# Tagged Questions

Theory is a contemplative and rational type of abstract or generalizing thinking, or the results of such thinking. Depending on the context

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### Finding Rth( thevenin' s equivalent) [on hold]

Sir, I am stuck on this problem....: A circuit is given with its input terminal open circuited..in that how can we find Rth.. Should we short circuit the input terminal or make it open circuit and ...
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### Why is there current flow in the sub-circuits?

I'm struggling with the theory of this(unusual) circuit: simulate this circuit – Schematic created using CircuitLab The load receives no power at all, due to the voltages cancelling out, ...
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### How Would a CPU Improve if its Logic Circuits were Reduced? [closed]

Is there an estimate as to how a common CPU (for example, Intel i7) would improve if all of its logic circuits were reduced to their theoretical minimum, in the sense explained here? By "improve" I ...
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### Theoretically simulating photo-voltaic solar panels using math/code

I'd like to simulate the behavior of PV solar panels and model how various parameters affect their performance. For example the effects of irradiance, temperature, and series and shunt resistors. I ...
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### BJTs drawing collector current from a limited current source

simulate this circuit – Schematic created using CircuitLab Let's make everything ideal by ignoring the voltage drops: Q1's allowed collector current is: 22.4 mA Q2's allowed collector current ...
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### Ceramic caps vs electrolytic. What are the tangible differences in use?

A quick google around and all I seem to be able to find are people talking about the physics & the chemistry of the capacitors but not how this affects choosing which to use. Avoiding talking ...
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### Two batteries connected to a resistor

In the circuit shown here the conventional current direction is from V2 to V1 and is equal to 3 Amp. I understand the theory. But, if I make this circuit with two batteries, according to the schematic ...
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### How does a cascode or beta-enhanced voltage amplification stage work?

I'm studying electrical engineering and we just finished a project where we had to build a power amplifier. But I think I can do better than what we did. I read Distortion In Power Amplifiers where ...
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### Control: what is the proper justification that you can't just make the output equal to the input if the system produces unstable output

Suppose we have a signal, it goes into the plant and generates an unstable response, a common question then arise at that point is why can't we just set our output to a "hard-coded" input. Think of ...
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### Norton's and Thevenin's theorems importance

Are Norton's and Thevenin's theorems used in real life? And in which situations? I'm reading a circuit analysis book and I asked myself: do electrical engineers use these theorems to get current and ...
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### What makes a circuit digital?

I've been trying to understand how a circuit becomes digital. I understand the different between an analog signal and a digital signal, but I don't see where digital circuits come from if all the ...
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### Why isn't a transformer a short circuit?

I'm a newbie with electronic components and I never fully understood why transformers, while essentially being a short-circuit from a wire perspective, don't act like short circuits (i.e. they don't ...
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### Physical changes caused by charge pump

Charge pumps are very cool circuits because they challenge my ideas about how voltage works. I'm very comfortable with the math behind line integrals, so to define "voltage" as the work done to move ...
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### Solving the equation for Common Drain

So I've designed an all NMOS amplifier to further voltage amplify the 5V max output of an Opamp to 24V rails. I used a Common Source at the very end so I'll have a very low output Impedance. Of course,...
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### Channel Coding with Higher modulation

Just had a theoretical question. I'm reading a book on LTE, and I came across an introductory section that talks about using higher modulation with channel coding. I understand that usually using ...
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### Inductance of toroidal-cylindrical inductor?

If the inductance of a solenoid is $L_{\text{sol}}=\frac{\mu N^2 A}{l}$ and the inductance of a toroid is $L_{\text{tor}}=\frac{\mu N^2 r^2}{D}$, is it correct to assume that the inductance of a "...
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### Circuit Impedance

What is the impedance of the following network? My textbook says $$Z = R_i + R + jwL + 1/jwC$$ But I can't seem to make that work.
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### How does cascoding helps

In order to improve the output impedance of a current mirror emitter resistance are added to them..but on the other way these emitter resistances have certain drawbacks which involve restricting ...
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### Why does output impedance behaves this way

Why does the output impedance(Ro) of a common emitter amplifier is considered in parallel with the collector resistance(Rc)...as according to the KVL--->Vcc=IcRc+Vce+IeRe they seems to be in series......
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### How serial resistors actually reduce EMI?

I am recently working with a GSM based system, and there was this advice in the datasheet of the GSM module: 22Ω resistors should be connected in series between the module and the SIM card so as ...