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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71 views

Proof that RLC networks are linear?

I've been learning about RLC networks, superposition, two-port circuits etc. and a lot of derivations and equations implicitly assume the fact that the circuits in question are linear, no matter the ...
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0answers
29 views

Zero-state response/Zero-input response vs forced and natural response

I'm having some confusion regarding the differences between the zero-input response and the natural response. And also between the zero-state response and forced response. I read the following but I'm ...
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14 views

How do you estimate diplexer isolation between ports 2 and 3 when S23 overlaps S32 and the curve is not flat? (see the graph)

The graph below shows S21, S31, S23, and S32 for a 3-port diplexer (1 in, 2 out) made from a high-pass Pi and a low-pass T network. The target frequency ranges are 144-148MHz and 430-450MHz. Note ...
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1answer
38 views

Independent and dependent initial conditions

Consider the RLC circuit below. In fact, it is a normalized filter with Butterworth approximation of 3rd order. Now suppose that for some reason I am interested in the time domain formulation. Using ...
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1answer
52 views

How to design LC filter for inverter and for rectifier? [closed]

Asking about the way to design LC filter for inverter and for the rectifier. Hope it is clear now.
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2answers
67 views

Voltage of capacitor in underdamped RLC circuit

I have this circuit: simulate this circuit – Schematic created using CircuitLab If the capacitor is precharged this circuit has an underdamped response and for VC1 = 10V the equation for ...
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0answers
35 views

Solving LC diff. equations in C [closed]

I wrote diff. equations for LC circuit and after numerical solving/ploting i found the results after few periods runs away if itteration step isnt small enough. I use a step dt=T/16 (16 itteration per ...
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1answer
55 views

Q factor in RLC circuit

According to Wikipedia the definition of the Q factor it is the ratio of energy stored/energy dissipated per cycle*2π If we have an underdamped oscillation of a RLC circuit does this mean for every ...
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6answers
258 views

Network magnetics: Getting information past a “dead” wagon in a tunnel

I'm actually a mechanical engineer, so I'm not very versed in electronic design, here goes: I want to design an inductively-coupled network connector for the rail industry. The goal is to have a data ...
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1answer
45 views

LC filter input and output resistors?

I'm using rf-tools.com LC filter designer to design a passive 4 pole filter for an active subwoofer. The response is not what I expect, it's not showing any attenuation which seems to be good to be ...
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1answer
48 views

Low-pass filter LC for PWM

In the following application I want to control a DC motor powered in 24 V and about 50 W. For that I use a microcontroller of the STM32 range which will be able to provide me a PWM signal of 200 kHz. ...
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0answers
61 views

Designing an LC output filter for a DC-DC Boost high power system (2 MW)

I am currently designing a dc-dc boost high power system. The input voltage is boosted from 1 kV to 1.2 kV. The rated power is 2 MW and the switching frequency is 2 kHz. Due to the boost concept of ...
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0answers
45 views

The role of a transistor in a magnetostrictive oscillator circuit

Could someone please explain the role of the transistor in this circuit? I have a feeling it has to do with the LC circuit but I'm not sure and don't understand completely. The following is an image ...
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5answers
1k views

Why do I get this weird curve for impedance vs Frequency

I am currently working on a simulation for an RLC circuit in Pspice, I am trying to plot the impedance vs frequency curve. After a good while of trying out stuff, I always get such weird curve. Not ...
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1answer
47 views

LC circuit voltage

Suppose we have this LC circuit and assuming the capacitor is precharged with its voltage pointing to the left(left plate has an excess of negative charges and right plate has an excess of positive ...
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1answer
29 views

Quality factor multiple definitions

On studying RLC circuits, I have come across two definitions of Q factor. One is obviously the measure of selectivity and goes as this: The other is this: Is there any link between these 2 ...
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1answer
54 views

LC tank circuit behavior

Today in our lesson we did the LC tank circuit and its natural response frequency.I get how the equations work but what I didn't get is a qualitative explanation of what's going on.I mean why does the ...
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4answers
149 views

RLC circuit square wave input , why isn't the output a square wave?

In an RLC series circuit if we provide a square wave signal to it, why is the output signal at R not also a square wave? Is it sinusoidal wave? I am running the simulation on Multisim.
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0answers
204 views

Transient buildup of capacitively coupled transistor amplifier

I'm trying to understand the following section from "Communication Circuits: Analysis and Design" by Donald T. Hess: Here \$W(t)\$ is defined by $$W(t) = e^{\frac{q(v_i(t) - v_{imax})}{kT}}...
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2answers
97 views

Confusion in modelling of total loop inductance of a rectangular loop

I was reading an article about partial and total loop inductances from this site and in a section where for calculation of total inductance of a rectangular loop is given as: In each portion of the ...
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2answers
54 views

Circuit for simulation

Can someone please help solving for my circuit connection, I'm new to this and somehow didnt manage to simulate the circuit correctly as the software stated this Warning: Inductor-voltage source loop ...
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4answers
112 views

Resonance Frequency of system with two inductors

I am trying to derive a formula for the resonance frequency of the following circuit: The piece that is giving me trouble are the two inductors, that (although I might be wrong) cannot be further ...
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1answer
54 views

ABCD parameters

I am trying to get the ABCD parameters of these circuit but I have no idea about how to solve the circuit. All I know is V1=AV2+BI2 I1=CV2+DI2 But here no impedance is connected. If I short the output,...
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0answers
61 views

LC series circuit resonance beyond voltage limits of programmable capacitor - solvable with gain stage?

I am replicating a design where a mechanical tuning capacitor is in series with an inductor antenna, in order to achieve resonance at certain (hundreds of kiloHertz) frequencies. I am looking into ...
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2answers
180 views

Determine the output voltage

I'm trying to solve the following question: Determine the output-tuned circuit voltage in Fig. 4.P-7. The tuned circuit is resonant at \$\omega_0\$ and has \$Q_T = 20\$. My try: I don't know how to ...
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2answers
78 views

Impedance matching vs LC filter

I have noticed in many papers, publications and in general application the use of LC filter for impedance matching. I wonder why this is the case? How is it that by using an LC filter, it can be used ...
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0answers
25 views

LC VCO sub 30nm node circuit and layout design

I am working on an LC VCO in a sub 30nm node to oscillate between 3 to 6 GHz. Here are the things I did so far: I already have the layout and extracted netlist for the integrated coil, L. So I did ...
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0answers
62 views

Nonlinear circuit and RLC

I'm trying to solve the following question from "Communication Circuits: Analysis and Design" by Donald T. Hess: For the circuit shown in Fig. \$1.P1\$, determine an expression for \$v_o(t)\...
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1answer
50 views

Explanation and Draw of Line Impedance Stabilization Network (LISN)

I am trying to learn about LISN circuits. As far as I see, there are standards for LISN. But the point is everybody is applying standards, I would like to know why these values are chosen or why there ...
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1answer
58 views

About series RLC circuit

Here I am trying to solve the circuit and from my calculation, I got, I(t)=3e^(-2t) - 3e^(-3t) and Vc(t)=12-18e^(-2t)+12e^(-3t) When Initial conditions are; I(0-)=0A and Vc(0-)=6V From my assumption, ...
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3answers
90 views

What's the correct approach to this RLC circuit problem about RMS voltage?

How are you supposed to determine \$V_{C,RMS}\$ without R, L or C? I drew a phasor diagram and used \$Z=\sqrt{R^2+(X_L-X_C)^2}\$ but am unsure on how to proceed from here as I do not have values of R,...
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1answer
68 views

Voltage surge suppression technique in high-speed switching based electronic circuit

I am working on a circuit that transmits ~1MHz sine wave(20V amplitude) in RLC based circuit scheme, also transmits high-frequency signals(pulses(non-periodic)) ~20MHz(10 %DS)(20V) in a CR-based ...
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1answer
40 views

Transient RL circuit analysis

Can anybody help me with the transient analysis problem? I tried to solve and here are my results:I(t)= 2-e^(-2.5t) A i1(t)=i2(t)=I(t)/2 =(2-e^(-2.5t))/2 =1-0.5e^(-2.5t). but if you observe the ...
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1answer
164 views

Damping output filter of buck converter?

Does anybody know if we need to damp the output filter of a buck converter? I came across this paper Passive Power Filters written by R. Künzi. In this paper he suggested an approach to damp the LC ...
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1answer
34 views

LTSpice - voltage goes through the roof in LC circuit

I am trying to simulate an oscillator in LTSpice. So I tried to make a simple LC circuit. Since a voltage source would not make the circuit oscillate, I did not use a voltage source and made the ...
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3answers
152 views

Why does the impedance of a parallel RLC circuit approach infinity at resonance?

Pretty new to this stuff so apologies if I get some words wrong. In the book I'm reading they described a parallel circuit with a resistor capacitor and an inductor powered by a current source. They ...
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0answers
33 views

How to choose cutoff frequency of an LC filter for an isolated voltage converter?

The manual of B0505S states: "It should also be noted that the inductance and the frequency of the LC filtering network should be staggered with the DC/DC frequency to avoid mutual interference.&...
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0answers
30 views

Transmission Parameters for a 2nd order butterworth bandpass filter

I am trying to find the transmission parameters (ABCD parameters) for the above circuit. $$a_{11}= \frac{V_1}{V_2} |I_2=0$$ $$a_{12}= -\frac{V_1}{I_2} |V_2=0$$ $$a_{21}= \frac{I_1}{V_2} |I_2=0$$ $$a_{...
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1answer
73 views

Puzzled by voltage readings of a simple resistor network

I have tried in vain to understand why the voltage readings across the resistors in the simple resistor network below are what they are, but I can't work it out. I know that when you place resistors ...
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1answer
29 views

Why does the Vs node always oscillate around the second harmonic in a VCO tail filter?

Why does the Vs node always oscillate in the second harmonic even if we detune the Cf, Lf tail filter? Is Acos(2wot) always valid for Vs? How is it explained?
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1answer
64 views

Meaning of the determinant of an ABCD transmission matrix

In a thesis, [1] I found the following statement: To determine [characteristic impedance and] dispersion relationships for an arbitrary reciprocal network having the transmission matrix $$ \begin{...
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0answers
48 views

Electric noise filtering seems not to have any effect over voltage input noise

I have designed two PCBs with slave SPI nodes at both. One of the two PCBs is connected to a Raspberry SPI port, it became the master node. This PCB also has a 74HC51 (suggested for i2c and spi lines ...
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0answers
32 views

Passive LC low pass in combination with series resonant/ band stop stage

I found this crossover circuit in a construction set and it puzzled me a while. I have absolutely no idea, why I should combine a 2nd order low pass with half a band stop. The low pass alone has a ...
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1answer
56 views

ATSAM4S PLL LRC filter PCB placement

I'm designing a simple breakout board based on Atmel SAM4S4A MCU. I've downloaded complete design of ATSAM4S Evaluation board and it says that PLL filter is missing in it and refers to AT03463 ...
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1answer
173 views

100Mhz damped Sine Wave

I have simulated an damped sine wave generator in ltspice. Since I couldn't find a model for single pole double throw relay, I used two switch. It is very basic circuit first charges capacitor and ...
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1answer
204 views

Finding upper cutoff and lower cutoff frequencies on notch circuit

I need to find upper cutoff (UCF) and lower cutoff (LCF) frequencies based on formulas of a notch circuit, but I'm getting a quadratic equation (as expected) with an imaginary number (IN; not expected....
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1answer
35 views

Show that adding a series capacitor of value C = 1/(w x L) makes the power factor equal 1 in a series RL circuit

Show that the power factor is equal to 1 when C = 1/WL in an RLC circuit. I've had some problems finding out how to prove this, and I found a similiar solution online. I have some problems ...
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0answers
23 views

How to create/optimize a matching circuit in the middle of a PCB with a network analyzer?

I have a PCB with an SMA connector as only input. The block diagram of the circuit looks like: I would like to update the L-match for optimum matching (L, C1, C2 at 915 MHz). I connect a VNA to the ...
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2answers
130 views

Voltage of parallel components (RLC circuit)

Say we have the circuit above. The 6 A current is applied at t=0. I'm trying to get the voltage across the inductor to get di/dt. If I run this circuit in LTspice, it will show a voltage of 30mv ...
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2answers
88 views

Find the phase angle of the of the sinusoidal input that will make the natural response zero

Say we have a simple rl circuit with R = 0.5 ohms, L = 0.1 H and the sinusoidal input of : $$ V_s = 13800√2sin(120πt+β)$$ Then we were tasked to: I know the form of the solution of i(t) would look ...

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