# 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 questions
Filter by
Sorted by
Tagged with
41 views

### 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 ...
67 views

### 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 ...
57 views

### 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 ...
40 views

### 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 =>...
254 views

### 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 ...
1 vote
121 views

### 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 ...
1 vote
85 views

### 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 ...
51 views

### 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 ...
63 views

### 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 ...
149 views

### 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 ...
74 views

### 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 ...
1 vote
50 views

### 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. ...
695 views

### 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 ...
118 views

### 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 ...
144 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 ...
79 views

81 views

### 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)...
146 views

### 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 ...
1 vote
97 views

### 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 ...
1 vote
273 views

### 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 ...
184 views

### 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 ...
210 views

### 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 ...
1 vote
106 views

### 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, ...