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Questions tagged [homework]

Use this tag if the question you are asking is an assignment or homework with which you require assistance. EE.SE is not a homework answering service, so make sure you show what you have attempted so far and are specific as to where you have gotten stuck.

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14 views

Transmission line theory - calculating phasor voltage over open circuit

I was working through a transmission line problem and ran into some trouble. I'd like to calculate \$\tilde{V(0)}\$ the phasor voltage over the open circuit corresponding to \$z=0\$. I'd like to ...
-1
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0answers
41 views

Master-slave circuit with enable defect

I have this task to identify a defect with this circuit, though I cannot see it. I have a feeling it has something to do with the enable input as all the master-slave circuits I come across only ...
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0answers
18 views

Estimation of the FWHM Power width of a pulse at output of a fibre [on hold]

A Gaussian shaped optical pulse with a FWHM power width of 200ps is launched into a 50km length of standard single mode optical fibre. The optical source is a DFB at 1550nm with ems spectral width of ...
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2answers
82 views

What is the transfer function? [closed]

I would like to know what is the transfer function of the circuit of the figure.
2
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1answer
58 views

Resistor combining problem

How can I get I1? I tried combining the two 10 ohms resistors on the right and up in parallel but I always end up getting 2A which is a wrong answer.
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1answer
33 views

Voltage controlled current source question

Need to find ratio Vs/Vo in terms of the 3 resistors and gm. I have expressed Vo/Vs as gmvgsR2/Vs but am unsure how to express Vgs in terms of the R1, R2 R3 and gm.
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0answers
12 views

Effect of base doping on early voltage,base transport factor and emitter injection efficiency?

According to me as base doping increases recombination will be less at base region so base transport factor and emitter injection efficiency will increase and as effective base width will decrease due ...
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0answers
63 views

How to create 1:4 Demux diagram using 1:2 Demux?

By 2m = n where m is the number of select lines and n equals the number of outputs (4) I found that I will need 2 select lines in total. But, I don't even know how to start drawing the actual circuit ...
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0answers
27 views

Difference between quantity and signal in VHDL-AMS

What is the most important difference between quantity and signal in VHDL-AMS? Can a signal takes a type of "real"?
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0answers
47 views

A simple sawtooth signal generator

I have been given a circuit like this: Which will produce a sawtooth signal: Now I have been given an additional adjustable DC voltage source. The question is to design and draw a new circuit ...
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0answers
34 views

Determine Y-parameters for given circuit. [Used Nodal Analysis]

I am trying to solve this circuit for past 3 hours, no success, so I am posting here. simulate this circuit – Schematic created using CircuitLab I used nodal analysis, I will go over the ...
-9
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2answers
83 views

What is the value of R? [closed]

What is the value of R? I need the solution.
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1answer
42 views

Overdrive Voltage Effect on Cascode Operation

Working on this exercise: I understand that if all the transistors in a cascode have the same current and the same Vgs then they will have the same Vov. However in this case the Vgs do not seem to be ...
1
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2answers
80 views

Which region is the transistor operating at?

PNP and NPN transistors in the circuit have identical Is values. Based on the PNP transistor is connected to a DC voltage source. k = 1.38064852×10-23 J/K qe = 1.60217662 ×10-19 C Is = 0.69 fA at 17°...
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1answer
69 views

Calculate the capacitor voltage for t < 0 and t > 0 for the circuit below

Please help me calculate this. I tried using the thevenin equivalence method however I'm not familiar with two independent sources in a circuit. When I was simplifying using thevenin method the ...
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0answers
48 views

Parallel MOSFET Circuit Analysis

I'm solving part b of this question I started with the assumption that both MOSFETs were in saturation mode to simplify calculations, I then solved for the circuit, tested the assumption using vds, ...
-1
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2answers
84 views

PS/2 mouse / keyboard interface info and classification

My hardware interfaces teacher in the university gave a task to find info about PS/2 interface and fit it into a classification by answering a list of questions. Here's what I've found: Which type ...
1
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0answers
82 views

How to know Number of turns

In closed magnetic circuit, How many turns are when a conductor winded around a square mild steel core with permeability (Ur=2410)? The outer length is 20 cm and inner length is 16 cm. The current ...
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1answer
76 views

Kirchoff law exercise

I need to determine the current across the 4 ohm resistor (name it I1). What I calculated, thought out so far : Current of 2 ohm resistor : I=5V/2ohm=2,5A. I Think this current is flow towards the A ...
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1answer
90 views

electrical homework help

I need to solve exercise 57. I need to determine the voltage between points A and B in diagrams (a) and (b). What I think so ...
1
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2answers
148 views

Common emitter amplifier gain with load resistor?

I have a problem I am working on where I have to find the voltage gain of the following circuit with a dc collector current of 0.3mA. My attempt at a solution involved using the formula A=-(RcIc)/Vt ...
2
votes
1answer
167 views

Fourier Series Expansion of the phase current of a three phase full wave bridge rectifier

I am really struggling with this homework problem where I am asked to calculate the harmonic components as a ratio of the first fundamental harmonic of the phase current of a three phase rectifier ...
3
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2answers
215 views

Output resistance of MOSFET circuit

I am trying to find the output resistance \$Rout\$ of this circuit consisting of 3 n-type MOSFETs. It is given that all 3 MOSFETs have \$g_m=4 mA/V^2\$ and output resistance \$R_o=100k\Omega\$. ...
1
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2answers
111 views

How to find v through superposition theorem in the following ciruit

What is the voltage V of the attached circuit? Using super position theorem. When i active the 9V source & short 12 V source is the current follows in 20 ohms, 10 ohms. & 4 ohms? Or it only ...
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2answers
114 views

How to Find R.M.S value [closed]

how can I find the R.M.S value of this question?
0
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1answer
77 views

Current biasing in npn transistors [closed]

I need to calculate bias current Ic1 and Ic2. I understand that both currents are the same and, because of beta being infinity, there is no base current (Ic1 = Ic2 = Ie1 = Ie2) and Ic3 = 2 * Ic1. I am ...
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2answers
94 views

Receiving power from antenna (Homework)

The question: "At a carrier frequency of 2 GHz, assuming a transmit antenna gain of 3 dBi and a receive antenna gain of 0 dBi, calculate the line-of-sight received power at a distance of 100 m from ...
1
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2answers
74 views

DC Black Box and Thenevin Equivalence

There's a DC Black Box, and my goal is find the Thevenin resistance within the black box. By connecting a digital mulitmeter to the terminal, I have found that the "open-circuit" output is \$0.647\ \...
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1answer
48 views

Double BJT circuit with one BJT off and one in saturation

In the circuit below, due to the base voltage, the circuit becomes a common-emitter setup. However, assuming a reasonable value for the base current the BJT should be in saturation. However the value ...
0
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1answer
95 views

How do you visualize the frequency spectrum for a digital waveform? [closed]

How does the mathematics of a single or periodic rectangular pulse help us quickly visualize the frequency spectrum for a digital waveform? Develop the ideas behind this. My professor posed this ...
1
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0answers
30 views

Determining the Impedance of the antenna on a known circuit

I am stuck on how to approach the following problem: I have a graph with both the response of a short-circuit and an unknown impedance antenna. The only information I have from this graph is the ...
2
votes
2answers
566 views

Combining resistors in a simple network

I'm trying to reduce this circuit into 1 resistor and the current source. The dots indicate nodes, which I'm not sure makes a difference... Can I combine R1, R2, and R3 in series, then, R4 and R5 in ...
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3answers
102 views

Triac Dimmer Supplying a Purely Inductive load

I was asked a question in my lab viva today, on a triac switch supplying a fixed value inductor of 0.2 henry. How will the current and voltage of the inductor vary, if the triac's firing angle was ...
0
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1answer
75 views

Equivalent noise resistance(s) - 2 stage amplifier

I came across this question in my textbook: The first stage of a 2-stage amplifier has a voltage gain of \$150\$, an input resistance of \$1500 \Omega\$, an equivalent noise resistance of \$700 ...
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2answers
81 views

Signals and Systems - Taking Integral of Unit Step Function

I am a taking signals and systems course and my professor posted the solutions to our latest homework and I am trying to understand one of the steps. Below is the solution. Bracketed in red is what I ...
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0answers
24 views

What is the maximum number of natural frequencies given circuit elements?

I'm learning forced and natural responses, as an exercise the textbook gave 4 scenarios (2R&C, R&2C, 3R&2L, and 2R&C&L) and asked what the largest number of natural frequencies for ...
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3answers
100 views

What value of C should be added in parallel to make the circuit appear purely resistive?

I'm currently working through Cogdell's Foundations of Electrical Circuits and came across problem 4.39 d) as shown below: Earlier in the question I found the frequency-to-be-used as 43.3x10^3 rad/s. ...
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0answers
37 views

Impedance Expression for a Transmission Line

I'm studying transmission line theory and this is the expression I derived for the input impedance for a lossless transmission line: $$ Z(\omega) = Z_{\inf} \frac{1+e^{i\frac{\pi\omega}{\omega_{0}}}}{...
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0answers
154 views

Capacitance of a particular transmission line

Is it possible to derive the expressione of the equivalent capacitance seen by AB for this kind of transmission line, where w is the width of the wire, d the spacing, l the length of the repeated part ...
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1answer
46 views

Norton equivalent circuit question

I'm unable to get the correct result for this question. I've tried using ohm's law like this: 30 = INRTh I'm not sure if the current through the shorted branch ab would be the same as the current ...
0
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1answer
8k views

Design a 3-Bit Up Synchronous Counter Using JK Flip Flop (odd vs even numbers)

I have to design 3-Bit Up Synchronous Counter Using JK Flip Flop counters. The first one should count even numbers: 0-2-4-6-0 The second one should count odd ...
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0answers
24 views

CSxCC stage, series-shunt feedback, identify sign of feedback

MY ANALISIS The stage is inverting x non inverting = non inverting. Shunt sampling since it perturbs the output current, Series mixing. Thus if a positive input voltage is applied, the output is ...
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1answer
50 views

Determine transconductance of a JFET given only voltage gain and internal drain resistance

I have a homework question as follows: If a JFET having a specified value of rd=100 kΩ has an ideal voltage gain of Av(FET) = -200, what is the value of gm ? As far as I know, the closest formula for ...
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0answers
45 views

Brune test in a parallel-parallel two-port network connection

Alright, so I am struggling so much with this problem that I am solving, since to my mind this specific example is a bit more challenging to other two-port network problems that I have solved. The ...
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0answers
59 views

Help with JFET circuit analysis

Just having trouble analysing the following circuit with the information given. where k=0.16mA/volt^2, Vt = -1.7V and A = 1V. I believe you have to first find an expression for V_gs but the ...
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1answer
50 views

Thévenin equivalent of a Norton equivalent

A very simple question. When solving circuits, and you need to solve it using the mesh analysis, you want the circuit to only have voltage generators.I wonder if for an independent current generator ...
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1answer
29 views

Match the corresponding equation to the RC circuit

By trial and error, I have found that the equation for circuit 1 is the second equation listed. Can someone please take the time to explain this to me. I have been working to "combine" the circuit ...
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1answer
111 views

Equivalent R for Bandwidth of non-ideal parallel RLC circuit

I'm tasked with calculating the bandwidth of a tank circuit shown below. I can see that it is essentially a parallel RLC, for which I know BW=1/RC However that ...
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3answers
129 views

How to trigger a pulse until a capacitor fully discharges based on the output of a comparator

In my circuit I have a comparator which compares the output of a sine wave with a staircase wave, if the staircase is above the sine wave, I wish to use a Mosfet in its cut off mode which will allow ...
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1answer
118 views

Kirchoff's Law Loop Equation Problem

This is the question I am struggling with I have found a node equation: $$ I_3 = I_1 + I_2 $$ I have found two loop equations: $$ 50 = I_3 + R_1 \times I_1 $$ $$ 50 = I_3 + R_2 \times I_2 $$ I'...