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.
756
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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 ...
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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 ...
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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 ...
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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 =>...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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.
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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 ...
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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 ...
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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 ...
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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\...
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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.
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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; ...
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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 ...
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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 ...
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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 ...
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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.
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Using inductor on PCB component power rails
Here is excerpt of a schematic from an FPGA board. It shows some ICs that generate clock signals. This implies a whole lot of switching activity.
I assume based on what I know about power supply ...
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Antenna tuner for 1MHz to 150MHz
I am trying to build an antenna tuner for my 2m (1m + 1m) dipole antenna. It has a 1:1 balun and is connected to a coaxial cable which is connected to my radio with an impedance of 50 ohm. I can't ...
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3
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RLC circuit transfer function
I'm trying to obtain the transfer function which relates the input voltage with the inductor's voltage H(s) = Vl(S)/U(s)
so far I've tried to use Kirchoff's Laws in order to find it. Any suggestions? ...
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How we change equations in passive bandpass filters?
I tried it myself, but I couldn't understand how the equation ended up in the given form. After bringing it to that form, the cutoff frequency values can be determined, but since I couldn't do that, I'...
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Network synthesis. What kind of knowledge do I need to solve this question?
Below is my homework assignment related to network synthesis. I have never seen this type of question before and no idea how to start the solution. Can somebody give me some kind of hint to start it ...
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2
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Why are active filters preferred over passive filters?
This question was asked to me in an interview. I replied that passive and active filters both have their merits and demerits :
Unlike passive, active filters provide mechanism for gain adjustment
...
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How to apply KVL with current source?
In order to write an ODE for the inductor current I have to write a KVL equation that includes the current source. How do I do that?
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Online motor inductance measurement at different rotor angle
I wanted to measure the inductance of PMSM at different rotor angles. I'm familiar with the offline methods of measuring motor inductance but would like to measure a motor's inductance while it's ...
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2
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How to calculate the LC filter output voltage with a specified frequency?
simulate this circuit – Schematic created using CircuitLab
I have a LC low pass filter, L=39 mH, C=0.45 uF. How to calculate the voltage across the capacitor? The voltage can be magnified at ...
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What is the frequency at which a series RLC circuit stores maximum energy?
I was reading about the quality factor of a series RLC circuit. The quality factor is defined as
$$2\pi*\frac{\text{maximum energy stored}}{\text{total energy lost per period}}$$
Here maximum energy ...
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Sign convention to use in Nodal Analysis
simulate this circuit – Schematic created using CircuitLab
We know that current flows from higher potential to lower potential in a resistor. In this question, we make use of nodal analysis and ...
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How to make amplification circuit for WWVB PWM signal from Raspberry Pi
I’m trying to follow this video since I’m experiencing the same problem with my WWVB radio controlled clocks (can’t get signal where I live) and thought it would be a good excuse to learn a bit about ...
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How can my crossover be improved? Efficiency is too low
I have been working on redoing the crossover for a pair of Dayton audio B652 Speakers, and have just been working on it through a breadboard for practice. I bought a bunch of cheap parts from bojack ...
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How do you use an RC filter on an LNA output to reduce unwanted noise?
We designed two low noise amplifiers, one at 144 MHz and another at 440 MHz using this LNA; each design is tuned for the particular band. We noticed amplification at 440 MHz is clean and crisp, but ...
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Solving for current in RLC circuit with Laplace and steady-state solution
The following parallel RLC circuit is example 8.8 in Fundamentals of Electric Circuits by Charles Alexander.
In the example in this text, the current through the inductor i(t) is found to be:
$$i(t) =...
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Potential should be same for zero current
In the above circuit, I have to adjust variable resistor R such that current across Load resistor RL should be zero.
Which means the voltage across RL should be same. Do i have to use KVL supernode ...
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Resources for impedance matching networks
I am working on my first hobby PCB design project that includes RF components. On one hand, I have a 2.5GHz WiFi signal and an 868Mhz LoRa signal.
I copied the matching networks from the reference ...
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Parallel RLC circuit doesn't produce expected results in Multisim
I am trying to create AC from DC. My device is based on the transient response of a parallel RLC circuit:
simulate this circuit – Schematic created using CircuitLab
If there is some energy ...
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2
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Finding the transfer function and damping coefficient an LCR circuit
I am trying to determine the general transfer function of the following circuit.
Shouldn’t the transfer function just be \$R + \frac{Z_CZ_L}{(Z_C+Z_L)}\$? I am trying to then use the transfer ...
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How to match a network over multiple frequencies?
I'm trying to match the following network using the Matching Network Designer so that the resistance curves (solid lines) get pulled towards the horizontal line and the reactance curves (dotted lines)...
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How to find a linear RLC circuit from its transfer function?
I have a transfer function, for example:
$$H(s)= P\frac{10}{s(s+5)(s+9)}$$
See the figure below.
How do I make a linear RLC circuit from this transfer function, without using an op-amp, but a linear ...
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How to implement a passive RLC circuit from transfer function?
I'm designing a passive filter for a power electronic circuit.
Theoretically I have obtained a transfer function of a passive filter that fits my requirement. But I don't know how to implement it ...
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What is the difference between Smith charts plotting Z11 and S11?
Background
In the process of trying to fix an LNA input impedance match, we discovered we need to understand more about Smith charts! The question is the at the bottom of this post, here's some ...
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Algorithm for impedance calculation from known I and V sinusoids, L and C unknown
I am trying to extract the impedance from a sampled signal. Specifically, I have only noisy samples of a sinusoid, of a single period, of current and voltage at a given known frequency. I am trying to ...
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Unexpected output from LC circuit
I am trying to get back into some electrical engineering basics, and had a quick question regarding an unexpected output I am seeing. I am trying to learn about RLC circuits again, and wanted to build ...
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Synchronization of two RLC circuits
simulate this circuit – Schematic created using CircuitLab
Suppose x amperes passes through the resistor R in circuit 1. Now if both switches in circuit 2 are turned on in synchronized manner, ...
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Parallel RLC time domain response, with two specified initial conditions and no driving source -- it is an homogeneous system
This question is inspired from Andy Aka's question from almost 5 years ago. It is also a nod of my respect to Andy. But what I wrote there is kind of muddled. And it only addresses the under-damped ...
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Does the impulse response of a system include both its transient response and steady state response?
Suppose you connect a circuit containing passive elements like resistors, inductors and capacitors to a voltage source. Now you provide an impulse to the circuit. Is the response by the circuit the ...
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