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Questions tagged [phase]

The tag has no usage guidance.

0
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1answer
22 views

Generating square wave using NXP LPC1768?

I am reading a book that teaches about programming the LPC1768. I have the following exercise here: Using any digital output pin, write a program which outputs a square wave, by switching the output ...
2
votes
1answer
62 views

Odd voltage readings between phase-ground, phase-neutral, neutral-ground

Recently i tried gathering voltages from few AC outlets in my house. I got following readings using a dmm Phase-Ground = 398V-400V (should be around 240V) Phase-Neutral = 230 V Neutral-Ground= 210 V ...
1
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2answers
80 views

Circuit To Measure Phase difference

Is there any classical analog circuit to measure the phase difference between two analog signals ( especially sinusoidal signals )? I want to measure the phase difference between two sinusoid signals ...
1
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2answers
115 views

Run 1800 RPM motor at 3600 RPM

I have a 2”x72” belt grinder with a Brook Crompton bf4n.75-2 motor. It is connected to a Teco L510 VFD. Running here in the United States on 110v. My question is about turning up the RPMs sometimes ...
0
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1answer
35 views

Link between phase noise and linewidth for a oscillator?

I was googling for a formula to transform the dbc/Hz value given in data sheets for VNA, spectrum analyzers and VCO is often given in dBc/Hz with offset. Now looking up research papers about future ...
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2answers
58 views

Philicorda phase shifter vibrato circuit doesnt work

I have built this circuit in the online editor, but it doesn't seem to oscillate. My philicorda vibrato broke down and i want to repair it. It should convert 21V DC into a sine wave when i understand ...
0
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3answers
118 views

Calculate Angle for Triac Phase Control

Triac-based phase control of the mains power into resistive load. According to this post, https://www.physicsforums.com/threads/how-to-calculate-rms-voltage-from-triac-phase-angle.572668/#post-...
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0answers
36 views

Pulse skip modulation vs Phase cutting for AC inductive loads?

What is preferred and safe mode for controlling power to an Inductive AC load when driven by a Triac? I am using a microcontroller with zero crossing optocoupler to drive the control signal and the ...
0
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1answer
56 views

What is phase ripple and how is it measured?

Whilst reading up on phase response, I came across a reference to "phase ripple". Specifically, I was reading this article by Keysight, on phase measurements. From my understanding of the article, ...
0
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2answers
43 views

In a three phase choke, is the rated current per phase or for all 3 together?

In a 3-phase choke, for example here: https://katalog.we-online.de/pbs/datasheet/744839010400.pdf What is the current rating? For the inductance it says 3x10.5mH, so its 10.5mH in each phase and if I ...
0
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1answer
42 views

During the positive cycle of US AC MAINS Electricity is the secondary Voltage back EMF or in phase with the AC MAINS?

The Sine wave of AC Mains in the US starts at zero and increases to Vmax~169-Volts. in the beginning magnetic Flux Change is greatest as it is proportional to the slope of the AC Sine wave (which is ...
4
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1answer
301 views

What does actually the “unravel branch wrap” option do to the phase plot in LTspice?

Below two Bode plots are identical just that in the second one the option "unravel branch wrap" is unticked for the phase plot: What does this option do to the phase plot?
0
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1answer
24 views

How is Phase Shift of an Op-Amp calculated using Polar Coordinates

I have a textbook (Op-Amp: Characteristics & Applications by Robert G. Irvine, 1981) and its Frequency response chapter started by discussing the Internal LP filters between the Input Differential ...
1
vote
1answer
55 views

high side mosfet offset voltage in Phase shifted full bridge converter

I am working on phase shifted full bridge converter. The input voltage of it is 300 V. The issue is I am able to see offset voltage (shown in fig below) in the gate to source pulses during turn-off ...
0
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2answers
51 views

Matlab Three Phase System Model

I have a question regarding MATLAB Simulink if anyone is familiar with the software. I usually have no problems creating basic models like this one below: I know the image is rather small. It is ...
1
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0answers
19 views

Hook up an automatic transfer switch with two phases only

We have a house in Haiti connected to the shore line. The shore line isn't always working so we bought a generator. I wanted to ground one of the two phases to create one neutral, one phase and a ...
0
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2answers
90 views

Bode Phase Plot of RC High-Pass Filter

I have been trying to understand Bode Phase Plot of RC High pass filter. I know that from my engineering that voltage lags behind the current passing through the ...
0
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1answer
55 views

Is there an analog circuit or filter that can produce constant phase shift over a specific bandwidth?

I need to match the phase of two signals coming from a pair of transducers over the 10Hz to 4 KHz range, the difference between the two transducers is really close, however one of the transducer lags ...
0
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1answer
53 views

what would be the function of a resistor 36,000 ohms across leads on non polarized electrolytic capacitors in a roto phase phase converter

I have a surface grinder (3 phase) and believe that some of the capacitors are shot in my phase converter due to a lack of available surge power. The grinder starts and works ok but the circuit board ...
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0answers
48 views

Impedance magnitude and phase error - Mathematical formula

Today I read a paper on which there are the terms magnitude error and phase error relative to a comparison between measurements performed with a biosensor and with a benchtop electrochemical impedance ...
1
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0answers
51 views

Physical significance of positive group delay with negative phase delay

This question is an addendum to: Is group delay the same as the delay of a certain frequency? Lately, I've been going back to basics to better understand the concepts of group and phase delay, so I ...
1
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2answers
133 views

PA92 OPAMP phase compensation

I'm having trouble to understand the phase compensation on the PA92 opamp. First I'll explain quickly the circuit I'm building.   1.  The circuit I'm using a 200V battery and would like ...
2
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2answers
138 views

Is group delay the same as the delay of a certain frequency?

I know that group delay is the delay of the envelope, or the derivative of the phase with respect to \$\omega\$. What I want to know is what exactly happens in the time domain. For instance take the ...
1
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2answers
165 views

noobie question on 3 phase [closed]

i am renovating a house and the electrician has installed all new wiring ,circuit switches, outlets etc... so now the electric company has asked if i want 1 or 3 phase. I told them 3 phase and ...
0
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0answers
24 views

How can a common phase error cause a linear phase drift?

I have a set of channel measurements, a set of raw data and processing files, which perform the synchronizations and also remove the common phase error. The effect i observed, when i removed the ...
0
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1answer
79 views

IEEE 1588 PTP phase and time synchronization

Why everywhere is said that PTP synchronize phase and time together? phase and time are totally separate concepts. does it mean after using PTP rising edge of slave and master clocks happen ...
2
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2answers
66 views

Understanding Working of High-Pass RC Filter

I was trying to visualize what happens when frequency is swept from 1Hz to 1GHz. In case of capacitor, voltage lags behind current by 90 degree and capacitor reactance depends upon it's frequency. I ...
0
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2answers
228 views

Calculating Phase/Time Delay induced by a 2-pole Bandpass filter? ie. Group Delay?

If you have a two-pole Butterworth bandpass filter described by a particular Q value (Q>0.5) and a resonant center frequency "f", is there any equation that will tell you the phase/time delay induced ...
0
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2answers
244 views

Why are so many wires coming out from a 3-phase transformer?

I want to make an arc welder from this stripped transformer. As far as I know it is a 3 phase transformer that could transform 380V to 12,24,40. I know how a regular 2 coil transformer works, but I ...
2
votes
2answers
97 views

Power to the home in the UK

We have a question about the power available to the home in the UK. Our product draws a fair amount of current, so we have (so far) designed it to be powered by ~230vac single phase at 48A OR ~230vac ...
0
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0answers
37 views

Phase modulation and intermodulation anomaly **plots attached**

I have a MATLAB script for modelling a two tone signal (a sum of two sinusoids) going through a non linear transfer function (such as an amplifier). The amplitude of a signal is amplified non linearly,...
0
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0answers
111 views

Trying to obtain phase angle using AD 8302 phase detector chip

I am trying to use the AD 8302 phase detector chip to obtain phase angle between antenna's receiving a RF signal due to the vertical separation of the antennas. I want to use the phase angle to ...
1
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3answers
122 views

Phase Difference Between Two Signals (Problem)

I am asked to calculate the phase difference between the two signals below. $$i_1 = -4\sin(377t + 55^\circ) \hspace{0.2cm}\quad \mathrm{and}\quad \hspace{0.2cm} i_2 = 5\cos(377t - 65^\circ)$$ What I ...
0
votes
1answer
182 views

Linear and non linear phase FIR filter

I am a confused about linear and non linear fir filter. I have this depiction of the solution space for linear-phase and nonlinear-phase FIR filters for a given set of specifications. Region 1 ...
1
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1answer
60 views

Circuit for detecting signal inversion

I am using two inductors on both sides of an ac carrying straight wire and want to detect their proximity from the wire. The coils are a set distance apart and move together laterally via mechanical ...
0
votes
1answer
30 views

How do I know the polarity of the resultant voltage of these two series-connected alternating voltage sources?

I was studying simple vector addition on All About Circuits, and the polarity assigned to the resultant voltage (see picture below) confused me. Link: https://www.allaboutcircuits.com/textbook/...
0
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1answer
209 views

How to find the phase spectrum of a rectangular pulse? (Fourier Transform)

How to find the phase spectrum of a rectangular pulse? The Fourier transform of a rectangular pulse $$ x(t) = \begin{cases} 1, & \text{for $|t| \le \tau /2$ } \\ 0, & \text{otherwise} \end{...
3
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2answers
409 views

Understanding Phase frequency detector logic

I have one of these common digital phase lock loops which compares the frequency and phase with a VCO (local oscillator) via a phase lock loop. I failed to understand why Figure (2) (A) and Figure (2)(...
0
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0answers
600 views

Phase angle in a ltspice AC network

With LTspice I simulate the circuit you can find in the image. I simulate and measure the differential voltage on the nodes around the inductor and R2. This simulates a bode-plot (you can find an ...
2
votes
2answers
360 views

Make FTDI 2232D do SPI mode 1 properly? Data seems 1/2 clock cycle off

This capture by a Saleae Logic Pro 8 (v 1.2.18) shows the result of transmitting (MOSI data) 0x20 0x11. Unfortunately it is interpreted and shown as ...
0
votes
1answer
372 views

lock-in amplifier (AD630)

I ve got a signal that consists of 2 square waves at 2 different frequencies at the kHz range, about 10 Hz apart.I need to determine the relative amplitudes of 2 different known frequencies and I was ...
1
vote
1answer
100 views

Transfer function of a digital phase frequency detector

I'm confused about the transfer function of a digital phase frequency detector. Why can we say that the pfd output is proportional to the phase error? The pfd (with charge pump) generates current ...
0
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2answers
119 views

Measure phase difference with less than a full wave?

I am interested in aircraft altitude measurement during approach. Off the shelf sonar doesn't provide enough distance, and inexpensive radio sensors don't provide a short enough distance. I have seen ...
0
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2answers
111 views

Low Noise Amplifier and Input/Output Phase

I've been designing LNAs for a brief time and I was wondering why the input and output phases is usually never cared for or measured when measuring the specs of the LNA. For example, the only specs we ...
0
votes
0answers
95 views

How to specify the correct phase shift of special transfer functions ?

I know how to construct the Bode diagrams of first order and seconde order(Complexe conjugate) transfer functions. But here in the two examples below i confront some difficulties. I hope someone can ...
0
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0answers
50 views

The reason that gain and phase are all constant

Here is a cascode amp by p686,Baker's CMOS Circuit Design,Layout,and simulation.The size of MOS are the same as this book,and \$R_s\$=100k and \$C_L\$=100p ,are from p687,ex21.12. So only VDD,3.3v, ...
0
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1answer
45 views

Phase-frequency detector not used in a PLL

My application: I need to output a voltage based on a phase difference between two input signals (a voltage and a current). It seems that a phase-frequency detector will do exactly this but I have ...
1
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2answers
249 views

What is the purpose of these elements in this circuit?

I am analyzing this continuous waveform amplifier circuit for a Microwave Motion Sensor. This high gain amplifier is recommended in the datasheet as the signal output of the sensor is extremely small (...
0
votes
1answer
104 views

Phase-modulated Noise

If you replace the carrier signal in a phase modulated circuit with noise then presumably the noise will be modulated. What must be considered if we wish to detect this noise modulation? I’ve ...
1
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2answers
278 views

Can I rewire a 240 V 3 phase steamer to a 240 V 1-2 phase?

I have this steamer unit that came in as 240 V, 3 phase that I am trying to adapt to a 1 (2) phase household. The unit needs 60 A and generate 9 kW. As per the manufacturer, and the below diagrams, I ...