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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1
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1answer
66 views

Superposition Theorem/Nodal Analysis

I'm having a little trouble understanding this worked solution. My understanding of superposition is that we "turn off" every independent power source except the one we plan on analysing, then we ...
0
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1answer
31 views

Finding the Current I1 using Polar Notation

For the circuit in Figure Q3. Convert all voltages and currents to the form X sin(t + φ ). You need only find the stead-state solutions. Solution My Steps ... It seems that I am going along ...
1
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1answer
88 views

Using Pspice to analyze BJT transistor

As always I have a rookie question. In a project, I need to analyze the circuit below in a way that the transistor would be in forward active mode. I need to calculate resistors and voltage sources, ...
5
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1answer
102 views

What's wrong with my boost converter math?

I'm working some equations for a boost converter, and running into a contradiction I don't understand. Assume a steady state, perfect efficiency, and continuous conduction. Total instantaneous ...
1
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2answers
61 views

Link between zero state response and the particular solution for an everlasting exponential input

In an LTI system, when the input is the characteristic function (i.e. an everlasting exponential function say \$e^{st}\$ ), the ZSR which is obtained by the convolution integral with \$h(t)\$ is ...
3
votes
2answers
783 views

Diode circuit analysis using ideal diodes exam problem

I've been reviewing some past exam and stumbled across this question So I need to find the current I through the middle diode and the voltage across the bottom left 10KΩ resistor. To try solve this ...
0
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1answer
62 views

How to do derating analysis

I need help in learning derating analysis for a vienna rectifier circuit (may be anything). Do you guys suggest any material to do the derating analysis by hand for each component understanding the ...
0
votes
1answer
423 views

Using an LM331 as a frequency to voltage converter, how to set frequency FSR?

I'm trying to use an LM331 in a frequency to voltage converter configuration. LM331 block diagram: I'm trying to implement this circuit from the datasheet for a supply voltage of 5V and an input ...
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1answer
77 views

Identifying this “Transistor”, in this particular circuit [closed]

I'm in FIRST robotics, and I've been helping with our robot over the past few weeks. Every robot (in FIRST) is required to have a status light, which is fancy-ily connected to some other gear. ...
2
votes
1answer
104 views

How to interpret this bode diagram

I have this bode diagram. I am wondering how to interpret this. We start off with 90 degree phase lag e.g. a integrator. Then at approx 12 Hz we drop another 180 degrees indicating two integrators. ...
2
votes
1answer
140 views

Derive transfer function from block diagram

I have this block diagram which I already reduced pretty much: Now I want to derive the transfer function from phi_o1 to q. ...
1
vote
1answer
115 views

Can't figure out voltage-controlled current sources

I'm trying to teach myself how to wire circuits, but I don't know if I got the correct answer for this? Where is a good place for me to learn the order of operations for solving circuits? Thanks.
3
votes
2answers
95 views

Thevenin analysis

I have a hard time understanding why Thevenin analysis works. I can see the math, and I can find the equivalent resistor, but I am not sure why it is a valid analysis from a practical point of view. ...
0
votes
1answer
50 views

Pulse-excited integrator reaching infinite potential?

I was given the following Op-Amp circuit to analyse and to find the potential V_out as a function of time, with V_in defined as the Heaviside step function: $$V_{\text{in}}=\begin{cases}0\mathrm{V} ...
1
vote
1answer
52 views

Diode small signal model and exponential model comparison

I'm working my way through the chapter on diodes in Sedra and Smith Fifth Edition Exercise 3.15 asks: Consider a diode with \$n=2\$ biased at \$1ma\$. Find the change in current as a result of ...
1
vote
0answers
58 views

Not seeing set_address packet using USBTrace

I'm currently exploring the wonderous world of the USB Stack. I'm using a PIC18F2550 and the USB IO example available at www.moty22.co.uk. The code works as expected, but when using USBTrace (or any ...
0
votes
0answers
31 views

Interpolation and error analysis

A quadratic piecewise interpolation is carried out for the function f(x)=cos(πx) for evenly distributed nodes in [0,1] (h=x_(i+1)-x_i, x_i=ih, i=0,1,...,πh). I am asked to bound the error. I believe ...
2
votes
1answer
258 views

Theoretical break frequency and bandwidth of notch filter

I'm trying to learn how to calculate the bandwidth and break frequency for the notch filter shown below. I was told that wye-delta and delta-wye transformation would be needed, but don't fully ...
7
votes
1answer
302 views

Why does this circuit oscillate?

The circuit below is an oscillator. When I simulate it with ltspice, it does indeed generate a waveform (although it doesn't seem to be a very pure sine wave). What I fail to understand is why it ...
1
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1answer
95 views

Complexity comparison of an adder and a multiplier

I have two algorithms with different requirements of addition and multiplication operations as follows: Algorithm 1: 100 additions 200 multiplications, total = 300 operations. Algorithm 2: 300 ...
0
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1answer
157 views

Sequential Circuit Diagram: D Flip-Flop

Sequential Circuit Diagram: D Flip-Flop Answer Key ...
1
vote
1answer
130 views

Can I use a Bus Pirate to drive this VFD?

So a few months ago I asked the question on how to analyze a display. Since then I have found out much information about this board. From some trace following it seems that Brown - DATA Red ...
1
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0answers
129 views

How to calculate resistor values for CFO differential amplifier Op-Amps?

I know that resistor calculations for current feedback amplifiers is different from their voltage feedback counterparts ( especially in higher frequencies as they have small impedance in inverting ...
1
vote
1answer
98 views

Changing the plot title in ngspice

I'm hitting a snag plotting some data with ngspice. I'm not sure of the syntax to use to add a title. According to the user manual: ...
2
votes
2answers
137 views

Nodal Analysis algebra simplification

I am doing part a in this homework: Doing nodal analysis of two op amps and came to these two equations: $$\frac{V_1-V_{ref}}{R_2} + \frac{V_1-V_{x}}{R_1} + \frac{V_1-V_{2}}{R_f} = 0 $$ $$ ...
1
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1answer
82 views

Multi Op Amp Analysis

I am asked this for homework: I am trying to do nodal analysis for part A of the question but am running into problems with number of unknowns versus number equations. Assuming I chose my nodes ...
1
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1answer
141 views

In complex power and power factor analysis, how do I get the Thevenin impedance if there is a dependent source?

I'm preparing for my exam tomorrow, and I've found something ambiguous. How do I get the Thevenin impedance for this circuit? Is it possible for me to get the impedance of the dependent source and ...
3
votes
0answers
308 views

Analyzing the Protocol

I am trying to understand a protocol (shown in figure 1) . For now this I have understood that data is transferred at high to low clock. as shown in figure. and the sync is for every 8-bit. But then ...
2
votes
2answers
105 views

How to use nodal analysis in resistive circuits

I am trying to solve a question in a text book of resistive circuit using KVL. The circuit is as follows : I have to calculate the voltage through each resistor. What I have got is: V1 = 24V V2 = ...
2
votes
2answers
189 views

Is this electrical circuit solvable?

I am trying to solve a circuit with two current sources. I1, I2, V1, V2 are known. R1, R2, R3 are unknown. I've tried node analysis, but I can only come up with two equations \$\dfrac{V_2}{R_1} + ...
7
votes
2answers
562 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 ...
3
votes
3answers
635 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 ...
3
votes
4answers
2k views

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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votes
1answer
127 views

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

For this sequential circuit are the outputs "next state function" for q1 and q0? $$D1 = (Q1)Y' + (Q0)Y' $$ $$J0 = Y'(Q1)' + Y((Q1)'+(Q0)')$$ $$K0 = Y$$ $$Q1 = D1$$ $$Q0 = (J0)(Q0)'+(K0)'(Q0)$$
0
votes
2answers
103 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. ...
-1
votes
1answer
33 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
votes
2answers
294 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 ...
1
vote
3answers
194 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 ...
1
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1answer
119 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 ...
3
votes
2answers
458 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
votes
2answers
796 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 ...
3
votes
2answers
127 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 ...
2
votes
2answers
597 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 ...
1
vote
1answer
673 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 ...
1
vote
1answer
846 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 ...
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votes
1answer
246 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 ...
0
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1answer
478 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 ...
5
votes
2answers
203 views

Voltage divider ambiguity

considering the following circuit : ...
2
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1answer
695 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 ...
0
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1answer
261 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 ...