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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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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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45 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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42 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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69 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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55 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
43 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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30 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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55 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
25 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
56 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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66 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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39 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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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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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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65 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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32 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
95 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
56 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 ...
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30 views

Permeability and permittivity measurement using Nicholson-Ross-Weir method

I am currently trying to implement the Nicholson-Ross-Weir method in order to extract complex permeability and permittivity values from transmission and reflection measurements using a VNA. For this, ...
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3answers
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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
31 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
51 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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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
60 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
22 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
50 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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40 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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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
119 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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52 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
38 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
59 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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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
58 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
79 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
42 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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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 ...
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1answer
71 views

How do I determine the impedance of Z in this circuit?

I have a circuit shown as follows: Known values: V1: 5 VRMS, F = 4kHz. V2: 0.5 VRMS @ -28.8 degrees. Impedance Z = r + L + C. How can Z be determined? I've attempted to solve this quickly, does ...
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1answer
129 views

RLC Low-Pass Filter with MATLAB

I'm trying to refresh my knowledge on RLC filters, and I'm using MATLAB to model it. Given an RLC circuit with the elements in series, taking the output at the capacitor should result in a 2nd-order ...
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1answer
50 views

Parallel RLC bandpass filter Bandwidth incorrect

I have been trying to create a bandpass filter with the cut-off frequency at \$\mathrm{200Hz}\$ and \$\mathrm{4800Hz}\$ I have managed to get the centre frequency to \$\mathrm{2500Hz}\$. The bandwidth ...
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1answer
93 views

Passive band-pass filter conceptual analysis

I'm trying to chain a high-pass filter and a low-pass passive filter together to form a band pass filter to illustrate how you can combine filters together, but I'm having issues trying to understand ...
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54 views

Finding initial conditions for a series RLC circuit

I am trying to find \$v(0^-)\$ and \$i(0^-)\$ for the step response of a series RLC shown above where R = 330 ohm. I know that at \$t = 0^-\$, the circuit is in steady state so that the inductor acts ...
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1answer
66 views

Network Resistance equivalent

simulate this circuit – Schematic created using CircuitLab I am having difficulties in simplifying and finding the equivalent for the circuit shown. Can someone guide me to the appropriate ...
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1answer
54 views

Finding the time constant of an RL circuit

I've the following circuit: simulate this circuit – Schematic created using CircuitLab And I've to find the time-constant of the voltage across the inductor. I did the following: The voltage ...
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1answer
74 views

What would be the consequence of the inductor saturating?

The following is a section from a book where it is talking about decoupling by LRC at supply terminals. I highlighted the sentence where I didnt understand: I read that if an inductor has an iron ...
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2answers
111 views

Find Voltage of inductor in LC series circuit with resistor in parallel

I have a LC resonance circuit with a resistor between the capacitor and inductor: simulate this circuit – Schematic created using CircuitLab I want to find the Voltage at L1, more specifically ...
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Thevenin Equivalent Voltage: why ignore the 3-kΩ resistor?

In order to find the Thevenin voltage here, why is it that the 3k Οhm resistor is ignored and no current goes through it? (hence \$V_{TH}=8mA \cdot 7kΩ = 56V\$)
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How to smooth changes in *current* in a current meter?

I have a milliammeter I'd like to debounce with an \$f_c\$ of say 0.1 Hz (10 s) to where it reads a mean average rather than however fast the needle moves, dampened only by physics. Vcc is about 8-9 V ...
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47 views

RLC circuit with intial conditions

The circuit I have is given by the following schematic: simulate this circuit – Schematic created using CircuitLab I know a few things: The current in the circuit at \$t=0\$ equals \$\text{I}...
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3answers
110 views

Why parallel LC oscillator producing very high voltage?

I was trying to generate 1 MHZ frequency using LC parallel circuit using 2.53 mH inductor and 0.01 nF capacitor and I ...