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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How does product of two terms represented in control system block diagram?

How does the product of two terms represented in the control system block diagram? Let's say I want the output as a product of two states. i.e. y = x1*x2 how would I represent it in a block diagram?
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38 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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7 views

RCS data analysis. [CADFEKO]

I have simulated radar cross-section (RCS) data of a small drone using CADFEKO. I'm using MATLAB to do the data analysis part. I have tried the histograms, heatmaps, error bars comparisons but still ...
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2answers
70 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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25 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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24 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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35 views

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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3answers
134 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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32 views

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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13 views

Transient voltage through an inductor in a step RL circuit

The current through the inductor in the above circuit is 2 A at t = 0- when it is short-circuited, since u(-t) = 1 for t < 0 and 0 for t > 0. At t = ∞ the current is 0 A, so I(t) should equal 2e^-...
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158 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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4answers
127 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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1answer
56 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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2answers
42 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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3answers
77 views

Analysis of Preamp circuit

I found this schematic (in Spanish) and annotated it with my interpretation. Anyone care to correct me or add?
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1answer
56 views

superposition analysis technique

Below I am presented with the following circuit and asked to solve for the current through R1: EDIT: in the diagram below I made a mistake, V2 is shown as 8V, it is supposed to be 40 V. I apply a ...
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77 views

How to parse this protocol with an arduino?

I'm analyzing a signal from my building's intercom system to my tenant station. Intercom has two wires, +24V/0.27ma, and ground. Every 10 seconds, the system sends a "heartbeat" signal to the tenant ...
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29 views

Formally determining the minimum number of poles needed to realize some suggested switching arrangement

Many times, when designing passive switching circuits, one has the following engineering problem: We know we want to have some number of switches, each with some number of throws. For each possible ...
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1answer
54 views

Question about the MOSFET saturation condition

I'm solving a problem in my textbook and I got stuck, and I have the solution manual of the textbook, so I went to see through the solution and I found a thing that I suspect to be wrong, due to my ...
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2answers
408 views

SDA pin on I2C lines seems weird

I am trying to analyze the I2C commands sent by a PC software to R3910 DSP chip The software uses a programming box (provided by the same company that manufactures the R3910 chip) to communicate ...
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2answers
99 views

Capacitor Discharging Time under a Sinusoidal Voltage Source

I just can't find the correct solution to the following, pretty basic problem: A capacitor \$C\$ is continuously discharged by a resistor \$R\$. This is easily described by an exponential decay (\$\...
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2answers
69 views

Confused about equivalent resistance

I know resistors in series have the same current, and resistors in parallel have the same voltage drop, but in practice, I can't get the equivalent resistance right. Wondering if anyone has tips/...
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35 views

Using current divider to see how much current goes inside the plane when lightning strike

I am working on a project that requires me to understand how engineers do current analysis. The aircraft has a metallic body which provides a path for lightning when it strikes but what if there is an ...
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1answer
65 views

Using mesh analysis find all current

Using mesh analysis find all the current in the given circuit Schematic redrawed:
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2answers
445 views

White and Pink Noise Generator Circuit - Cryptic AC Analysis

The “Electronic Devices and Circuit Theory” book (by Boylestad, Nashelsky) gives a brief description of a random noise generator circuit at the end of “BJT AC Analysis” chapter. (Btw, exactly the same ...
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1answer
63 views

DQ frame in foc of induction motor

How to find the orientation of DQ axis of rotor and stator in induction motor using iq and Id currents? Particularly in foc of im, I have measurement of stator ia, ib, ic and rotor omega. However, ...
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1answer
59 views

Help to determinate stability of Opamp Circuit

I have background in software but this time I need to build a circuit for scaling a signal from 15 to -15 VDC. At college I took some subjects on Electrical topics so I have read to remember, after ...
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1answer
77 views

Finding a Fourier series of a Burst Fired sine wave having consecutive 2 cycles on & 2 cycles off?

I have been trying to find the solution of the following problem but with no luck. I have a system that generates a waveform of sinusoidal type with the only difference being that this wave has 2 ...
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2answers
93 views

Electrical schematic symbol help(looks like an or gate)

I'm wondering if that little dot represents anything?
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1answer
46 views

How to calculate reactance from an impedance analyzer circuit?

Background I have an impedance analyzer that uses the below circuit: Source One can measure impedance of the device under test (DUT) by using the following formulas: ...
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2answers
105 views

Mathematical therefore symbol (∴) needed for documenting circuit analysis calculations [closed]

When doing circuit analysis calculations I use the mathematical therefore symbol in my calculations and need to document my iterations to support my analysis. There is no ASCII code for the "therefore"...
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1answer
144 views

DC Analysis of Transistor Circuits - Double vertical line symbol

I have stumbled twice across this symbol || being used in the analysis of transistor circuits. An example can be seen at this address: http://www....
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52 views

Mesh analysis to find Vx

simulate this circuit – Schematic created using CircuitLab I'm trying to solve the following circuit using mesh analysis. Here is my equation. The goal is to find the value for Vx. **Vx is the ...
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2answers
73 views

Op-Amp analysis without using op-amp gain

I have a question concerning this op-amp problem for which I need to find an expression for \$v_{out}(t)\$, where \$V_B\$ has a constant value: simulate this circuit – Schematic created using ...
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1answer
92 views

Node analysis with voltage source, How to solve with matlab?

So i have this matlab homework where i need to find voltage on Y2 and Y3 using node analysis. Arrows indicate direction of current flow in branches. simulate this circuit – Schematic created ...
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2answers
916 views

Voltage transfer curve; MOSFET

How to classify the voltage transfer curve into various regions, as shown, (In the image, \$V_0\$ refers to \$V_{DS}\$ and \$V_i\$ refers to \$V_{GS}\$) Since, the various regions of operations are ...
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378 views

Why the opposite of the passive sign convention is not the active sign convention?

Studying the fundamentals of circuit theory, I was reading the Wikipedia article on the Passive Sign Convention and found out about the Active Sign Convention (ASC). After searching many introductory ...
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2answers
118 views

Resistive circuit analysis with dependent current and voltage source

The question in a study book says to find the current through R2. I have very little experience dealing with dependent current and voltage sources, so I get thrown off when performing loop current (...
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1answer
81 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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33 views

Calculating low-pass filter prototype specifications

So I'm just wondering what I need to figure out before I can actually calculate anything here, (only considering the a-part now)? I understand that 2.5 GHz should be 3dB and 3.75 GHz should have 25 dB ...
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2answers
71 views

Mesh current analysis voltage and current source

Can somebody please point me in the right direction here Im trying to create two equations to solve for IA(left hand loop) and IB(right hand loop) I need two equations consisting of IA and IB to ...
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2answers
140 views

Worst Case Analysis of the LED circuit - Reg

I need to perform the Worst case analysis of the LED circuit attached. The value of the resistor has already been chosen and I am doing the calculations for min, typ and max current. Please bear with ...
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1answer
139 views

PSpice - simulation worst case - delay on AND gate?

I have a question to someone who is familiar with PSpice analysis. I have a simple circuit as below and everything works good with "typical" simulation - dstm1 gives positive impulses continously and ...
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2answers
239 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
80 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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1answer
391 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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3answers
290 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
52 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
120 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 ...

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