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# 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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### Does this op amp connected to an LC tank amplify its resonant frequency?

The circuit below has a resonant frequency at 159.155 kHz and should amplify it: That's exactly what this sweep predicts: But,even when setting V1 to 159.155 kHz the transient analysis shows no ...
• 755
0 votes
4 answers
135 views

### How to analyze a current sink for an ideal power amplifier

In preparing a design for a MOSFET RF Power Amplifier, I analyzed this idealized circuit: My analysis is in some ways consistent with simulation but in some ways gets very different results. Is my ...
• 755
4 votes
2 answers
287 views

### Order of an RC circuit and independent initial conditions

I am trying to determine the order of the transfer function of the RC circuit shown below. I learned that the order of the transfer function is equal to the number of independent initial conditions ...
• 115
0 votes
3 answers
172 views

### How to find a characteristic equation for the current response for this circuit?

Source: Linear Circuits Time Domains, Phasor, and Laplace Transform Approaches Third Edition. author: Raymond A. DeCarlo, Pen Min Lin Publisher: Kendall Hunt Publishing Company I suspect this solution ...
• 157
0 votes
1 answer
67 views

### Different frequency responses for series RLC series circuit using Multisim vs. MATLAB

I have been trying to simulate the following RLC circuit: When I simulated in Multisim Live I obtained the following frequency response, which I expected based on the values I used to calculate ...
0 votes
1 answer
111 views

### LC filter - single-phase inverter

There are LC filters put at the output of the inverters to filter and produce a pure sine wave. There is no clearly calculated and well explained document about this topic. The first picture shows a ...
• 301
0 votes
2 answers
65 views

0 votes
2 answers
288 views

### 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 ...
• 155
2 votes
1 answer
82 views

### 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\...
• 23
0 votes
1 answer
48 views

### 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.
• 433
0 votes
4 answers
153 views

### 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; ...
0 votes
1 answer
60 views

### 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 ...
• 904
0 votes
0 answers
124 views

### 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 ...
• 101
2 votes
1 answer
133 views

### 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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0 votes
1 answer
311 views

### 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.
0 votes
3 answers
235 views

### 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 ...
• 12k
0 votes
1 answer
147 views

### 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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