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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3answers
343 views

Thought Process on Designing Circuits

I'm currently in my second year of computer engineering. I've taken circuit analysis courses and have a good general understanding of components, and a little bit of digital design, however, I'm very ...
1
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0answers
48 views

I'm trying to determine the Thevenin voltage of a circuit using the node voltage method

I'm trying to determine the Thevenin voltage between the terminals a and b on this circuit: Notice that I've named the three essential nodes \$v_1\$, \$v_2\$ and \$v_3\$. I've highlighted the ...
2
votes
2answers
48 views

DC analysis of common source MOSFET circuits to find gate voltage using different power supplies

simulate this circuit – Schematic created using CircuitLab strong text I am solving problems on DC analysis of MOSFET circuits. We are supposed to find various parameters like Id(Drain ...
0
votes
1answer
62 views

Since the z-transform of the zero order hold is 1, why bother including it in analysis or simulation?

The z-transform of the zero order hold is 1. So why should it even be considered in the discrete time analysis or simulation of discrete time control systems? ...
0
votes
0answers
9 views

Application of SIMPLIS POP analysis to converters with AC input

Is there any restrictions on switching frequency of the converter? SIMPLIS help says: Converters with AC inputs will only POP under very specific circumstances. These requirements are: ...
2
votes
4answers
625 views

How to change the frequency of AC supply?

Im using an inverter to convert Dc into Ac from battery. I want to control the frequency of the alternating current ie., increase and decrease gradually (eg: 1Hz 2Hz 3Hz... 60 Hz). Is it possible to ...
-1
votes
1answer
54 views

AC Analysis Mindset [closed]

I'm just trying to solidify my foundational knowledge of ac analysis. So when approached with a basic circuit, lets say a RLC circuit, should my first instinct be to convert each group of components ...
0
votes
3answers
92 views

Different time constants for charging and discharging of modified RC circuit

I recently performed a test in an electrical measurements lab which left me confused. I measured the response of the following circuit: And obtained the following output: According to my ...
3
votes
2answers
205 views

Av for small signal analysis with BJT for unbypassed emitter and ro in place

My question is about another question on this site. On that question Z(in) for small signal analysis with BJT for unbypassed emitter and r0 in place Zin is asked for a common emitter configuration ...
0
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0answers
47 views

transient analysis in aim spice

How do I carry out the transient analysis of series RLC circuit using AIM Spice? I can't figure out what values should be given for step size and final time. Also, I was seeing some tutorials and ...
-1
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1answer
50 views

analysis square waves oscillator: how do I calculate the values?

Which are the Vc (V+) and V-, I's and Vout values in these circuits? The node i's and the Vc and Ic?
1
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2answers
90 views

What is the sign convention for generated power?

Generally speaking, generated power is denoted as negative, correct? If I understand correctly, this is just the convention. Conceptually, I think of it kind of like a force, it has a magnitude and ...
3
votes
2answers
619 views

Thevenin equivalent resistance of circuit with diagonal resistors

I'm trying to find the Thevenin equivalent for part A of this circuit: I begin by opening the circuit at the dotted line of part A. Then I try to find \$V_{oc}\$ across the two terminals that are ...
0
votes
1answer
57 views

Should I assign currents to voltage sources in my circuit analysis

Mortals! I apologize if my question may seem, foolish, but I have a need of understanding a process in analyzing circuits. You see, when we are looking at resistors (non-sense, my lightning never ...
1
vote
1answer
40 views

PMDC Motor transfer function

I'm doing an analysis of a PMDC motor and I don't understand something about the transfer function. I have the following equation: \$(K_t\frac{1}{((s* L_A) + R_A)})(V_I(s)-k_b\omega(s))= ...
2
votes
2answers
141 views

Poles in electrical engineering

I'm currently an undergraduate electrical engineering student who recently took an elective mathematical course on complex analysis, where we learned about all kinds of singularities for complex ...
1
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1answer
384 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
votes
1answer
37 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
vote
1answer
213 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
votes
1answer
127 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
111 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
5k 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
votes
1answer
114 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
1k 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 ...
-1
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1answer
86 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
108 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
170 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
218 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
121 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
52 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
140 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
75 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 ...
2
votes
1answer
540 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 ...
8
votes
1answer
367 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
115 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
votes
1answer
247 views

Sequential Circuit Diagram: D Flip-Flop

Sequential Circuit Diagram: D Flip-Flop Answer Key ...
1
vote
1answer
152 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
244 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
171 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
169 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
vote
1answer
88 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
vote
1answer
189 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
438 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
122 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
203 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} + ...
8
votes
2answers
1k 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
926 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
4k 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
159 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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votes
2answers
111 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. ...