybrid-PI model like that?

The BJT and MOSFET can be modeled using the Hybrid-pi model. I only know that the transistor can be modeled with linear elements like that, but I don't know why. There are a lot of things that confuse ...
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1answer
38 views

Negative Freqs from FFT in Laplace Circuit Analysis

Do I use the absolute-value of the FFT frequencies when using the Laplace equations for calculating the impedance of an RLC circuit? I'm currently working on something where I need to numerically ...
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38 views

Underdamped RLC with CCCS, calculating capacitor voltage

Referring to "Electrical Circuits" Nilsson/Riedel 10th Edition. I have a classic underdamped RLC circuit with a CCCS (Current Controlled Current Source) with a current multiplication factor ...
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2answers
52 views

Colpitts Oscillator Issue

how are you all doing? I have been experimenting with the Colpitts Oscillator and encountered a minor issue that I would like to resolve. Here are the two circuits - the first one is working ...
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0answers
42 views

How can you calculate the transfer function of any parallel circuits?

I have now seen a few cases where RC in parallel are used as a Filter or just the famous LC filter. But I am asking my self. How do you calculate the transfer function? Now Kirchhoffs voltage law ...
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1answer
71 views

Simple LC circuit implementation

I'm implementing a very simple LC circuit where the power supply is connected to an inductor (of 4 micro Henry specifically), and the inductor is connected through a diode to a capacitor going to ...
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28 views

Initial conditions for this LC-Circuit

I have an upcoming exam in a few days so I'm going trough some problems I found online or in textbooks and just try to solve them. I have one here where I'm not entirely sure about the initial ...
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27 views

Second Order Circuit \$\omega_0\$, \$\omega_d\$ and \$\alpha\$ naming

In 2nd Order Circuits I usually solve them with solving differential equtaions by checking jumps. But today my teacher solved a question by using \$\omega_0\$, \$\omega_d\$ and \$\alpha\$. I think ...
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36 views

Second Order Op Amp RLC Circuit

Is there a way to make an op amp circuit using only RLC and op amps that would make V0 = V1-4V'1 -3V''1 -5V2 possible? Assuming that V1 and V2 are independent sources and considering that the prime ...
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2answers
26 views

Phase relationships in AC circuits

Is it wrong to use the mnemonics "ELI the ICE" [ From my understand means if its inductive current LAGS voltage and if its capacitive current LEADS] in understanding the phase relationship of a ...
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High-Pass Filter Setup

In several designs I've come across the following setup. Design -> RC Network (High Pass) -> Oscilloscope Input: Where SK2 is the SMA connector from the PCB that goes into an oscilloscope. Some ...
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1answer
52 views

Is this parallel resonant circuit problem fully constrained?

Is there a single answer to the following question? Design a band-pass filter using a parallel resonant circuit to meet the following specifications: \$BW=500Hz, Q=40, I_{C_{max}}=20mA, V_{C_{max}}=2....
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4answers
2k views

What are the resonant frequencies for this RLC circuit?

What are the resonant frequencies in the following circuit? Full disclosure: this is question 34 on page 655 of Pearson's Electronics Fundamentals 8th Ed. I recognise the parallel section comprising ...
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0answers
25 views

Two port networks - Why are shared Z-parameters not negative?

In basic electronics we learned that to solve a circuit using mesh analysis, the shared impedances had to be negative. For example in the circuit bellow, the system of equations would be: $$\begin{...
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LC filter design

I want to ask you about the following graph, how can I design the values of the L and C of the LC filter? I mean is there any equations I can use for this design? NOTES: 1.This is a low pass filter ...
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1answer
159 views

How do I calculate the equivalent RLC circuit values for a non-ideal capacitor?

The circuit below was constructed and the voltage across Cx measured with an oscilloscope. The measurement is shown below the circuit. The capacitor has a nominal capacitance of 22uF. The square wave ...
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1answer
71 views

LC Oscillator using LM311

I am trying to build an LC meter for measuring capacitance variations based on an LC tank Oscillator and an LM311 comparator. I took the circuit from this source (https://www.schiessle.de/emt1/...
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1answer
173 views

Is my answer correct to this non-ideal capacitor question?

In the picture there are two measurements. The one is of a single 10uF capacitor as shown in the picture. The other measurement is of the 3x 3.3uF capacitors in parallel as shown in the picture below ...
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4answers
80 views

How is the second capacitor charged in a Colpitts oscillator?

C1 is connected to ground, so there should be no current from C1 to C2. C2 will get charged by L1, but then in that case those two capacitors were not connected in series, they can't divide voltage, ...
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2answers
38 views

What is the theory behind these current equations? (for Z paramaters)

In the photo below is shown the method for deriving z-parameters of the circuit. Apologies for my badly drawn values for resistors as they weren't shown in the original image. Basically I'm struggling ...
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1answer
51 views

Deriving the Impedance equation of a RLC circuit (with 2 Inductor)

simulate this circuit – Schematic created using CircuitLab During this lockdown I had some time in hand and decided to learn more about impedance. So I gave myself a project, trying to create a ...
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3answers
382 views

Am I on the right path to solve this RLC-Circuit? (Need to find the voltage at the resistor)

I'm currently taking Physics II and I'm tasked to solve for the voltage $$U_R(t)$$ in this circuit. It's driven by a current source $$I(t) = I_0*e^{i*\omega*t}$$ and I can neglect the switch on ...
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0answers
220 views

How do you verify lower cutoff frequency from a voltage vs. time graph?

I am working on a laboratory assignment. I am asked to verify the lower cutoff frequency (F1) value that I calculated (~4950 HZ) using a graph. The lab specifically asks: "Reduce the input frequency ...
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1answer
57 views

State-Space Equation

Hi everyone. Please i am trying to derive the state space representation of the circuit above. Please i need some help or a textbook for better understanding of this.
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Wire model RC vs LC/RLGC

The condition for using an LC/RLGC model over an RC model is when: f > R/(2*pi*L) (see for example http://www.ece.tamu.edu/~spalermo/ecen689/lecture2_ee720_channels.pdf slide 19). This explains why ...
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3answers
60 views

How can you find Quality Factor of an arbitrary RLC Circuit?

I'm having a trouble with this circuit. Apparently I know how to deal with a simple RLC circuit but this one is tricky
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4answers
127 views

Equicalent circuit - RC // RC

I am doing a filter analysis of a simple network filter, requiring drawing some equivalent circuit to simplify the expression and analysis of the transfer function. The issue I've got is regarding a ...
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1answer
37 views

Is it possible to combine two CFU455IT +/-2kHz (4kHz) ceramic filters to get a +/-1.25kHz bandwith (2.5kHz) filter?

Can I put two of these cheap (less than 3USD) and common CFU455IT +/-2kHz (4kHz bandwith -6dB ) ceramic filters in series to get a lower bandwidth good for SSB TX? If I'm correct I will get -12dB at +/...
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1answer
39 views

Matlab RLC simulink and code help

In the circuit in the figure, the switch closes at time t = 0. What is the change of capacitor voltage and coil current in the range of 0-15 seconds? Show the solution in M. file and Simulink. Can ...
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1answer
62 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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32 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
47 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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1answer
54 views

Choosing inductor package for LC filter

I understand that one needs to consider inductance, current rating and self resonant frequency when selecting an inductor for an LC filter. But it seems like there are so many different inductor ...
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0answers
41 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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2answers
63 views

LC Filter / Matching - Why does this cap help?

this is my first question on the site, so please let me know if there's something I can do to write it more helpfully. The Problem: I'm building a small radio. At the output of my mixer, I need to ...
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3answers
112 views

Solving an RL Circuit with an Inductor in Parallel to Resistor-Inductor in Series

I tried to look through my textbook to find anything similar to this one and have tried every solution I can think of to no avail. For now, I settled on the fact that I may be over complicating the ...
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0answers
27 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
69 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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0answers
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Finding the impedance of a distribution line from R,X,C values [closed]

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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2answers
101 views

Why does the \$ Q\$-factor depend on the resonant frequency?

The \$Q\$-factor is defined as $$Q=\frac{\omega_{0}}{\Delta \omega},$$ where \$ \Delta \omega\$ is the bandwidth around the resonant frequency \$ \omega _{0}\$. For a series RLC circuit, $$\Delta \...
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2answers
95 views

Calculating Differential equation RLC Circuit

Hi, I tried to find the voltage on the capacitor as a function of time, Vc(t). In the initial condition (t<0) the switch was closed and the current source was open circuit, so I found the initial ...
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2answers
98 views

Design a passive amplifier

I am trying to increase the amplitude of my generated electrical signal by a passive amplifier. I have seen so many complex RLC circuits. But I have limited space for design, therefore, can I use a ...
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2answers
55 views

Derivation needed

I am using a chip that has the following circuit in it where V_in is inputted on the left and V_out is measured on the right. This circuit is sometimes called the "lumped-element delay lines." I was ...
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1answer
107 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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4answers
104 views

How to model a load as combination of RLC (resistance, inductance capacitance?)

I have a constant voltage DC power source and a load connected accross it. The load consists of various sensors, modems, some small actuators, and something else which I don't know (mostly resistive.)...
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3answers
71 views

Controlling brushed motor speed with variable load with a PWM

I am considering driving a brushed motor driver with an H-bridge and PWM. I'd like to roughly control the motor speed regardless of the motor's load (envision a small robot climbing/descending hills). ...
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1answer
129 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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1answer
69 views

How does an LC network enable a shoot through state for an inverter

I was researching about inverters when I came across the Z source inverter. The Z source inverter is unique in a sense that it enables a shoot-through or a short circuit condition by closing any two ...

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