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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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2answers
88 views

How to calculate the voltage gain in this picture?

simulate this circuit – Schematic created using CircuitLab I know that by using \$A_v=-G_mR_{out}\$, and \$G_m=\frac{I_{out}}{V_{in}}\$, we can get the voltage gain of this circuit. After the ...
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1answer
68 views

Source Transformation

Ok, I have modified my question again about the same circuit seen below: I have to simplify the circuit using source transformation and then find the current ix. I have attached my attempted ...
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0answers
49 views

How is Falstad online circuit simulator helpful, and is there a simple PC application similar to it? [duplicate]

I found this Falstad online simulator online and felt that it is interesting. What do you recommend about it for beginners like me? Is it a beneficial tool to use? Is there a simple PC application ...
0
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1answer
135 views

Battery Charge and Discharge Time

I am doing a case study on battery back up of a wind system with the following specification: System size: 10 kW which runs continuously for 5 hours per day. Battery Calculations: Battery type: ...
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2answers
64 views

Order of precedence for parallel operator

In electrical engineering the parallel operator || gives half the harmonic mean of two values. E.g.: \$R_1 \parallel R_2 \equiv \frac{1}{1/R_1+1/R_2} \$ But how should you compute \$kR_1 \...
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1answer
47 views

Current change through Series resistors

My question surrounds a simple scenario. I have a 12V DC power source connected to 2.2kΩ/10kΩ/22kΩ resistors in series. For an assignment, I have theoretically calculated Voltage drops across all ...
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5answers
105 views

What kind of tool is used to record a voltage over time to a PC file like a waveform?

I don't have any training but am doing some hobby electronics. I would like to record a change in voltage over time, sampled at around 100+ kHz. Ideally, I'd like to record around 20-30 min of two ...
2
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1answer
70 views

Power amplifier simulation and real time experiment mismatch problem

Thanks in advance to anyone who will take the time to read my first post here. At present, I am doing a simulation of a power amplifier in LTSPice. The schematic and relevant files are uploaded in a ...
0
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1answer
44 views

Differential amplifier and large signal analysis

Let's consider this circuit: Razavi makes the large signal analysis in the ideal case, that is with an ideal current generator. He shows that Ic1, Ic2, Vout1, Vout2 and (Vout1 - Vout2) are function ...
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1answer
39 views

DDRx timing analysis

I have a question regarding timing analysis for DDR3 and DDR4 signals. How do we do timing analysis to see if all setup and hold requirements are fulfilled correctly, considering they have write ...
0
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1answer
99 views

Can we use nodal analysis without any information about the current

I learned today Mesh Analysis and Nodal Analysis principe (with KVL and KCL) for a computer project and I am not certain about one thing. Can we use nodal analysis with only the voltage of the source ...
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3answers
58 views

meaning of having harmonic on special signal

my question maybe seems very simple but, I'm not familiar with the answer of that; what is the meaning of harmonic of the signal exactly? I know the harmonics of the signal are signals whoes ...
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0answers
38 views

What is these factor multiplying the current of the copper wires_?

I was reading some solved problems about transformers but I don’t understand how was calculated the losses in the copper. - Enunciate: A one phase, 10kVA, 2400/240, 60Hz distribution transformer has ...
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1answer
56 views

Using my sensor values, what are relevant data analysis techniques?

I am currently trying to devise a system using gyroscope+accelerometers placed in on a hat/cap in certain areas of the head (Front-left, Front-right, Centre, Back-left, Back-right). I want to create a ...
0
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1answer
32 views

Small signal analysis of 2nmos

To introduce myself I am a first year EE student and an exam on AC circuits is comming up. Whilst practising I noticed one question I couldn't solve. No way I tried managed to get me the answer (which ...
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0answers
76 views

Big Muff V7 Russian design problems?

I am trying to build this version of the Big Muff V7 on Eagle but can't seem to understand the schematic quite well. As you can seen on the image , there are couple 3 switches, sw 1a , sw 1b, and sw ...
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2answers
81 views

Op Amp Summing Point Problem (Ideal)

I have a quick question on this example problem on (ideal) OpAmp analysis. I understand the basic cases of negative and positive feedback, and how there is a virtual short between the input pins of ...
0
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1answer
118 views

Jacob Shekel's method for ideal transformer

I would like to ask some questions relating to the thesis "Analysis of Linear Network" by Jacob Shekel. From chaper III - "The Network", section 3.6 - Network Transformations, the author explains ...
0
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1answer
251 views

IIP2 Second Order Intercept Rule of Thumb

I'm faced with the problem of explaining the harmonic production in a system where the second order intercept points of the cascaded components are unknown. As a way to bolster my explanation, I would ...
4
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2answers
538 views

Problems with DC analysis of a PMOS circuit

I'm beginning with electronics and I've picked up the book from Donald. A. Neamen - Microelectronics. I'm stuck at a simple example of DC analysis for this PMOS circuit. simulate this circuit – ...
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0answers
230 views

BJT common emitter amplifier analysis question

I need help for analysing a common emitter amplifier. Basically it wasn't explained too well in class and I can't seem to find any information on the internet which can help give me the answer but for ...
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2answers
161 views

Are there any cases that Source Transformation method can not be applied?

When I tried to use Source Transformation method on the 12 V voltage source the problem gave me a wrong answer. If I transformed the 2 A current source it works just fine. My question here, Is there ...
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1answer
85 views

Thevenin Equivalent of this mesh

simulate this circuit – Schematic created using CircuitLab I have to calculate the resistancy value Rx, when the equivalent thevenin voltage is applied and generates a current of 2 Amperes on ...
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2answers
39 views

LED circuit analysis with PHY DP83822HF

I need help with the circuit analysis, specifically, if the LED frwd voltage range is 1.6V-2.1V and the power rail is 1.8V connecting to a 1.8V I/O, how can I figure out what amount of current (...
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2answers
238 views

BJT with Zener diode

I got the picture from my prof's notes, and I don't quite understand why there can be two different currents at the given node. If there are only two currents shouldn't the currents' values be the ...
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1answer
91 views

Power amplifier input source current path

Can anyone draw (or write in text) the small-signal path from signal source XFG1 at input of Q1 base to amplifier load for positive and negative input signal swing?
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1answer
47 views

Half of differential tage voltage gain

I can't understand why is 2Rpi in equation 375/376. It looks like the current ib1 goes through Rpi of first stage and through Rpi of second stage but it must go through first Rpi to ground and back to ...
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1answer
48 views

Form differential equation pair from discrete time system block diagram

I have a discrete time system block diagram. And my question is what is the output y(k) I managed to get what is V(k) $$V(k)=\frac{1}{2}*V(k-1) +U(k) $$ But now i can't form y(k) because ...
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0answers
66 views

Mesh Analysis of Following Circuit

I have a proposed circuit as demonstrated in the photo below. Included are full measurements for resistors, LED strings (a string of 10 LEDs in series represented by a diode), a current source, mesh ...
1
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1answer
622 views

using mesh analysis with capacitors and impedances

My circuit analysis skills are a bit rusty; since, I been coding for a long time now. I'm analyzing a switching circuit's on and off cycle. I am solving for Vc2 in terms of D and ( 1 - D). here is ...
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1answer
90 views

Health index / performance curve of a motor

I am collecting daily data of motors that consists of vibration in three direction x,y,z , RPM, Temperature, kVAh, kWh, kVArh, average voltage (LL), average voltage (LN), average PF, average current ...
0
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1answer
39 views

Nodal Analysis #2 - Where is my mistake?

I am given a problem with its shallow solution (i.e. not all steps/formulas shown). When I tackled the problem (below), my answer didn't match the apparently correct solution. Where is my mistake? The ...
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0answers
45 views

Nodal Analysis #1 - Where is my mistake?

I am given a problem with its shallow solution (i.e. not all steps/formulas shown). When I tackled the problem (below), my answer didn't match the apparently correct solution. Where is my mistake? The ...
0
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1answer
160 views

How can we do KVL like this

[edited] I'm DC analysing a cascode configuration of BJT and my teacher do the KVL of the circuit like the Black arrow in the picture. But I don't understand why the KVL straight from the node to the ...
1
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2answers
107 views

Help with analysing OP AMP circuit

This op amp circuit is used to offset stepped-down AC voltage by 2.5V(approx), so that the RMS of the voltage can be calculated. I can not change the configuration of the circuit, so that is ruled out....
34
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2answers
2k views

Cross section of ceramic capacitors

I am trying to make a fault analysis of a bunch of ceramic capacitors. Short description of the application: 10 220 µF ceramic capacitors 1210 package are placed in parallel with a 3.6 V battery. A ...
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1answer
278 views

Nodal analysis - Super node needed?

If using the nodal analysis for a certain circuit one usually chooses a node as reference node such that one can reach as many other nodes as possible. Unfortunately 99% of the literature I found on ...
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2answers
232 views

Can over-excited synchronus motor operate on lagging power factor?

All of the Electric Machines literature I'm using states that over-excited (back emf E> supply voltage V) synchronus motor will operate on leading power factor (one of them states that it may also ...
0
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1answer
69 views

Having some questions about converting a PWM signal to analogue signal

Hello i am using a Lowpass filter to effectively "create in a sense" a analogue signal. The problem im having is the example that i was shown fourth diagram has a smooth wave essentially. However for ...
1
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1answer
76 views

Wanting to know if these formulas are correct for this very basic circuit analysis [duplicate]

Hello for the following diagram below, i was just wondering if these formulas are correct to finding what they state (i.e. Vout and V2). For V2 is R3 and C2 in parallel with C2?
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1answer
48 views

Nodal Analysis of Circuit

Given this circuit, we want to find V(t) or the equivalent D node circled. I set up the nodal analysis equations in the phasor domain as follows, with a super node at the dependent source. However,...
0
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2answers
298 views

Power supply selection circuit review

I just wanted to ask if this power switching circuit is well done. I used an opamp and a MOSFET to select between two different power supplies connected at once. This circuit would select the highest ...
3
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2answers
496 views

What is this Op-Amp Configuration doing?

This Op-Amp Arrangement is part of an analog signal processing for a knock sensor of a combustion engine and I'm very curious about what this part actually does, as my google research didn't help me ...
1
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1answer
64 views

Street Lighting Circuit Analysis

1- How does a typical street lighting circuit look like? (for 230V/50Hz, with details) 2- Without having the network plans or knowing anything about the topology of the circuit, is it possible to map ...
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3answers
2k views

Solving a BJT circuit for transistor voltages/currents

The problem is if \$\beta= 100, V_{cc} = 9v, R_1 = 16k, R_2 = 4k, R_3 =10k, R_4 = 1k,\$ solve for \$ I_b, I_c, I_e, V_b, _c, \$ and \$ V_e.\$ I tried to write equations for each loop: \$V_{cc} - ...
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3answers
100 views

Simple circuit question: nodal analysis

"simple circuit" I'm trying to find vout as a function of v1,r,c, and v2, but I'm i'm kind of stuck on what to do. I'm pretty sure you need to do nodal analysis, but I've never really encountered a ...
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0answers
153 views

Normalize frequency responce in LTspice

I'm using the Monte Carlo method in LTspice to check the sensitivity of the frequency response of a filter due to component tolerances. Running the AC analysis, I get a family of tracks that ...
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4answers
859 views

Find impossible circuit resistance

What is the resistance Rx, in order to have Vo/Vs=1/2 Hi, my teacher asked us to solve this question, keep In mind that i'm not asking for you to do my homework, I think is just a impossible question,...
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1answer
120 views

KCL and KVL with Laplace incorrect result

For t > 0 find v0(t) Using nodal analysis I was found v1 and v2, take difference and find correct result But I can’t make same with direct KCL, KVL approach May anyone help with that?
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2answers
584 views

Fourier transform to understand filtering on PWM

Is it correct to analyse the impact of a low-pass by regarding at the Fourier transform of a PWM signal, even if this one is generated with a H-Bridge ? And deduce that the higher frequencies forming ...