# Questions tagged [analysis]

Questions attempting to analyze the mathematical properties of a formula, the inner workings of a protocol, or the design of a given circuit.

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2answers
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### Cross section of ceramic capacitors

I am trying to make a fault analysis of a bunch of ceramic capacitors. Short description of the application: 10 220 µF ceramic capacitors 1210 package are placed in parallel with a 3.6 V battery. A ...
5answers
4k views

### Puzzled by Nyquist frequency

Say I have a 1kHz sine, so no higher harmonics, then I need to sample it at least at 2kHz to be able to reconstruct it. But if I sample at 2kHz, but all my samples are on the zero-crossing, then my ...
3answers
38k views

### What's the difference between MOSFETs and BJTs (from a circuit analysis perspective)?

When analyzing circuits with transistors in them, when does it make a difference whether they are MOSFETs or BJTs?
7answers
3k views

### Differentiating between a square wave or sawtooth wave with a circuit…?

I want to build a simple sensor that takes a 100 kHz square or sawtooth wave with a known amplitude and outputs a high if it receives a square wave or a low for sawtooth. I'm pretty sure this ...
1answer
196 views

### What happened to all of the Dynamic Signal Analyzers?

Decades back there were at least half a dozen instrumentation companies offering Dynamic Signal Analyzers (DSA's). Not Spectrum Analyzers, but rather Dynamic Signal Analyzers. The main differences ...
1answer
1k views

### Why does this circuit oscillate?

The circuit below is an oscillator. When I simulate it with ltspice, it does indeed generate a waveform (although it doesn't seem to be a very pure sine wave). What I fail to understand is why it ...
2answers
4k views

### How to analyze this diode circuit?

I am trying to analyze this simple diode circuit by hand, but I can't seem to get too far. simulate this circuit – Schematic created using CircuitLab Using circuit lab, it is evident that ...
8answers
2k views

### Engineering Electronics: which approximation is usually good enough?

I have a strong computational background, so approximations with floating point precision depend on the type of computation. One thing is to know how to make an approximation and another one is when ...
5answers
4k views

### Predicting thermal equilibrium: what's wrong with my time constant?

I understand that this is arguably a peripheral electronics problem, but it seemed to fit here better than in physics. I've been doing some power electronics design work with large IGBTs mounted on ...
6answers
559 views

### Reading a circuit

Disclaimer: I am a beginner. I am reading a knol book on electronics, and I am faced with this schematics: How do I read a circuit to understand what it does ? Do I have to imagine the electrons ...
1answer
2k views

### Type 2 compensation network

I'm working through the excellent text on SMPS design "Switching Power Supplies A to Z", by Sanjaya Maniktala. Right now I'm reading the section on the feedback loop and stabilization. As a first-...
3answers
427 views

### Proper assignations of current directions

What is the best way to know the proper direction of current? Lets say we have this circuit below: The correct directions are given below: What are your techniques to know which is the proper way? ...
2answers
686 views

### Frequency response - finding transfer function

I have a this circuit: I am asked to find |H($\omega$)| in its simplest form. I approached the problem by first recognizing that the first op am was a standard inverter. With that I basically ...
1answer
246 views

### What's wrong with my boost converter math?

I'm working some equations for a boost converter, and running into a contradiction I don't understand. Assume a steady state, perfect efficiency, and continuous conduction. Total instantaneous energy ...
2answers
333 views

### Voltage divider ambiguity

considering the following circuit : ...
2answers
747 views

### Analyzing the Protocol

I am trying to understand a protocol (shown in figure 1) . For now this I have understood that data is transferred at high to low clock. as shown in figure. and the sync is for every 8-bit. But then ...
3answers
621 views

### Time-series Statistical Analysis with FPGA

Suppose I have two time series, such as stock valuations or radioactive diagnosis, for which I need things such as covariances (QP -problem) among other things. Covariance calculations should be easy ...
5answers
649 views

### Assistance with CMOS simulation

It's been a very long time since I took intro level EE courses. I'm working on a hobby project and as a refresher I figured I would simulate a CMOS inverter. For the life of me I can't figure out why ...
2answers
4k views

### Why we use conjugate of current than the original phasor in the calculation of Complex Power i-e S=VI*

i have studied different books and sites for the above question but did not get the right concept that why the complex power encounter current conjugate not the original Phasor.if someone explain it ...
3answers
177 views

2answers
521 views

### Sniffing USB traffic at the hardware level

I've been looking to purchase a USB sniffer that will parse packets at the hardware level. I've used usbsnoopy and the like, but a filter driver solution is not my ...
2answers
2k views

### Calculating an R-RC circuit

This is not homework. I have this circuit, and I want to calculate V2. I know it is equal to V1 at t=0, and equal to $V1 \cdot \frac{R2}{R1+R2}$ at t=$\infty$, but I don't know how to calculate ...
6answers
293 views

### Calculating Voltage

I am trying to calculate the voltage $Vw$ of the following circuit: I have little experience with these kind of problems, so I tried to solve first a more simple circuit that did not include the R2-...
2answers
881 views

### Identifying an irreducible circuit?

How would you go about identifying an irreducible circuit? By irreducible, I mean combining resistors whether in series or in parallel to reduce the circuit.
3answers
309 views

### Thevenin analysis

I have a hard time understanding why Thevenin analysis works. I can see the math, and I can find the equivalent resistor, but I am not sure why it is a valid analysis from a practical point of view. ...
1answer
1k views

### How do I find out which current/voltage to use for an unlabelled LED panel?

I have a 600mm x 600mm LED panel with 576pcs 3014-type SMD LEDs in some unknown configuration/topology (edge-lit, similar to this one here: http://i01.i.aliimg.com/wsphoto/v0/1990066259_5/Wholesale-...
3answers
2k views

### Nodal analysis for current controlled current source

Okay here I go. I just started learning nodal analysis technique but I feel its difficult in solving the circuits consisting of dependent current and voltage sources. Im unable to solve this circuit. ...
1answer
14k views

### How do I decide which method to use in circuit analysis?

I'm an Electrical Engineering student, and circuit analysis can be really confusing to me. I sort of understand the concepts of solving circuits, but I don't really know when to use which method. Are ...
1answer
1k views

### How to calculate equivalent resistance?

This is not homework. Imagine an infinite resistor grid which the picture shows a part of. The question is what's the resistance measured across any of the 1k$\Omega$ resistors. I don't want you ...
2answers
814 views

### DC analysis of common source MOSFET circuits to find gate voltage using different power supplies

simulate this circuit – Schematic created using CircuitLab strong text I am solving problems on DC analysis of MOSFET circuits. We are supposed to find various parameters like Id(Drain Current)...
3answers
2k views

### Poles in electrical engineering

I'm currently an undergraduate electrical engineering student who recently took an elective mathematical course on complex analysis, where we learned about all kinds of singularities for complex ...
2answers
6k views

### How to solve a transient circuit

Given this circuit considering that before the switch closes the network is in a steady state. What steps should one follow to trace $V_{L1}$ before and after the closing of the circuit ? As far ...
1answer
231 views

### equivalent load resistance

I have the following circuit I am having some trouble determining the relationships between Iac, Io and Iacpk. I'm not quite seeing how the final equation for Iac was determined, specifically ...
1answer
2k views

### How do I treat a PMOS compared to an NMOS in small-signal analysis?

What exhaustive list can I use to determine the differences between NMOS and PMOS devices when doing small-signal analysis? Equivalently, what are the fundamental differences between NMOS and PMOS ...
2answers
6k views

### Supermesh Analysis of circuit of two loops

I have am having trouble moving forward with the following problem. The problem says that Find the value of Vs in the circuit below such that the power supplied by the current source is 0. The final ...
2answers
1k views

### Av for small signal analysis with BJT for unbypassed emitter and ro in place

My question is about another question on this site. On that question Z(in) for small signal analysis with BJT for unbypassed emitter and r0 in place Zin is asked for a common emitter configuration ...
2answers
1k views

### Common gate amplifier with load connected to negative DC bias

What's the difference between the following two circuits? Note that the capacitors are DC blocking, and the FET is on. I understand that usually, the load is connected to ground. But what would ...
3answers
503 views

### Thought Process on Designing Circuits

I'm currently in my second year of computer engineering. I've taken circuit analysis courses and have a good general understanding of components, and a little bit of digital design, however, I'm very ...