Questions tagged [analysis]

Questions attempting to analyze the mathematical properties of a formula, the inner workings of a protocol, or the design of a given circuit.

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Conceptual understanding of phase power vs. line power

I am looking at two formulas: P = √3 x VL x IL x Cos Ф P = 3 x VPh x IPh x Cos Ф Now assuming P here refers here to the total power. Could I take VPh and IPh and combine those terms as P (Phase)? Same ...
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Nodal Analysis of an Inverting Operational Amplifier

I am trying to derive the closed-loop gain of a basic Inverting Op-Amp circuit using nodal analysis and the model that includes its non-ideal parameters. The equation I derived is incorrect, and it's ...
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Confusion understanding a half adder implementation using 74153 MUX [closed]

As shown here, I have also highlighted the confusing part in the attached snapshot. In the last line of truth table, I know that sum is equal to XOR of two inputs, but here in the last line of the ...
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Analysis circuit using Thevenin theorem

in the book "Engineering Circuit Analysis", example 5.9, i don't understand few things, hope someone can clear up for me: Why does the dependent current can't flow through resistor 3k? If ...
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Design of power input protection on NVIDIA Jetson Xavier NX (dev kit)

When looking at the schematics of NVIDIA Jetson Xavier NX developer kit, they use a P-channel MOSFET (AONR21357) before bringing power to a buck converter (TPS53015, not represented below). What is ...
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How to Calculate Voltage across R2 for any Value of R1, R2, and Frequency?

I know this is really simple, but I'm really new to electronics, so please bear with me. CircuitLab said that the voltage across R2 was -14.24 dbV, given the component values shown and a source ...
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-1 votes
1 answer
153 views

What is the difference between large signal model/analysis and dc model/analysis? [closed]

I am studying microelectronics. I have studied about the DC analysis and the AC analysis. The DC analysis is just to find the operating point or the quiescent point and then the AC analysis is done. ...
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COMSOL Simulation E-Field Results for AC & DC Difference

The top electrode is at 100kV. conductivity air = 8e-15S/m conductivity insulator = 1e-12,1e-14,1e-16,1e-18 S/m permitivity insulator = 4.8 conductivity electrode = 5.96e7S/m Both the above picture ...
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Frequency domain analysis when sampling a switched (gated) integrator

I would like to use AC analysis (e.g. in spice) on a non-ideal op-amp integrator where the reset switch is open, and then apply a shaping function to the result of the AC simulation (in the frequency ...
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Effects of decreasing the field voltage of a synchronous machine

I am running a simulation of a synchronous machine in matlab and I have some behaviour I cant quite grasp my head around. The machine is running as a motor with only about 20% of its maximum load, ...
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2 votes
2 answers
206 views

Frequency dependent amplitude of a current source in an .AC analysis in LTspice

In my LTspice simulation I would like to integrate a current source in an .AC analysis which has an amplitude that varies over the simulated frequency spectrum, e.g. something like \$A(f) = {A_0 \cdot ...
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Phasor angle calculation

In this example, for Vo it first says it is lagging by -134.8 degrees, however when then calculating actual Iin, the angle for Vo becomes -138.4. I'm wondering if -134.8 is a typo, and if it isn't; ...
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1 answer
146 views

Importing LTSpice plot data in to Excel

Firstly, apologies as it is more of an Excel-LTSpice question than electronics. I have a question regarding “cleaning” the data from LTSpice. I attached a small sample of data representing the gain ...
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1 answer
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Help solving circuit with Mesh Analysis and Current Source

I've been for some hours trying to solve this thing with Mesh Analysis but I don't seem to be able to understand how to do it! Could anyone please explain how I can do this? Disclaimer: I've never ...
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Difference between KVL and mesh analysis

Are KVL and mesh analysis, the same? I am confused. What is the characteristic difference between them?
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3 answers
279 views

Voltage and current [duplicate]

It is proven only when there is a potential difference current flows in that branch between two nodes, then how we say that the current flows in a short circuit where the voltage on that branch is 0?
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AC analysis of voltage divider CE amplifier - how are non-parallel resistors treated as parallel?

The textbook I'm reading (Electronics for Guitarists by Denton J. Dailey) has this to say about the AC equivalent of the circuit: The power supply voltage source VCC provides a low resistance path to ...
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Can FEMM be used to calculate real power of a PMSM at 50Hz frequency?

I am working with FEMM, for past few months and i have this doubt that can real power of a PMSM be calculated using FEMM at 50Hz frequency?.. Because at frequency higher than 0Hz the flux produced by ...
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1 vote
0 answers
275 views

Large signal model analysis of npn BJT

I have the following circuit and I am trying to find VB, VE, and VC, and consequently IB & IC. The "hints" I am given are (1) to assume that vs has a DC value of 0V, (2) to use the large-...
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1 answer
67 views

Why do linear time varying system exhibit frequency conversion

I am trying to understand the theory behind spectreRF simulations. Specifically, PSS (periodic steady state) and PAC (periodic AC) The following concept keeps getting mentioned "After a PSS ...
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NEPLAN Load Flow Analysis with 1-day measurement

currently I am working on a project to identify energy loses in an electrical network. I am using NEPLAN 10, and already build a small system and implemented measurements. As soon as start the ...
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1 answer
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Analyzing effects of sixth order transfer function

This question is in relation to this question asked before (Settling time of sixth order denominator transfer function), but formulated in greater details. So I have a transfer function which looks as ...
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Analysis of BJT RC Phase Shift Oscillator

I have designed an RC phase shift oscillator and it works in LT spice but i want to know if the analysis i have did on this circuit is correct or not. I want to calculate the "gain" as well ...
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2 answers
74 views

Please help me perform DC analysis of the attached circuit and derive equation for VB (Q1)

I am designing a differential pair with single supply source (Vcc), and I am very particular about not using split supply. I am using discrete current source for setting the tail current, and biasing ...
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2 answers
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Rectified Voltage doesn't seem possible

This is my first question on this forum. I recently bought a used guitar amplifier and have the schematic. It's been almost 30 years since I worked in electronics but I thought maybe I could handle ...
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0 answers
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How to assess worst case runtime and correctness of an assembly implementation?

Set off by a question on CodeReview, I revisited "8-bit AVR unsigned division". Trying much the same as for below 8 bit/8 bit → Q, R implementation, I found assessment of cycle counts of an &...
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1 answer
162 views

Homework Help with Node Voltage

Hello, I just need a little guidance on if I am analyzing this circuit correctly using Node Voltage. Mesh and Thevenin Theorem resulted in Vy= 36V If i leave the ground where it is, the node after ...
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62 views

Communication protocol analysis via microcontroller board

I have an idea for my master's thesis. I want to make a communication protocol analyzer and monitor the data on a PC via software I coded. For the first stage, I need a kind of data acquisition system ...
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3 answers
173 views

how to interpret results from circuit sensitivity analysis

If you do a search on circuit sensitivity, you come across a presentation from Ti that discusses it, Circuit Sensitivity. In it, for example, they solve for the Q of a filter, and perform the ...
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Here how can we find steady state error?

Here in the plot shown in attached photo, how can we find steady state error because both blue and orange waves have different amount of error at different time
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1 answer
92 views

RC Circuit Analysis Direction Changes Formula

In my Circuit Theory lesson, we were studying RC circuits and there was a question which I tried to make before our senior but I accidentally came up with a different answer due to choosing current ...
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Zero Volt-Seconds Assumption in SMPS

What is the logic behind using the “zero volt-seconds” assumption for the analysis of converters and What are the limitations of analysis based on this assumption?
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1 answer
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no output error in hspice

I have this code for hspice simulation ...
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6 votes
7 answers
2k views

Why is power of a signal equal to square of that signal?

Is there any logic as to why the power of a signal \$\mathrm{x(t)}\$ is taken as \$\mathrm{x^2(t)}\$? I searched everywhere and there's no clue. My professor told: "It's a standard result so shut ...
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1 answer
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How to properly analyse this simple circuit?

I often get awfully confused when presented with circuits like this, and can spend around 20 mins looking at it trying to figure out exactly whats happening. So the way i find the voltage across 100M ...
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0 votes
2 answers
59 views

Weird looking last bit in a CAN message

I did my first CAN bus design on a prototype PCB. Now I would like to verify if the CAN transceiver is working OK. So I connect a PC-CAN-USB debugger and my scope on the CAN_HIGH and CAN_LOW signal ...
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3 votes
2 answers
335 views

Free/Open Source alternative to TekScope Anywhere?

I'm trying to analyze a signal I got out of a scope on my PC and a program like TekScope Anywhere looks like it will do what I'm after. How can I get plots and data of the scope?
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1 vote
2 answers
89 views

Scratched Transistor

I have an transistor that is used in mist maker circuit, but it's scratched for not understanding its model or numbers. how can I found out what type is this transistor?
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1 vote
1 answer
100 views

zero-sequence circuit of the three phase transformer question

Although I have tried a lot, I cannot draw the zero sequence circuit. Can you help me? this is my try.I could only come to some
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2 answers
211 views

feedback BJT ac analysis [closed]

I'm having trouble with a BJT question. How can we do ac analysis of this circuit? My attempted solution is this:
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0 votes
0 answers
209 views

How to use the print step option in LTspice XVII?

I'm aware of the print_step option for transient analysis, but I can't seem to get it to work. I'm using LTspice XVII for windows 10 to simulate a DC DC converter for about 3s (It is necessary to do ...
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0 votes
0 answers
556 views

LTspice - Extracting magnitude of signal from AC analysis using .meas and the phase

I want to be able to produce a measure function such that the output of that function would give me the magnitude of a signal when its phase is -360deg. I tried using .meas AC name FIND mag(V(out)) ...
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BJT conceptual doubt

I was given this problem in a problem set. I want to ask what will the voltage at Base when \$ \beta \rightarrow \infty\$. My answer to the problem - When \$ \beta \rightarrow \infty\$ then width of ...
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4 votes
3 answers
227 views

Transistor analysis, how can I find the currents?

I am struggling with the currents and their directions. Here you can see the simple circuit part. Since Vth(EBJ)= 0.7, Vth(CBJ)= 0.7 I could calculate the VCE by V(CBJ)-V(EBJ)= Vc-Vb - (Ve-Vb) = ...
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1 vote
0 answers
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1000V MELF Diode Intermittent Failure. Diode shows degrading reverse voltage characteristics

Hello to the electronics community in this forum. I am currently facing a MELF diode intermittent failures. These diodes failed when the final assembly (potted) is tested in a functional test after ...
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-1 votes
3 answers
228 views

Please explain the purpose of the marked resistors and diode in this transistor relay driver circuit

Please explain what the circled components are for. What is the difference between the \$V_{cc}\$ and \$V_{in}\$, can they be the same?
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DC analysis of P-type MOSFET circuit

For the following circuit I am trying to calculate the DC drain current \$I_{DQ}\$ I know firstly that while doing a DC analysis the capacitors act as open circuits. This means that there will be ...
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3 votes
4 answers
147 views

Equicalent circuit - RC // RC

I am doing a filter analysis of a simple network filter, requiring drawing some equivalent circuit to simplify the expression and analysis of the transfer function. The issue I've got is regarding a ...
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0 votes
3 answers
2k views

is it possible to make asynchronous down counter modulo 6 with 3 JK flip-flop?

in last week lab classes with my lecturer, we were asked to make an asynchoronous down counter mod 6 using jk flip-flop, but no one could make it until the end of the class. all of us has the same ...
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0 votes
2 answers
191 views

AC circuit analysis with a transmission line involved

I'm trying to perform an AC analysis of a circuit that contains a piece of coax cable. The input voltage 'Vs' is a swept frequency (1MHz-150MHz) voltage source with constant amplitude. What I'm ...
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