# Questions tagged [phase]

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53 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 ...
37 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 ...
34 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 ...
132 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 ...
57 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 ...
62 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 ...
68 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 ...
57 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 ...
24 views

### Arduino Due PWM Burst Signal with Phase shift

Perhaps someone can advise how to properly handle the case on Arduino Due when I need to generate Burst PWM signal relative to the master signal. For example there is a master channel with a frequency ...
73 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 ...
97 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 ...
75 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 ...
110 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. ...
29 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 ...
40 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 ...
50 views

### Buck-Boost Transformer with Three Phase Wiring

I live in a residence with 120v / 208v electrical service. (Measured as leg1: 124v, leg2: 125v, 215v across legs) I am nearly certain that the service is the result of two legs of three phase power. ...
27 views

### Phase relationships in AC circuits

Is it wrong to use the mnemonics "ELI the ICE" [ From my understand means if its inductive current LAGS voltage and if its capacitive current LEADS] in understanding the phase relationship of a ...
30 views

### buffered Op-amplifier

I am trying to simulate a buffer with an op-amp using CMOS, I am using Cadence. The phase margin I am getting is negative (not stable) about -272 deg, I am trying to reach 50 deg for a gain of 86 and ...
79 views

### What is the gain margin of the system, when the phase crossover frequency does not exist?

I have a simple questions I have a system in which the system will never reach -180 degrees for any frequency. Does that make the gain margin infinite ? If yes, does that mean that the system will ...
47 views

### Need help in zero cross circuit by using op-amp

I worked on zero crossing circuit by using opto-coupler.Circuit is It is working okay.Zero_crossing signal is There is a 2-3 ms of signal loss is happening with 50Hz of AC signal.I don't want more ...
70 views

### Is the Kirchhoff's Current Law correct?

I'm on this problem: And I'm trying to use KCL to find Vth, my approach is: Am I on the right path regarding KCL? Thanks in advance!
57 views

### LTspice - Extracting magnitude of signal from AC analysis using .meas and the phase

I want to be able to produce a measure function such that the output of that function would give me the magnitude of a signal when its phase is -360deg. I tried using .meas AC name FIND mag(V(out)) ...
61 views

### What does 'passband phase' and 'stopband phase' mean?

I've been provided with a Bode plot for an RC filter circuit with a cutoff frequency of 10kHz. Im asked to find the stopband and passband phase from the graph. I'm confused how these can be just a ...
57 views

### How to find the phase of this transfer function?

I have been trying to find the phase of this transfer function: G(jω)H(jω)=0.1695/jω(5.88jω+1) by doing this: Phase = -arctan(0/0.1695)-arctan(w/-5.88*w^2) PHASE = 0-arctan(1/-5.88*w) Is this ...
44 views

### Does powering both phases (left/right rotation) of an AC motor hurt it?

I know that one can reverse the direction of an ac motor by powering the different starter windings. If you power one starter winding, you create a magnetic bias, allowing the motor to rotate to that ...
40 views

### Phase angle in a series RC circuit

I have a simple question from an electronics textbook (Electronics Fundamentals, Pearson, 8th Ed., p510 Q 37): 10V 10 Hz AC supply, 4.7K resistor and 10uF capacitor in series, with Vout measured over ...
126 views

### Why do four cascaded all-pass filters cause a 180° phase shift?

This op-amp all-pass filter is reported to introduce a 90° phase shift at the cutoff frequency of the RC network placed at the + input (the FET is used as a controlled variable resistor to move the ...
80 views

### Why are E and B field in phase in far-field electromagnetic wave propagation?

I am very frustrated with the fact that the E and B field of an EM wave are in phase in the far-field case. Before I get into this question I am letting you know that I already read this link related ...
31 views

### Multiplication of 2 waves in a phase detector of a phase-locked loop

What would be the product of a 60Hz square wave and a 60Hz sine wave with an approximate phase shift of -45 degrees? I could not find a proper solution to this anywhere.
56 views

### Phase Shift Power?

So I want to build a cheap AC-DC buck converter and I'm trying to eliminate parts by replacing them with "smart switching". So my idea is to ignore the capacitor which would smooth out the rectified ...
98 views

### Why 180 degrees of phase margin should be considered?

We've had one feedback on the phase difference, with the gain as 1. At 300 to 60 degrees, there's just a phase difference, and 61 to 299 degrees, the output is larger. Shouldn't we consider an angle ...
148 views

### Phase margin for a system (design of PD controller)

I have a system with the following transfer function: $G(s)=\cfrac{20}{s^2+s+20K_f}$ where $K_f=1.75$ I want to use a PD controller and I want obtain a phase margin of 35 degrees. I need to ...
27 views

### Based on $f(f) = \phi_{\beta} \; \land \; f(t) = |\beta_u|$ determine type of oscillator

Imagine the below characteristics of feedback circuit in sinewave oscillator are drawn: $$f(f) = \phi_{\beta}$$ $$f(t) = |\beta_u|$$ Based on the characteristics, how can I tell: Which type of an ...
114 views

### Understanding PLL VCO Integrator Phase-shift

In many PLL phase loop theory discussions, it's often said that the VCO acts as an integrator and therefore has a 90 degree phase shift. I've seen derivations of the VCO transfer function and this ...
104 views

### Phase Detector for PLL: Operation and Realization

I have some doubts about the realization and the operation of a phase detector for a PLL. My reference book is "The Design of CMOS Radio-Frequency Integrated Circuits" (Thomas H. Lee). The basic ...
98 views

### Is there any device for measuring phase and gain of a device in frequency range as low as 0.1 Hz?

I need to measure phase and gain of a circuit starting from 0.1 Hz to 10 MHz. Most of VNAs are for frequencies of several MHz to GHz. I've just found one VNA for 1 Hz. Is there a device or method to ...
40 views

### Three Phase Voltage Measurement

I have matrix rectifier.However, I want to measurement phase voltage by ADC during not rectifying matrix rectifier? Can I measurement phase voltage with passive rectifier?
63 views

### Four-phase power from one-phase?

I have four AC electromagnets that I want to drive 90 degrees out of phase with each other. I want this device to work on regular wall-socket power. I could drive two electromagnets 180 degrees out of ...
62 views

### Firing Triac strategy for motor phase control

I try to design a replacement potter's wheel motor controller for an old potter wheel. I have solve some problem and I am able to control the phase standard of filament light. Now I try my board on ...
53 views

### Phase Lead and phase Lag

I find the concept of phase lag and and lead quite confusing. Suppose we have two voltages $V(\theta) = V_{max} \cdot \sin(\theta + 30^o)$ and $V(\theta) = V_{max} \cdot \sin(\theta + 60^o)$ ...
178 views

### Does capacitor invert AC signal volatge

If the capacitor works by induction of charges, then does it invert an AC signal? (i.e phase shifting the input signal by 180 degrees). In my observation I dont see a phase shift between an input ...
57 views

### Simple Stability and Feedback

I have a question, my book says that for the system in this picture: If the system has G(s)*H(s) with a module of 1 (0dB) and a phase of -180°, the system is in Simple Stability, so it is like in ...
104 views

### Phase control circuit (U111B replacement) for AC motor

I try to repair an old potter's wheel electronic board based on "Phase control circuit" U111B. (An other U111B datasheet here) After changing 60% of components, the PCB is delaminate and I think it's ...
43 views

### Gain & Phase of a transfer function

can anyone help me calculate the gain and phase angle of the following transfer function for a low pass filter at a frequency of 130 rad s^-1: G=1/(1+jw/260)
105 views

### Phase difference between resistor and inductor voltage in an RL AC circuit

In my textbook, it is given that $\mathcal {E} = -L\frac{\Delta I}{\Delta t}$. The graph of resistor voltage ($V_R$) and inductor voltage ($V_L$) in a series RL AC circuit is given similar to ...
503 views

### Effect of Reversed Phase Polarity on Active & Reactive Power of 3-Phase System?

I am trying to investigate the Power/Energy of 3-Phase System under Different Faults. I have a Three Phase Source and Load, Load is balanced i.e same phase angle and current (Phase-Neutral V = 230 ...
58 views

### what does phase really mean?

I'm new to EE, and I am reading a text book which says: Phase describes the position of the waveform relative to time 0. The a quiz asks What is the phase shift for a sine wave with the maximum ...
95 views

### Phase detection with non-ideal PFD

I'm trying to simulate for Phase Frequency Detector with the following implementation: and inside NAND_PFD: NOTE: the triangles on the right are inverters and not amplifiers. I'm currently ...