# 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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45 views

### Calculating the poles of a Circuit

I have been reading Behzad Rahzavi's Analog Design book to prepare for interviews and have come across a discussion on calculating poles that confuses me. In the following example 6.15 the book ...
51 views

### Using Microchip Technology MCP39F521 (I²C Power Monitor) with 240V

In the sample schematic Microchip Technology supplies in the data sheet for their MCP39F521 shown below, it appears that V1- is grounded. (V1- and V1+ are input pins for determining voltage.) Does ...
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1 vote
109 views

### Transient circuit analysis with additional source

The circuit in the image below is what I get when I open the switch of a larger circuit which I have already analysed. Therefore, I know the initial condition. simulate this circuit – Schematic ...
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137 views

### How to do an electrical network analysis?

I'm preparing for an upcoming exam in electrical engineering and came across this task. My question is: Which method is best for this? I think the superposition principle would be very complex, right? ...
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103 views

### What is the point of analysis and biasing calculations when real world performance is going to be much lower in analog circuits? [closed]

I am making a 3-stage audio amplifier as a course project. The first stage is a differential amplifier, the second stage is a common-emitter amplifier, following that there is a passive filter and ...
348 views

### In the circuit of Fig. 3.49, current i1 is: (a) 4 A (b) 3 A (c) 2 A (d) 1 A

I am starting this subject i need help for this question. If anyone could solve it please tell me. I don't understand what to do with the nodal analysis. I am thinking to add the 2ohm and 3 ohm ...
159 views

### Resistive network with two voltage sources

Update: (I updated the description/Question for clarity) I am currently stuck trying to solve a seemingly simple resistive network. The voltages U1 and U2, aswell as Rr are known. The unknown ...
86 views

### Tolerance Stack Up Distribution

Suppose I've got a 2V source with 2% accuracy that I want to divide down to 1V using 5% resistors. One can easily see with Monte Carlo analysis that the worst case output voltage deviation is 7% I'd ...
49 views

### How do I figure out what these ack signals mean?

I am trying to get the data from a rangefinder and an HT1621 LCD driver. I have set up a logic analyzer that uses an I2C analyzer. I am receiving all of these signals but frankly don't know where to ...
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153 views

### Calculate inductance of a coil with an iron core inside

I want to calculate inductance of a coil with an iron core inside. The iron core is not vertically centered, but it is still aligned along the axis of the coil. I know that FEMM softwares and ...
75 views

### What is a color bars vector diagram?

I'm reading the datasheet of the "AT7456E". This component is an OSD (so-called "on screen display") used on the flight controller of my drone project. In the datasheet there was ...
58 views

### LTSPICE AC analysis problem

AC analysis dont work for second circuit. If i delete some transistors from 1-st circuit, it starts to work for second circuit.
60 views

### Stuck during designing a PI Controller

I'm trying to design a PI Controller on the basis of this paper: "Design of robust PI control systems based on sensitivity analysis and genetic algorithms." by Jau-Woei Perng • Shan-Chang ...
89 views

### Can someone explain what's a "Clearing Event"?

I'm working with a friend where he's trying to simulate a clearing event for 10uF capacitor. As of now, he's using a 10uF capacitor, a power supply running 48 volts, and a 40kohm 50Watt resistor. He ...
61 views

### Complex power and another from of complex power

I am a little confused with something, when we have complex power in a form S = U * I. There is also version of S = (1/2) * U * I. So I would like to know what is the difference between those two ...
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191 views

### Need help to find Thevenin resistance and Thevenin voltage

Here is the question I am trying to solve(there are 2 things I need to find. These are Vth and Rth): Here is my attempt: ( please check Vth if it is true ) I couldn't find Thevenin resistance at all ...
1 vote
148 views

### Understanding Crystal Oscillator with 3 BJTs

I came across this oscillator circuit. I can't figure out how it works. Ok, there is a differential pair Q1, Q3 with a tail resistor R4... Everything else is out of my comprehension (it doesn't ...
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1 vote
124 views

### Help to understand how work this halogen lamp power supply

I ask for your help for the following: Understanding how this power supply works (how the 18kHz are generated). The role of 100Hz. How thermal and overload protection works. How those protection are ...
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1 vote
126 views

### What could be the reason for an overheating Arduino? [using TWO different power supplies]

I'm tinkering a bit with a new printed circuit board I made and I already lost two boards (one ESP32 and one Arduino WiFi 1010) and I'm stumped because I don't even know where to start to look for a ...
• 1,019
683 views

### What is the purpose of the capacitor in this SMPS circuit?

Can anyone tell me the purpose of the 2n2 100V capacitor and its function in the circuit? Image source: danyk.cz - 12V 5A switched power supply
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1 vote
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### Synchronous buck converter designing issue

what I'm recently occupied with is trying to create a model and later build a synchronous buck converter. I've been doing some troubleshooting to try to resolve my issue, but honestly I just got stuck....
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110 views

### DC Motor Difference Equation Digital Control System

This shows a DC motor drive with the voltage input. And the discrete-time model is like this The difference equation should be something like this: Where the C_1T is the inverse laplace transform of ...
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121 views

### How to calculate Bit Error Rate of an electronic equipment with several parts?

I am currently studying integrity of data into electronic systems facing Single Event Effects. I am focusing on data integrity inside an electronic equipment. I've been through a lot of papers ...
75 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
61 views

### How can I DC analyze these values in netlist simulation

For my lab report I have to DC analyze a circuit for these specific VDD values. Is there any way to get simulation output for just these values? Because when I write .DC VDD 0.2V 10V 0.2V or .DC VDD 0....
97 views

### How does this circuit work? How can I analyse this circuit? 10 by 10 reaction game circuit

I built a project with the help of a breadboard diagram. Now I want to understand what this circuit does. How does this circuit work? I am looking for an analysis of this circuit diagram.
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### Circuit Analysis: R3(Missing), Voltage(Missing) [closed]

This is a very simple circuit but I cannot solve it as I'm very slow in circuit analysis. Hence, I'd like to ask if someone can show me how to solve this one.
165 views

### Best way to transfer indication signal from one STM32 to another STM32 [closed]

This is the system: I need a simple way to pass a signal from the upper controller to the lower controller. The whole purpose is to read an analog voltage, sample it, make statistics, and transfer to ...
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1 vote
186 views

### Question about transient analysis in LTspice

Can anyone explain the function of these three options in transient analysis? Stop simulating if steady state is detected Step the load current source Skip initial operating point solution I was ...
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115 views

### Is it possible to ignore Nyquist-Shannon theorem?

I have a case in which I have to find a frequency of wavering object with camera (some kind of visual odometry). There is a limitation: frequency of a filming camera (fps) should be at least twice ...
356 views

### How to verify noise modelling in fully differential op-amp Spice models?

Texas Instruments explains in one of their videos how to verify the noise model of op-amps in Tina-TI. T For this, the op-amp is wired in a buffer configuration. A voltmeter (voltage pin) is placed at ...
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305 views

### Series/Parallel Resistor Association

My question is very direct. I understand the definitions and formulas involved in the association of resistors in both series and parallel, but when solving the circuit below, I don't quite understand ...
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2k views

### Will this mains disconnect circuit work?

The purpose of this circuit is to disconnect a home wiring from the grid when there is a power failure without having the power contactor coil working 24/7. Where I live, when the power is restored ...
1 vote
171 views

### Can you explain how this NDT ultrasonic transmitter circuit works?

I am simulating the circuit shown below. I do not understand how this works and how this will help in generating high voltage pulses for NDT ultrasonic testing.
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580 views

### 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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144 views

### 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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933 views

### 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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352 views

### 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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476 views

### 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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351 views

### 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 ...
1k 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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1 vote
114 views

### 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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189 views

### 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, ...
1k 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 ...
194 views

### 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; ...
1k 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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### 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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1 vote
3k views

### Difference between KVL and mesh analysis

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