Electrical Engineering Stack Exchange
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Questions tagged [ideal]

For questions about ideal components (voltage sources, diodes, op amps, etc.). Use in conjunction with the tag(s) for the ideal component(s) (e.g. use the "operational-amplifier" tag for questions about ideal op amps).

For questions about ideal components (voltage sources, diodes, op amps, etc.). Use in conjunction with the tag(s) for the ideal component(s) (e.g. use for questions about ideal op amps).

72 questions
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What is a typical diode's ideality factor?

Some background, for anyone unfamiliar: The Shockley diode equation is $$ I_D = I_S·\left(e^{\frac{V_D}{n·V_T}}-1\right) $$ with the quantity \$n\$ called the ideality factor, a number between 1 and 2. Ideal diodes have an ideality factor of 1,…
Hearth
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Solving an ideal opamp-circuit leads to a contradiction

Well, I am trying to analyze the following circuit: simulate this circuit – Schematic created using CircuitLab When I use and apply KCL, I can write the following set of…
Jan Eerland
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7 answers

Ideal behavior of op-amps

I have been studying about op amps and there is something I can't get my head around. The thing is, when assuming an ideal op-amp, one of the restrictions we obtain is that the voltage in both the inverting and non-inverting inputs is the same. But…
Gaston Castillo
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2 answers

Ideal diode confusion

I am struggling with understanding ideal diodes and have reached my wit's end in trying to find where I am making a mistake in my assumptions about how these work. What I do not understand is that, from what I can tell, only the first assumption…
Hamza Mahmood
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1 answer

How do I turn off an LTC4359 using the SHDN pin?

I am attempting to design an Ideal Diode Controller for application in a 12 V automotive circuit using an LTC4359 as the controller. I want to implement the shutdown facility available with the controller to turn it off using the ignition line of…
Ishan Karve
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4
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4 answers

Question about ideal transformers and inductors

Recently I was studying about alternating currents and transformers and I got confused about some of the concepts. I tried a lot of sources but none of them seemed to address the problem. I understood that in a purely inductive DC circuit, the EMF…
user8718165
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Identifying which diodes are on in a full wave rectifier

For the circuit above, I am looking for which diodes are on during the positive and negative cycle. Is it safe to assume that I should just trace the path of the current based on where the diode is pointing? For example, during the positive cycle,…
romeoPH
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Gain not containg the output, non ideal, resistor

I was working a mathematical model of a non ideal op-amp circuit and I saw a slide in the following presentation: The question I have is the following: Why does the close-loop gain \$\frac{\text{V}_\text{o}}{\text{V}_\text{i}}\$ not contain de…
klopiu
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Difference between an ideal integrator and a practical one

I only learned about the ideal integrator design (top circuit), but when I searched for a practical model for an integrator I found it was like the one in the bottom circuit. Two new elements, Rf and Rs are added to the ideal model. I don't quite…
HelperKing
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DIY ideal diode: What problems will I encounter with this circuit?

I have a 3.3 V LDO that I don't want to use for more than ~200 mA. I need 600 mA. I know that just putting them in parallel is a bad idea. Using op-amps and some sense/shunt resistors, I made ideal diodes to parallel them instead. I've presented it…
Helpful
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Ideal Transformer Currents Relationship

I'm currently quite confused with the relationship of the currents for an ideal transformer when it overlaps with multiple mesh currents. It was defined that for: $$\frac{\bf I_2}{\bf I_1}=\frac{1}{n}$$ However, for the following example The…
ken
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Does an ideal voltage source go against Kirchhoff's voltage law?

Very new to electronics. Stuck on this topic: In a circuit with zero resistance an ideal voltage source of example 5 volts will produce 5 volts, since ideal voltages don't have an internal resistance. But does that not go against Kirchhoff's voltage…
Jaafar Kamalah
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4 answers

What happens to parasitic capacitance and inductance in a superconductor?

Do the parasitics also become [more] ideal? Or are all changes solely due to the perfect conduction? If not, how are the parasitics affected? Such basic information seems necessary to engineer any purpose-built device utilizing superconductors,…
rdtsc
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2
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Does a voltage source/diode in a circuit act as an open or a short circuit?

This question originates from a diode question in which we modelled diodes using the simple piece-wise linear model. According to the lecture notes, the diode acts as a battery after attaining Vf(forward bias voltage). This creates a seemingly…
Frank
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ideality factor diode > 2 possible?

Using non-linear regression I have worked out the ideality factor to be greater than 2 (2.04987187490894) using spreadsheet software. Is this realistic for a diode. Is the maximum ideality factor for a diode 2? The data are as follows: VOLTAGE :=…
Saavin
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