Questions tagged [phase]

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172 views

About power dissipation of capacitors and inductors & I-V phase difference

For instance, The Art of Electronics (by Horowitz & Hill) states that ideal capacitors cannot dissipate power, even though current can flow through them, because the voltage and current are 90° ...
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1answer
42 views

3 Phase Motor to DC Output

In a standard car alternator there is are 3 diodes that keep each of the phases from ever pulling electrons. There is then a capacitor to smoothens it all out. However how is it possible that the ...
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1answer
32 views

How to determine electric field polarity from electric field mill signal?

I have built an electric field mill like this, more info can be found in the (short) wiki article: It works by exposing the sensing electrode to the ambient electric field, which (depending on E ...
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3answers
83 views

Calculating peak period jitter from datasheet that lists phase noise

The oscillator I plan on using list phase noise for a 20MHZ signal as: (100Hz) -124 dBc/Hz (1kHz) -140 dBc/Hz (10kHz) -148 dBc/Hz 100kHz -155 dBc/Hz (1MHz) -157 dBc/...
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3answers
143 views

Does a product see any difference from being powered by a single phase 240 V European outlet versus 240 V from a split phase 240V (120/120) US outlet?

I have seen similar questions and the answers always move on to the physics of the transformer and a center tap. I get all that, I think. My question is whether sophisticated electronics (specifically ...
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2answers
249 views

Measuring relative phase of two clocks

I'm working on an FPGA and I have implemented a component that can take a clock and dynamically change the phase. Now I think there are some problems with this component because the target of the ...
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0answers
78 views

How to protect potentiometer in adjustable soldering iron?

I have an adjustable soldering iron and noticed that recently at some position of the adjustment potentiometer (R3 in the schematic below, this is the potentiometer ...
3
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1answer
64 views

Phase relationship of multiple Fractional-N PLLs with same reference clock

I think I understand the general operation of PLLs in the case where a single reference clock generates a single output clock. Once the PLL is locked, there is a deterministic relationship between the ...
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0answers
29 views

Multi carrier frequency conversion and phase noise

I have a oscillator with a phase noise mask that was represented in dBc at specific offsets from a carrier. Two options with a multicarrier signal going into a converter, apply the phase noise mask (...
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2answers
83 views

What happen if one connects two live phases together? [closed]

If a house is running on 1 phase wire and is flipping instantly or not stable for a short period as it drops from 200v to 170v and return back to 200v in 10 seconds. Would connecting another phase to ...
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1answer
38 views

Phase Difference Between dynamic voltage and input current

I have a RLC circuit, and I know if we wish to calculate the phase difference between Voltage and Input current then the formula is $$ \phi = \tan^{-1} \frac{X_L -X_C}{R} $$ But as we already know, ...
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3answers
91 views

AC circuit working principle

When a power source is AC (alternating current) one is a phase and the other is neutral. Does phase and neutral lines change their polarity over time or only phase line voltage and current up and down ...
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2answers
202 views

Is there a way to measure the Phase Shift between the input and the output voltages related by the equation: \$V_o = V_i(a+jb).\$? [closed]

Say \$V_i\$ is an input voltage, and the output voltage is given by \$V_o = V_i(a+jb).\$ Is there a way to measure the Phase Shift between these input and output voltages?
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23 views

How to implement this phase rotator

question 1, I think that we can use si,sq ,siq to control the phase move.In my understanding,in the Fig. 5. Phase rotator ,si, sq correspond to the values on the horizontal and vertical lines.siq ...
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3answers
545 views

About the torque-free charging operation

I and one of my friends are working on understanding the below context (paper link): The study provides an extensive overview of on-board integrated chargers for electric vehicles that are based on ...
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3answers
94 views

How did they get 240V from one leg (L1)?

A neighbor lost his L2 connection to his house. The symptoms were as expected. Fifty percent of the lights and outlets did not work and all his 240V appliances (AC, fryer) did not work. The utility ...
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1answer
44 views

In a delta wound 3-phase motor, how are the phase and line voltages equal?

After researching the 3 phase delta configuration, I'm confused as to how these three line-to-line and phase relationships can all be true. I have found the voltage/current relationships here , and ...
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2answers
155 views

Why do crystals have 0° phase shift at series resonance?

I am trying to understand the inner workings of crystal oscillators, but I do not understand why the current has 0° phase shift at series resonance. To my knowledge this is the equivalent circuit for ...
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0answers
30 views

LTspice .MEAS doesn't unravel branch wrap

When doing AC analysis in LTspice, there is an option to unravel branch wrap (i.e. phase un-wrapping). However, if we use .MEAS to find magnitude and phase, there is no option to unravel branch wrap, ...
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2answers
71 views

Pseudo Periodic Signal

I am reading a research paper Eyer 1999 in which they used these terms so I want to know about them since there is no source on which I can learn about these terms so that's why asking it here, it ...
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2answers
389 views

How to measure phase accurately using LTSpice?

I am trying, and failing, to measure phase in LTSpice. I've used the suggestion here ...
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2answers
46 views

What is the percentage modulation of phase modulation PM?

What is the percentage modulation of a phase modulation (PM)? Can you further explain and give detail? I am currently stuck in finding the information about this
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1answer
24 views

trigonometric expression in phased array

i have tried to develop the angles in the diagram bellow. there is not triangle where we have 90 degrees phi and theta together. why phi=90-theta ? Thanks.
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0answers
60 views

Underlying reasoning behind lead and lag nomenclature of compensation

If \$0<z, \;p\$, the Laplace transform transfer function \$\frac{s+z}{s+p}\$ constitute two distinct types of compensators. If we look at this schematic, \$0<z<p\$ (lead compensation) implies ...
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32 views

Why are complex valued zero and pole not used in lead or lag compensation design?

Consider the compensation transfer function \$\frac{s+z}{s+p}\$ so that the inequalities \$0<z<p\$ and \$0<p<z\$ correspond to lead and lag compensation respectively. It can be seen that ...
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1answer
196 views

Clock Phase Shift Not Working on FPGA

I have a project where I am using two clocks at the same frequency, with one having a -90 degree phase shift. The FPGA board I am using is an Nexys A7-100T configured with Vivado in VHDL. I have used ...
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2answers
69 views

Finding the kVA loading after improving the power factor

This is a homework question I've been attempting. But the answer I get doesn't match with whats given and I don't understand why my method is wrong. This is the question with answers. Here's what I'...
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0answers
75 views

Understanding Output From DFT

I should preface this by saying I'm a novice at all of this: I'm designing a system (using a stand-alone FPGA board combined with an ADC that offloads data to a GPU) that is supposed to look for high ...
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0answers
28 views

Usually AC quantities have the x-axis as time, but phase shifts are done in angles. How is there not a unit conflict?

This feels like a very specific and stupid question, but I have studied AC circuits for a while already. I just didn't think about it that much, but why is it established that the x-axis we use for ...
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2answers
395 views

How do I find the -3dB point on a given graph

I just performed an AC Simulation on QUCS and was asked to find values of gain and phase at low freq. and high freq and at the -3dB frequency point with the roll-off slope. The circuit is an RC ...
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1answer
169 views

Find the phase angle between two functions

Apologies if this is better suited for a mathematics forum, it's from my circuits textbook so I've decided to post here. Below is a practice problem from the textbook, with the provided solution. If ...
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1answer
67 views

What am I doing wrong in finding the phase angle of power?

Consider a voltage supply \$V\angle \phi_1\$ and a circut with impedance \$Z \angle \phi_2\$. Now the Apparent power(\$S\$) is given by: $$\bar S =\frac{(\bar V)^2} {\bar Z}$$ Thus phase angle of \$S\$...
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1answer
72 views

How to ensure signals from multiple different clocks are in phase?

I am designing a pcb where I have a signal of 10 MHz logic signal with 50% duty cycle that might be coming from different clocks. I will be using a pll frequency synthesizer to turn this into a 50% ...
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1answer
70 views

How do you find the phase lag of the current in this FM demodulation "discriminator" circuit?

I need some help understanding this discriminator circuit for FM demodulation. (L1, C1) is the primary LC tank which resonates with the carrier frequency, whose FM signal is applied at V12. As the FM ...
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2answers
410 views

Phase shift a square wave

I have an application where I would like to derive a secondary square wave from a primary one but with a continuously variable phase shift. I would like to know if this is possible to achieve in a ...
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0answers
31 views

Help needed for cis orcad + pspice

I have been trying to simulate a circuit on pspice. Simulation worked really well and pspice has given me the expected diagrams of gain and phase. I am having difficulty thought on how to use the ...
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2answers
95 views

How to graph sinusoid with phase angle

I am taking basic elec. circuits and I would like to know how to graph the wave forms with phase angles in either desmos, or octave or any other platform. I am not afraid of doing some coding for ...
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1answer
54 views

Suitability of standard-gain pyramidal horn for UWB signal

Objective I'm interested in evaluating the suitability of a standard-gain pyramidal horn for an ultrawideband (UWB) signal. However, I've had difficulty finding reliable information about the phase ...
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39 views

Traveling magnetic field

I'd like to do some experiments with a traveling magnetic field. To start with, I'd like to create a traveling magnetic field with a set of coils and try to propel an aluminum sheet. A basic model of ...
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2answers
147 views

Switching power line phases with inductive load

I have one question related to this schematic: Scenario: Source 1: AC source 220VAC, 50Hz, 120º Source 2: AC source 220VAC, 50Hz, 0º If I want to switch from source 1 to source 2 or from source 2 ...
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0answers
75 views

Two transistor pair inverter and one transistor pair inverter

Today I made DIY inverter (the top one) I managed to achieve ~2 volts from 5V usb, everything seemed to be ok. But I have question - is this the right way to make inverter? I also found the bottom ...
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3answers
72 views

Magnitude calculation of filter

I am working on a problem for a given transfer function given below and am having trouble calculating the magnitude and phase of it. The problem is specifically that I do not know what method to use ...
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2answers
106 views

How to add specific voltage offset to the "balanced phase splitter" op amp circuit?

I use the basic 2 opamps "balanced phase splitter" circuit to get 2 separate square wave outputs (0 and 180 phase). The input is 12Vpp but I need both outputs to be offset by -6V. So instead ...
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2answers
704 views

How do I find the phase of a transfer function in different ways?

Suppose there is a transfer function Now try to find the phase of this transfer function. The phase can be expressed in different forms: But each of these forms leads to a different result in the ...
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93 views

Why is Δt constant in phase shift measurement?

I would like to ask for some help with phase shift plotting. To be precise, with time delay between two waveforms. I am measuring two currents using an oscilloscope. channel A (blue) is my current ...
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2answers
222 views

How does an XOR phase difference detector behave when input frequencies are different?

How does an XOR phase difference detector such as AD8302 behave when input frequencies are different? Does it give meaningful results when the frequencies are close but different? Is there a simple ...
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1answer
83 views

Only detect the phase of a sinusoid multiplexed with other sinusoids of different frequencies

Is there an easy way to detect the phase of a sinusoid that has been added to other sinudoids of different frequencies (through a frequency-division scheme) without using a superheterodyne receiver ...
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2answers
1k views

LTspice three phase rectifier simulation

I am interested in creating from scratch a regulator rectifier for motorcycle. I struggle to comprehend the ground placement in the simulator. I cannot find instructions about tree phase simulation. ...
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1answer
71 views

Difference in phase response between circuit simulation and MATLAB

I have the following low pass filter: simulate this circuit – Schematic created using CircuitLab When simulating through Circuitlab, I get the following phase response (I think you should be ...
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0answers
43 views

Phase margin plot of LDO

For this LDO circuit design at https://github.com/promach/LDO/tree/development , 1) which exact circuit node(s) contributes to the zeroes near 1MHz after removing CL ? 2) If I remove "AC 1" from ...

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