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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24 views

Differential equation of a RRC circuit as Voltage output/voltage input?

So in this presentation i have got, there is a RRC circuit, and they get this differential equation, but there is no procedure explained how they have got it. This is basicially a series RRC circuit ...
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3answers
52 views

Difficulty in understanding the paragraph concerning h- parameters

This is a paragraph from "Engineering circuit analysis" by W H Hayt. I really don't understand the statement "it is difficult to open circuit the open terminals...." What does he mean in the paragraph?...
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3answers
100 views

Why can RLC resonance be dangerous for electronics

There is a lot of information about RLC circuits and resonance, and many times it is mentioned that when a series (parallel) circuit resonates, a really high voltage (current) can be found across the ...
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17 views

Phase margin Vs damping ratio: Intutive explanation

While designing the compensator for SMPS we always talk about the relation between phase margin and damping factor( or Quality factor). I don't completely understand how damping plays such a keyrole ...
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1answer
94 views

Toy “pull tab”-style feature on PCB

I have recently designed a passive-based modular PCB. When I click the secondary board into the base board, I would like it to break the current circuit at a fixed point, and insert itself in series ...
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21 views

T - matching network design

can you help me on understanding the procedure to design this T - matching network? My aim is that of transforming a resistive load R to a complex value R'', while R' indicates an intermediate value....
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1answer
42 views

Quartz Crystal and Resonance Frequencies

Let's consider this equivalent electrical model of a crystal: The evaluation of its series self resonance frequency is quite simple: it is sufficient to impose that the reactance of L1 is equal and ...
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2answers
46 views

Getting negative energy in a coil (RLC-circuit) after opening the switch

I've the following circuit: simulate this circuit – Schematic created using CircuitLab The switch was 'forever'closed and a certain time \$t=0\$ I open the switch. I tried to find the energy ...
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0answers
47 views

Always starting LC colpitts oscillator

Is there a way to make an LC oscillator that works in most circumstances? Which is able to start up an keeps oscillating for a wide range of inductors? I'm asking this because I made a LC oscillator ...
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3answers
67 views

Quartz Crystal Electrical Model

I need some explanations about the electrical model of a Quartz. Everywhere I search the definition of quartz I find that it is a crystal that starts oscillating mechanically if it receives a ...
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1answer
72 views

Second order RLC circuit problem about signs

Consider this circuit. Which is a second order RLC circuit. The problem asks for value of \$\phi\$ from the initial conditions. I took the first derivative of the equation by hand but as you'd see ...
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1answer
23 views

ILC circuit second order equation

Consider this circuit. The question asks for write an algebraic expression for the second derivative of the inductor current in terms of the source current \$I\$, the inductor current \$iL\$, the ...
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1answer
62 views

Identify the element among RLC

question : A two terminal network consists of one of the RLC elements . The element is connected to an a.c. supply .The current through the element is I A. When inductor is inserted in series between ...
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4answers
93 views

Is it possible to use a DPDT switch to swap 2 inputs and 2 outputs?

I want to create a passive device with two MIDI inputs and two MIDI outputs, with a switch that has two states. In the first state, input 1 is connected to output 1, and input 2 is connected to output ...
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2answers
62 views

Identifying a LC oscillator circuit and solving resonance frequency

Could someone please identify what type of oscillator this is in the first stage. I'm not quite sure if it is a Colpitts or not and also could someone specify the resonance frequency calculation if it ...
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1answer
54 views

RL circuit unit impulse response

Consider this circuit. We apply a unit impulse \$\delta(t)\$ that is \$v_{IN}(t) = 1 \delta(t)\$ volt-seconds. That is, \$v_{IN}\$ is a unit impulse at time t = 0. Since this circuit is driven by an ...
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2answers
48 views

Finding the settling time of an oscillatory response

I was reading my book on circuit analysis on chapter about RLC response and became curious about how to get an approximate value for the settling time of the response. Particularly this response ...
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1answer
74 views

What will be Resistance for maximum Power transfer from network A to network B?

simulate this circuit – Schematic created using CircuitLab Can we apply Maximum Power transfer theorem if we are given two networks both with voltage sources. In solution it was said that for ...
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2answers
60 views

Voltage spike at the coil when opening the switch [duplicate]

I've the following circuit: simulate this circuit – Schematic created using CircuitLab In my book they stated the following sentence: After that the switch is closed for a long time, I let ...
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1answer
44 views

Voltage exceed source voltage over a coil when opening a switch

Well, I have the following circuit: simulate this circuit – Schematic created using CircuitLab When the switch is closed for a long time, the current that is flowing trough the resistor \$R_1\$...
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0answers
34 views

How to solve a RLC circuit with a dependent current source

I am working on the following RLC circuit in the drawing. I am stuck at the part where the switch goes to 'b'. That's where the dependent source comes to play. Should I use nodal analysis or find the ...
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0answers
76 views

Finding the voltage across an inductor in a RLC circuit

Well, we have the following circuit: And I need to find the voltage at the node \$\text{Y}_1\$. My Work: The input voltage and current relation is given by: $$\frac{10}{s}=i_{in}(s)\cdot\frac{1}{\...
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1answer
40 views

AC signal analysis: Voltage dip (amplitude dip) at time = 0

I'm working on a series RLC problem where the input voltage is a sinusoidal function for all time. The catch is, for t < 0, the sinusoidal function is of greater magnitude than t >= 0. There is no ...
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1answer
82 views

How to solve infinite grid with the observing terminals at diagonal of infinite square matrix?

The answer given is 2/3ohm solution is not given but I can expect how they got that answer but can't justify the way.
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2answers
74 views

Butterworth passive filters normalized values equation

Recently I'm reading in-depth about butterworth filters, more specifically about the normalized values the tables give. Most of the tables give you the normalized values for the case of RL/RS=1 or RL/...
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1answer
49 views

What is difference between natural response and zero-input response of a system and how to find natural response?

In most books it is said that natural response is another name to zero-input response while in some resources is is mentioned that the classification is based on poles of transfer function and input....
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3answers
464 views

Inductor and capacitor for energy storage instead of battery

I am trying to see if it would make sense to use a LC network to store small amount of electrical energy (500 mWHr or less) as an alternate of a 3.3 V battery. What I understand is that L and C are ...
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2answers
93 views

How is it possible that an LC Oscillator create a sine wave?

I have a question, for example look at this circuit: 1)How is it possible if this circuit can oscillate, for example taking on the capacitor full charged, and the inductor full discharged, the ...
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78 views

wrong frequency of LC based generator with LM311

I have a problem with the frequency of LC meter based on comparator (a very popular solution, similar to this one: http://www.vk6fh.com/vk6fh/lc_meter_vk6fh.htm). I have recreated generator part in ...
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35 views

How equate capacitor's voltage for mixed series paralell RLC circuit

I need to find the voltage's equation across the capacitor in the schematic below using differential equations. My professor said that it's a simple matter of finding the natural and step responses ...
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1answer
118 views

How to sketch the Bode diagram of the output filter of a Buck converter?

I'm trying to figure out the Bode diagram of the output filter of a Buck converter: simulate this circuit – Schematic created using CircuitLab Vout is ...
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2answers
72 views

Ideal LC circuit decays over time in LTspice

I was trying to simulate a transformer without a load, and setting an initial condition to observe how the energy will flow from the primary to the secondary circuit. I realized that the energy will ...
2
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3answers
107 views

High Q peak in frequency response means what in time domain?

Reading Linear Circuit Transfer Functions and one of the graphs got me curious. I've recreated the circuit (series RLC) and plotted the frequency response for a Q of 7. We have a peak of ~16.3 dB ...
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1answer
33 views

Designing a network to fit specific amplitude and phase response curves

If we are given a frequency response curve made up of the amplitude (magnitude) and phase (angle) responses, is it possible to design an electronic network with a transfer function identical to the ...
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2answers
66 views

Dividing in Polar form

When dividing in Polar form 31.2/5.74 becomes 5.44. The angle for 31. 2 is 0. So when it comes to solving imaginary number 12. 8 why is the - 12.8 degrees?
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31 views

Passivity of impedance matrix on the imarinary axis

According to this paper, Section V-C, a rational impedance matrix Z(s) is the impedance of a passive lumped system if and only if the following four conditions are satisfied: 1) each element of Z(s) ...
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1answer
61 views

Proper way to solve first order circuit with voltage dependent voltage source

Original question from the text book with answer provided: My attempt at solving this problem using mesh current loops: For loop 1: $$V_H + V_x + 1(i_1 - i_2) + 2V_x = 0$$ For loop 2: $$-2V_x + 1(...
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1answer
27 views

enveloping curve - LTPSICE

I have built a simple rlc circuit with a pulse input and performing transient analysis on it. I am interested in the voltage of the behavioral voltage source as shown in circuit. The system is an ...
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1answer
54 views

Do we have a peak in an overdamped RLC circuit?

Consider the natural response of a parallel RLC Overdamped circuit, we're required to find the time it takes for the voltage across the Resistor to reach it's first peak. I got the equation for the ...
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1answer
46 views

Why do we not consider Thevenin Voltage source while dealing with Dependent sources in RLC circuits?

"If no controlling current or voltage associated with the dependent source is of interest, we may simply find the Thévenin equivalent connected to the inductor and capacitor." This is what's written ...
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0answers
41 views

Calculate U(t) when capacitor C1 charges C2 via a resistor R

simulate this circuit – Schematic created using CircuitLab The switch SW1 is activated at t=10s and charge from C1 is transferred to C2. The power supply charges continuously with 1kV 1mA. How ...
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1answer
126 views

Capacitors in parallel going negative

Interesting (maybe?) question here which I am struggling to answer. Hoping someone can help. I have a capacitor network; 5 caps in parallel and then two modules of that configuration connected in ...
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0answers
55 views

Distributed LC vs Distributed RC

The usual rule with LC circuits is to use the lumped model if the circuit is considerably smaller than the wavelength, or if the propagation time is considerably smaller than the rise time. With RC ...
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1answer
41 views

if settling time is smaller for underdamped case then why we call it underdamped - parallel rlc circuits?

Does less settling time means that the response dies out quickly? If so the settling time for a just correct Resistance such that the circuit is slightly underdamped is least, then it's most damped(...
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1answer
88 views

LC ringing on synchronous buck converter

I am working on a board that uses LTC3891 as a buck converter to step down 24V to 12V. There is quite a significant oscillation at the switching node, upstream to the inductor which I am curious about....
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2answers
86 views

How to tackle circuit containing time variable resistor?

simulate this circuit – Schematic created using CircuitLab For instance above schematic find current as function of time in circuit above I studied it about months before and am not able to ...
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1answer
59 views

Mesh Analysis has failed to solve this circuit

I built the following circuit in LTSpice and found each mesh currents to be (which also matches the answer sheet provided by my professor): i1: 9A i2: 8A i3: 11A i4: -6A However, I am unable ...
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1answer
106 views

Quality factor of RLC circuit

I am trying to calculate the quality factor for the response curve of a series RLC circuit. I measured the voltage across the capacitor at several frequencies and calculated its ratio to the forcing ...
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2answers
45 views

transient analysis with time varying Resistance

As we know in frequency domain V(s)= I(s)Z(s) then in time domain it should be V(t)= I(t) Convolution Z(t) instead of V(t)= I(t)Z(t) ?
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3answers
99 views

Inductance value of an Isolation Transformer

There is a small isolation transformer 'L1' of 1:1 ratio as shown in the image. A 0-24V, 75kHz square wave is applied from push-pull mosfets stage at the 'V_SW' input of the circuit. I want to find ...