# 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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### 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 ...
620 views

### 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 ...
42 views

### 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 ...
30 views

### 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 ...
39 views

### 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 ...
137 views

1 vote
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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 ...
1 vote
106 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 ...
119 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 ...
204 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
94 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, ...
319 views

### 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 ...
84 views

### 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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### Non Zero Voltage Across LC Series Resonance Circuit

I'm simulating a series resonance RLC circuit using the TINA-TI. The resonance frequency for the circuit is 85 kHz. I did notice that when measuring the voltage across the capacitor, the voltage is ...
74 views

### Painfully Yet Steadily Growing Oscillator Output

I have worked out an LC-based Colpitts Oscillator (sharing the schematics) that produces output which grows painfully slow from 10 pV to 500 mV in more than to 3 minutes and settles there. Despite ...
350 views

### Finding resonant frequency in a circuit with no inductor

I have a parallel circuit and I need to find its resonant frequency. However, there is only a capacitor paralleled with a resistor and there is no inductor included. So is it correct that in using the ...
50 views

Here's what I do when I see a problem like this one below: On the left side of the circuit I see resistors in parallel, I calculate 1/20 + 1/20 and then take the inverse. Then I add the 10 Ω resistor ...
1 vote
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### Two-Port Network with Sources. How to cascade the Chain Matrix?

From EMC Analysis Methods and Computational Models by Tesche on page 61 we can see a chain matrix representation of two-port networks with sources (as seem in the attached image). Lets assume I have ...
161 views

### How to solve this problem using transient time-domain analysis?

Find V0(t) in this circuit assuming zero initial conditions. I solved it (refer image above) using frequency-domain analysis using Laplace and found the answer, but I am not able to get the same ...
1 vote
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### RE46C180 -- disabling chamber checks

There are two types of things one can hook up to the interconnect wiring of a multiple station smoke detector: smoke alarms (with their own detection chamber, control chip, and horn) and auxiliary ...
162 views

### LC filter inductor is making noise

Inductor IN3 is making audible noise while I connect to 12V, 830mA supply from an AC/DC converter. L1 is not present. It has been shorted. U1 is an LM2576 from TI. What might be the reason for this? ...
532 views

I have two outputs of a voltage source that do ±10 V with 16 bit. This leads to a theoretical resolution of a bit step of 0.3 mV. My goal is to have more resolution by using a voltage divider of 100 ...
93 views

### Initial current

In the following circuit, would the initial current used for the S domain transformation be i(-0)=0 or i(+0)=7/4, assuming the switch closes at t=0, taking into account i(-0)=i(+0)? simulate this ...
178 views

### General statement about arbitrary two-port resistor networks

Suppose I have a resistor mesh that is acting as a two-port network. I'm feeding in $V_\text{IN}(t)$ and I'm reading out $V_\text{OUT}(t)$. Here's an example of a potential circuit: Is it true ...
265 views

### Charge sharing in capacitors with switching pulses

I can solve the output voltage for the given circuit below as the clock pulses increase. To find a steady-state value, I found the output voltage till it remained constant (around five clock cycles). ...
152 views

### Find capacitance such that voltage and current are in phase

I just cannot solve this exercice, any help? This is what I have tried:
1 vote
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### Designing bandpass filter for audio amplifier

I am a 3rd year engineering student currently working on a project where I need to basically make an ultrasensitive metal detector. Basically, I need to create an alternating magnetic field by ...
464 views

### Series RLC - how does resonance amplify?

A series RLC circuit has a resonant frequency f0. If I apply a sinusoid at frequency f0 to this series RLC circuit, the output of the RLC should be a oscillation at frequency f0 with an amplitude ...
1 vote
282 views

### Synthesizing an impedance given by transfer function (poles/zeros) using a passive network

I would like to synthesize an arbitrary passive network based on a given transfer function (poles/zeros). The origin is the output impedance of a voltage regulator for which I want to find an ...
218 views

### Current source in parallel with a short circuit

If a Dependent current source is placed in parallel with a short circuit, to solve our calculations would we assume that no current will flow through the dependent source and hence we remove it. For ...
43 views

### Creating equivalent impedance for given measured frequency response (that does not involve blind trial-and-error)

I have a measured frequency response and I would like to create an equivalent impedance model for it. I start with a parallel RLC and then add series R and series L to the elements. I blindly tune the ...
175 views

### Magnitude and phase of parallel RLC with series resistor

I have been looking for a while for this issue, but unfortunately I am bit stuck on getting the magnitude as well as the phase of a RLC circuit with a series resistor, seen from V1 (see picture). ...
1 vote
131 views

### What conditions can cause a PCB fuse to fail and act as a resistor?

Context: Tx circuit that shoots 24V pulses into a transformer to get 240V out of it. The purpose is to drive a piezoelectric transducer. The circuit itself has a fuse protecting it at the entrance (...
182 views

### Which matrix index should be used when Y (admittance) is shown to compose a circuit segment mapped to an ABCD matrix? Y21? Other?

I would like to cascade a serial capacitor with a shunt inductor to form an L-match network by multipling two ABCD parameters and convert the result to S-parameters that represent the composite ...
1 vote
139 views

### RLC circuit equation

I want to make equation that describe relation between vi and vc. I did it like this. Is this right way?
1 vote
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### What is up with this series/parallel calculation? Inverse Laplace looks strange

I'm trying to find an analytic solution for this circuit. If the cap is inverted (series resistor to ground) the solution is straightforward. In this case I ended up with a strange cos term that makes ...
1 vote
When I studied second order system and thus natural, damped and resonant frequency I wondered if the resonant frequency I find using the formula $w _ { r } = w _ { n } \sqrt { 1 - 2 D ^ { 2 } }$ ...