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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5k views

How to analyze this diode circuit?

I am trying to analyze this simple diode circuit by hand, but I can't seem to get too far. simulate this circuit – Schematic created using CircuitLab Using circuit lab, it is evident that ...
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3answers
4k views

Simulation for a transmission loop using PowerWorld

I am now learning how to use PowerWorld Simulator. However, I faced some problems when I tried to enter the data given in the paper. I want to simulate the following transmission loop: First things ...
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4answers
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How to get fundamental frequency of a signal using autocorrelation?

I am trying to get the fundamental frequency of a signal that only has a single pitch. I coded out the autocorrelation function using FFT and already got the autocorrelation result. Unfortunately, I ...
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1answer
342 views

What is the output for this sequential circuit? [closed]

For this sequential circuit are the outputs "next state function" for q1 and q0? $$D1 = (Q1)Y' + (Q0)Y' $$ $$J0 = Y'(Q1)' + Y((Q1)'+(Q0)')$$ $$K0 = Y$$ $$Q1 = D1$$ $$Q0 = (J0)(Q0)'+(K0)'(Q0)$$
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2answers
136 views

Does nodal analysis work with alternating currents if every step is treated like DC?

I have a question that is difficult for me to describe. I want to know if I will get accurate readings of an AC circuit by nodal analysis if I treat each significant voltage change as a DC circuit. ...
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1answer
41 views

High voltage peaks when using mxo45hs-3c-1m0000

I am using an mxo45hs-3c-1m0000 quartz in order to produce a 0-5V square signal (1MHz). On the oscilloscope, the signal I get is a square signal, but there are important sine waves in the plateau. I ...
2
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2answers
3k views

Analysis linear ladder circuit

I'm trying to answer following question: In the ladder circuit in figure 3, find the current, I, if \$V_s = 7V\$. Use the fact that the circuit is linear. This can be done by assuming that \$I=...
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3answers
449 views

Parallel resistor not affecting rest of the circuit

I have been asked the following question: The resistance, r, is not known in fig(1a), why does its value not affect potential at b? By Thévenin's theorem, any arbitrary voltage source can be ...
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1answer
348 views

R-L Transients Storage Phase: “Inductors” Help?

The below expression is for finding the induced voltage across the coil (inductor) at a certain Time Interval. Furthermore, the additional expressions are to find the induced voltage at 1T and 5T. I ...
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3answers
2k views

Nodal analysis for current controlled current source

Okay here I go. I just started learning nodal analysis technique but I feel its difficult in solving the circuits consisting of dependent current and voltage sources. Im unable to solve this circuit. ...
3
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2answers
6k views

How to solve a transient circuit

Given this circuit considering that before the switch closes the network is in a steady state. What steps should one follow to trace \$V_{L1}\$ before and after the closing of the circuit ? As far ...
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2answers
230 views

Under what circumstances can impedances be simplified to simple resistances?

Consider the following circuit: This is a simple first-order low-pass RC filter. The cutoff frequency is: \$ f_c = \dfrac{1}{2 \pi (1k\Omega) (1\mu F)} \approx 159 Hz \$ The reactance of C1 at \$...
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2answers
2k views

Techniques for analyzing Comparator circuits?

I'm looking for some general guidelines/equations I can use to analyze circuits which use comparators. In particular, I'm interested in hysteresis. For example, take the following open collector/...
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1answer
3k views

alternative fix to: How can I calculate a Joule Thief

This is based on the original question: "How can I calculate a Joule Thief. How Can I calculate a Joule Thief. Since the gain of common emitter voltage amplifier and it will depend widely on the ...
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2answers
6k views

Find the DC component of a Full wave rectifier (DC Power supply)

I was asked: Find the DC component of ---|Full Wave rect| -- Vr(t) ---|Filter| -- Vo(t) $$ V_r(t), V_{dc} = ?$$ Where $$ V_r(t) = |V_m sin(\omega_o t)|$$ I know that the DC component of #$V_r(t)#...
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1answer
820 views

Z-parameters. Is Z12*Z21 always greater or equal zero if a circuit has only resistors? [duplicate]

Possible Duplicate: Is equivalent resistance always lower if we add a resistor to a passive electronic circuit? Since my last question was probably badly formed and misunderstood this is a new ...
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1answer
2k views

Thevenin equivalent with dependent and independent generators

Considering the following circuit When calculating the Thevenin equivalent, I calculate the Thevenin resistance value Rth. Why do I have to consider the controlled voltage generator? And ...
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2answers
334 views

Voltage divider ambiguity

considering the following circuit : ...
2
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2answers
8k views

Z(in) for small signal analysis with BJT for unbypassed emitter and r0 in place

I have been studying the small signal analysis of BJT with re model with the emitter terminal not bypassed. I am able to derive those Zi, Zo,Av, Ai long as ro is assumed to be infinite. But I am ...
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1answer
1k views

Two Port parameters on an Op Amp

I am asked to find the h-harameters for this op amp: I found the gain to be 1.87*Vi (where Vi = the input source). However I don't know how to do two port parameters with op amps, we've only covered ...
2
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2answers
639 views

Nodal Analysis of an electrical circuit

I have several doubts about solving circuits. Can any circuit be solved using Nodal Analysis? If some circuit can be solved using Nodal Analysis, can it be solved using Mesh Analysis too? Why do we ...
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3answers
312 views

Integrating Signals

Yes that simple, Can someone explain what the main purpose is behind integrating an incoming signal? What advantages does this offer over lets say reading the voltage directly with an A/D? How does ...
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1answer
3k views

Solving PMOS Analysis Problem

I am trying to analyze a PMOS circuit, but cannot seem to set it up correctly. Here is the circuit: $$K_P=\frac{250 \mu A}{V^2}$$ where $$V_T = -1V$$ I have simulated the circuit with Pspice, but ...
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1answer
5k views

Circuit analysis - software?

Surely there is some software that lets you draw a simple circuit diagram (DC voltage source and resistors) and then tell you the voltage, current, resistance, and power on R1, R2, R3, etc as well as ...
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1answer
2k views

Need help designing a current controlled source in PSpice?

The image below shows an electrical network with 8 elements, a current controlled source, a bunch of resistors, one current source and a voltage source. Although I haven't labeled them, there are 5 ...
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2answers
701 views

Frequency response - finding transfer function

I have a this circuit: I am asked to find |H(\$\omega\$)| in its simplest form. I approached the problem by first recognizing that the first op am was a standard inverter. With that I basically ...
3
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1answer
232 views

equivalent load resistance

I have the following circuit I am having some trouble determining the relationships between Iac, Io and Iacpk. I'm not quite seeing how the final equation for Iac was determined, specifically ...
3
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2answers
922 views

Identifying an irreducible circuit?

How would you go about identifying an irreducible circuit? By irreducible, I mean combining resistors whether in series or in parallel to reduce the circuit.
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2answers
4k views

What is meant by relative voltage?

Suppose you have a circuit ,you are told that the voltage at point 2 relative to point 1 is -90V, the voltage across R2 is -30V and V0 is 200V. What is the meaning of voltage at 2 relative to 1? ...
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1answer
944 views

What's passive about the passive sign convetion?

I've heard and read about the passive sign convention, but don't really understand its meaning and importance in solving electric circuits. Is this because of conventional current which flows ...
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2answers
321 views

Block Diagrams with offset in control theory

I have an equation in the form $$y = mx+b$$. In block diagram form, I could draw this with a proportional gain block and a summer. I was wondering if there are some clever tricks where I can make ...
3
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2answers
531 views

Sniffing USB traffic at the hardware level

I've been looking to purchase a USB sniffer that will parse packets at the hardware level. I've used usbsnoopy and the like, but a filter driver solution is not my ...
2
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3answers
10k views

applying nodal inspection technique to supernodes with dependent sources

I was about to apply nodal analysis via inspection (to make it faster) to the above circuit, yet as we can see, it has a dependent source. So listing the equations for node(1 and 2) supernode a: $$...
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3answers
462 views

Proper assignations of current directions

What is the best way to know the proper direction of current? Lets say we have this circuit below: The correct directions are given below: What are your techniques to know which is the proper way? ...
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2answers
221 views

Intro Circuits Class Inductor question

This is a question from my intro circuits class that I can't figure out the answer to: Of course it's very simple, but I had a professor who was incomprehensible most of the time, and my textbook ...
2
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1answer
204 views

frequency modulation

I hope this is a pretty easy question for you guys. I know for frequency modulation (FM) for fundamental frequency you have the expansion $$output = J_0(\beta)V\cos(\omega t)\pm J_1(\beta)\cos((\...
3
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2answers
3k views

Calculating an R-RC circuit

This is not homework. I have this circuit, and I want to calculate V2. I know it is equal to V1 at t=0, and equal to \$V1 \cdot \frac{R2}{R1+R2}\$ at t=\$\infty\$, but I don't know how to calculate ...
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5answers
4k views

Predicting thermal equilibrium: what's wrong with my time constant?

I understand that this is arguably a peripheral electronics problem, but it seemed to fit here better than in physics. I've been doing some power electronics design work with large IGBTs mounted on ...
3
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1answer
2k views

How do I treat a PMOS compared to an NMOS in small-signal analysis?

What exhaustive list can I use to determine the differences between NMOS and PMOS devices when doing small-signal analysis? Equivalently, what are the fundamental differences between NMOS and PMOS ...
3
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2answers
1k views

Common gate amplifier with load connected to negative DC bias

What's the difference between the following two circuits? Note that the capacitors are DC blocking, and the FET is on. I understand that usually, the load is connected to ground. But what would ...
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2answers
127 views

Amplifier theoretical analysis problem

I have this problem in a book and I've did good through the entire problem until I had to calculate current gain. I've been stuck for the past 30 minutes. The formula I get is different from the one ...
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2answers
310 views

Source transformation of two current sources not in parallel

Is A B |‾‾| |‾‾| i1 ↑ R1 R2 ↓ i2 |__|__|__| D equivalent to: ...
2
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2answers
229 views

Where can I find projects that are more tutorial than “copy-paste”? Some thing that talks about the math and analysis of it as well.

So, I'm taking 6.002x which is basic circuit analysis of resistor networks, MOSFETs, capacitors, inductors, diodes, gates, amplifiers, etc. and while I enjoy this I'm not learning anything about ...
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1answer
6k views

Questions about Thevenin's Theorem

I am reading up on Thevenin's Theorem and this has prompted a few questions that I hope somebody will be able to answer. This is the tutorial I am reading. The circuit below is then given as an ...
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2answers
989 views

Negative voltage in Mesh Current Analysis

I am trying to learn about Mesh Current Analysis and have a question I was reading this explanation on the subject from electronics-tutorials.ws: http://www.electronics-tutorials.ws/dccircuits/dcp_5....
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2answers
8k views

NPN Transistor Analysis: How is collector current determined?

I'm trying to understand NPN transistors by reading the chapter on them in Razavi's "Fundamentals of Microelectronics", and it says that collector current (Ic) is a function of the base-emitter ...
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3answers
38k views

What's the difference between MOSFETs and BJTs (from a circuit analysis perspective)?

When analyzing circuits with transistors in them, when does it make a difference whether they are MOSFETs or BJTs?
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1answer
405 views

How do I deal with square, cubic, etc. zeros and poles when manually drawing a Bode Plot?

I'm manually drawing a straight-line Bode magnitude plot. Say, I have the following transfer function in standard form for a Bode plot: $$ T(j\omega) = \frac{1+j\omega/10}{(1+j\omega/50)^2} $$ ...
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1answer
308 views

Passive Sign Convention

Sorry, I know this is a very basic question, but I've already searched a few universities' sites and through my books but none of them are giving me a direct answer. If you specify the terminals that ...
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1answer
4k views

RC Circuit with Multiple Capacitors

I have been working on this problem and it is driving me absolutely crazy. The questions is asking for Vo for time greater than or equal to 0. I have successfully redrawn the circuit (shown below) to ...