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Why does photodiode junction capacitance affect operating bandwidth? (from a semiconductor physics model perspective)

Here is a typical equivalent circuit diagram of a photodiode. I feel like this circuit model broadly makes sense to me. You have a diode, in parallel with the junction capacitance. The photocurrent ...
genericpurpleturtle's user avatar
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Equivalent inductance seen from a winding

I would be having a little trouble understanding how to do this problem of magnetic circuits. It asks me to calculate the equivalent inductance seen from winding N2. I know how to calculate the ...
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Is this equivalent circuit transform involving resistors valid?

I was wondering whether this transform is valid The resistance between ST3 and ST4 $$R_{S34} = \frac{(R_1+R_2)(R_3 +R_4)}{R_1+R_2+R_3+R_4}$$ The resistance between ST1 and ST2 $$R_{S12} = \frac{(R_1+...
Stevan V. Saban's user avatar
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2 answers
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Equivalent resistance of a network

Determine the equivalent resistance across the terminals \$a-b\$. I placed a \$1V\$ battery across \$a-b\$ and then used mesh analysis on \$4\$ loops which resulted in using \$4\$ equations. But is it ...
a_i_r's user avatar
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3 votes
2 answers
211 views

How to determine equivalent resistance between terminals?

What kind of symmetry I can use to get the result? I think I have to redraw a circuit, but how?
weycdicdib's user avatar
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1 answer
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Rigorous definition for two circuits being equivalent [closed]

Circuits may be rigorously defined in terms of graphs and differentiable functions, as done here. Yet I have not being able to find a rigorous definition for two circuits (containing only voltage ...
Sam's user avatar
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Time function for an equivalent circuit

In the IEEE magazine 6. NO. 3. JULY 1991 A Novel Soft-Switching Full-Bridge DC/DC Converter: Analysis, Design Considerations, and Experimental Results at 1.5 kW, 1OOkHz the following converter has ...
i33SoDA's user avatar
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1 answer
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For vector control inner loop Iqs & Ids, how to match with the per-phase equivalent circuit currents of induction motor in real?

Although I can understand both of the diagrams above, I am confused about the relations between them. As marked in the per-phase equivalent circuit of a 3-phase induction motor above, we assume the 3-...
PulleyAbaAba's user avatar
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4 answers
126 views

Where to place the capacitor when modelling a single long wire?

Consider a high-voltage power line that is hundreds of kilometers long. Such a wire has a capacitance, inductance and resistance. This answer to a previous similar question contains the following ...
Sibbo's user avatar
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2 votes
2 answers
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Equivalent resistance of network of resistors arranged in a cube shape

To determine the equivalent resistance across \$AB\$,I noticed that the three resistors in the lower face of the cube are in parallel combination. So I replaced all three with a single resistor \$\...
a_i_r's user avatar
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Replacing resistances with equivalent resistance

In the above original circuit,by node analysis,we see that \$R_3\$ and \$R_4\$ are in parallel combination. So we can replace the two with an equivalent resistance \$R_e\$. For that we need to remove ...
a_i_r's user avatar
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Choosing points for analysing equivalent resistance

I realized there is something fundamental about equivalent resistance I don't understand in terms of application. I understand the part about mechanically simplifying resistors into one resistor, just ...
HFOrangefish's user avatar
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3 answers
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Calculation of equivalent resistance

I need to calculate the equivalent resistor between knots A and B to then use it in Thevenin Generator; it says the result should be (R // Zl) + (R // R) however I don't quite get why that's the case.
khaled baccour's user avatar
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1 answer
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Delta to Y with sources?

I'm wondering if this transform is possible: I tried doing a source transformation to change this to a regular delta network with two current sources going to nodes a and b, but wasn't sure how to ...
KKZiomek's user avatar
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pspice equivalent inductance calculation

I want to implement an equivalent inductance circuit with the pspice program. The circuit-wide inductance in the first picture is 2m I think. So I implemented and checked the equivalent inductance ...
mouin's user avatar
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1 answer
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What is the resistance of this equivalent-circuit?

In order to cofigure an ADC, I need to know the input resistance to the ADC Pin of a uC, designated as R_source in the following equivalent circuit: From ...
ilja's user avatar
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1 answer
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How do I find the equivalent resistance on this circuit?

This is a circuit that I have on a problem set. I believe that, starting from a, the diagonal resistor is in parallel with the leftmost resistor. From there, the equivalent resistance is in series ...
big_yoshi's user avatar
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1 answer
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Characteristic impedance equivalent cirucit [closed]

As far as I've understood, the characteristic impedance Z0 of a transmission line corresponds to the equivalent impedance of the line when it's not connected to any load. If one would like to ...
Urza_tron's user avatar
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1 answer
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Thevenin Equivalent with Superposition Theorem

I have the following circuit that I found (here) https://www.tutorialspoint.com/network_theory/network_theory_thevenins_theorem.htm The author uses the node analysis in order to calculate the Thevenin ...
Homer Jay Simpson's user avatar
9 votes
4 answers
805 views

Extending the Delta-Wye/∆-Y Transformation to higher polygons

I was looking at the derivation of the ∆-Y Transformation and decided to replicate the process with a square and its diagonals, i.e. I tried to create a Square-Cross/□-X transformation. But the ...
Salieri's user avatar
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1 answer
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The two capacitors are in series but positive end of one plate is connected to positive end of the other

Like the title says, my task is to find the initial voltage across the terminals. The two capacitors are in Series with positive end of one plate connected to that of another. The given information ...
RK Eshat's user avatar
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2 votes
3 answers
433 views

Why is Thevenin Voltage of this circuit equal to the voltage source?

I am well aware that Thevenin voltage is equal to the open circuit voltage at the end of the circuit. The circuit information are: \$𝐕_𝐴\$=50∠0 V, \$𝐈_𝐵\$=5∠0 A, \$𝑅_1\$=10 Ω, \$𝑅_2=10\$ Ω, and ...
RK Eshat's user avatar
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1 vote
1 answer
131 views

How to find the equivalent inductance of this circuit?

In the image that is given below, I am not able to figure out which is in parallel or in series to what as they are all almost connected to each other. Also, it was given that all inductors are 1mH. ...
RK Eshat's user avatar
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2 answers
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Equivalent voltage source

I have the following circuit (see picture 1) where the switch \$ 0 - 1 - 2 \$ is in the "state" \$ 0 - 2\$. The values are \$ R_1 = 20~\Omega \$ , \$ R_2 = 30~\Omega \$, \$ R_3 = 10~\Omega \...
syphracos's user avatar
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1 answer
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How can I solve this Thevenin equivalent problem?

I came across an exercise in Linear Electrical Circuits that says: Find the Thevenin equivalent in the terminals A,B as shown in the picture below. Regarding the $$R_{Th} = 6||4 = \frac{6*4}{6+4}=\...
Homer Jay Simpson's user avatar
1 vote
2 answers
77 views

Which is the equivalent voltage and resistance values in this circuit with pull ups at different Vcc?

I have two PCB that i have to interconect. In the first one it is R1 (pull-up resistor) in the second one is R2 (pull-up). The yellow rectangle represents the interface between boards. My questions ...
Developing Electronics's user avatar
1 vote
0 answers
109 views

How to convert Thévenin equivalent to Norton equivalent in this schematic?

I am learning the bus admittance matrix from Power System Analysis by Hadi Saadat electrical engineering. I have a very big problem in chapter 6.2 - Bus Admittance Matrix. At the beginning of chapter ...
user16266657's user avatar
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1 answer
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Equivalent electrical circuit changing and power balance calculation [closed]

I tried to change this circuit in three different ways, but the power balance is not the same. The least power balance that I got was ~50 W more and we need to find the balance between 0 and 5 W. ...
Dont Know's user avatar
1 vote
3 answers
228 views

Find the equivalent resistance

I have to simplify the following circuit by using equivalent resistance. I know it probably should be very simple to do it, but for some reason, I can’t tell if the two resistors in the “internal” ...
selenio34's user avatar
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Equivalent impedance of a circuit

I'm trying to figure out the equivalent impedance of the right side of this circuit (so the capacity, inductance and right resistance) : I see this result in the solution of my exercice: But I don't ...
c.leblanc's user avatar
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Special cases in ideal source transformations for equivalent cirucits

I don't exactly understand what's meant by these transformations. Are we supposed to replace one of the sources with a resistor? What's the resistor's value supposed to be? I couldn't find sources ...
HasanTheSyrian_'s user avatar
1 vote
2 answers
106 views

Do Grainger/Stevenson incorrectly describe an equivalent circuit for a transformer?

The equivalent circuit for a transformer, as shown above, is supposed to be consistent with the following equations: \begin{align} \small{\mathrm{Equation~2.22:}}~V_1&=(r_1+j\omega L_{11})I_{1} + (...
artist_and_not_EE_by_training's user avatar
1 vote
3 answers
122 views

Do no-load current and load current share path in transformer?

In the equivalent circuit for a transformer, does only the no-load current I0 pass through core loss Rc and magnetizing reactance Xm? Or does load current also pass through Rc and Xm? The figure ...
artist_and_not_EE_by_training's user avatar
3 votes
1 answer
971 views

Output resistance of an amplifier

While studying amplifiers, I came across the AC equivalent circuit of an amplifier: To calculate the output resistance of the amplifier, the input signal was set to zero and the load resistance was ...
Essar's user avatar
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