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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.

1
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1answer
63 views

How do I measure the voltage across R3 (Va) in this circuit?

This circuit has been troubling me for a few hours, I've been able to measure Vout and the Thevenin Resistance, however, I haven't been able to calculate the voltage (Va). Any help would be ...
3
votes
1answer
167 views

Finding the current in a parallel circuit

How could we find the current that passes through each resistor in this circuit? The problem is that we don't have the voltage of each resistor to find the current, because the voltages of the ...
0
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1answer
59 views

Diode circuit analysis solution

I am not familiar with circuit analysis, although I can manage to solve basic circuit. However, I am currently stuck with a problem and I am not sure about the solutions. If anyone could have a look ...
1
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2answers
54 views

When is a Gate potential zero?

I have this fairly simple NMOS and it is mentioned that I can determine the Source current \$I_3\$ with the formula \$ I_3 = \frac{K}{2}(V_{GS} - V_{th})^2 \$. Here they equalize Gate Source Voltage \...
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0answers
20 views

Transfer function with separate time delays in each term

We've been given the problem below for our current assignment As far as I can recall, I have never seen a transfer function with time units in the function itself, added onto each separate term. I ...
1
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1answer
97 views

Direction of current flow in resistor networks

We have a simple resistor network \$g\$ with \$5\$ nodes and \$6\$ edges (resistors) as given below: We assume all resistors have the same resistance (say \$1\$ Ohm, so homogeneously distributed ...
0
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2answers
88 views

8051 microcontroller problem to find execution time of part1 for a given code

For the below mentioned 8051 assembly code: Time elapse: MOV R0,#100 Part 1 \$ \quad \, \, \,\,\$ : MOV R1,#50 Part 2 \$ \quad \, \, \,\,\$ : MOV R2,#248 Part 3 \$ \quad \, \, \,\,...
0
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0answers
72 views

Building a 6-inputs XOR gate with only 12 AND/OR gates

I would like to compute a 6-input XOR gate with only 12 AND/OR gates, any number of inverters can be used. I failed to find any optimization with the K-map and so far I can only decompose it with 13 ...
0
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1answer
77 views

Common Emitter Stage BJT Amplifier with Early Effect Inclusion

How can I find Rin, Rout and Gm parameters of a BJT amplifier in common emitter stage without neglecting Early Effect? We have such homework and I couldn't find the exact same example in Behzad ...
0
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2answers
64 views

Output of AC op amp circuit has unknown superimposed signal on top of expected output signal

I am trying to find the voltage gain of a certain ideal op amp circuit with a sinusoidal input. However, when I simulate the circuit, the output shown seems to be my calculated output but with a ...
2
votes
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.
0
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1answer
34 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
26 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 ...
0
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0answers
147 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
34 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"?
1
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0answers
55 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 ...
0
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0answers
43 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
113 views

What is the value of R? [closed]

What is the value of R? I need the solution.
0
votes
1answer
83 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
99 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°...
0
votes
1answer
147 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 ...
1
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0answers
75 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
votes
2answers
91 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
92 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 ...
0
votes
1answer
79 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 ...
1
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1answer
92 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
312 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
380 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
votes
2answers
683 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
vote
2answers
158 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 ...
-2
votes
2answers
131 views

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

how can I find the R.M.S value of this question?
0
votes
1answer
81 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 ...
1
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2answers
96 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
174 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\ \...
0
votes
1answer
97 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
votes
1answer
141 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
32 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
571 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 ...
1
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3answers
137 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
votes
1answer
153 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 ...
0
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2answers
113 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 ...
1
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3answers
104 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. ...
0
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0answers
49 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}}}}{...
0
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0answers
157 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 ...
1
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1answer
71 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
votes
1answer
12k 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 ...
0
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0answers
25 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 ...
0
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1answer
88 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 ...
1
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0answers
72 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 ...
0
votes
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 ...