# 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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2answers
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### 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 ...
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 ...
0answers
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 ...
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 ...
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.
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 ...
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 ...
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 ...
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 ...
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 ...
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. ...
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 ...
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 ...
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 ...
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 ...
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 ...
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 ...
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.
0answers
204 views

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 ...
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?
1answer
64 views