Questions tagged [phase-shift]

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7 votes
4 answers
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Is my summary of parasitic oscillation in op-amps wrong?

We were discussing negative feedback in op-amps with my community college instructor. I tried to learn ahead about the concept of parasitic oscillations in feedback circuits. I wrote a summary of what ...
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0 votes
1 answer
73 views

Relation between number of RC networks and phase shift in RC phase shift oscillator

The generalized expression for the frequency of oscillations produced by a RC phase-shift oscillator is given by the formula below $$f=\frac1{2\pi RC\sqrt{2N}}.$$ Here \$N\$ is the number of RC ...
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1 vote
1 answer
37 views

Does a grid-connected induction generator create phase difference between the grid voltage and generated current?

I saw an answer to another question that stated: "An ordinary induction generator connected to a power grid will draw lagging reactive volt-amperes from the grid and supply real power to the grid....
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1 vote
3 answers
79 views

Making 2 clocks with phase shift

I'm trying to create 2 clocks with phase shift for 1/4 cycle time: ...
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0 votes
1 answer
50 views

Phase of grid current is not varying in the simple RL circuit

I am trying to implement the following circuit: Circuit parameters are as follows: R1 = 2 ohms L1 = 10mH V_inverter = 28.175V (peak) V_grid = 200V (peak) I want the grid current to vary in full ...
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0 votes
0 answers
39 views

Trying to Construct Phase Shift Circuit in Multisim

I'm attempting to construct the variable phase shift circuit from this video (link takes you to the circuit diagram of it) within Multisim. As far as I can tell the circuits are identical, and yet my ...
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2 votes
2 answers
105 views

Measuring relative phase of two microwave signals at different frequencies

I would like to measure, and ultimately control, the relative phase (and amplitude, but that's easier) of two microwave signals, one at \$f_0 \approx 1 \text{ GHz}\$ and one at \$f_n = n f_0\$, where \...
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  • 261
1 vote
1 answer
50 views

Will the phase shift be mutual if one phase is stepped down through isolated transformer and added to another phase?

i came across this concept of creating phase shift ( lagging and leading conditions) by adding a stepped down line voltage in series with a different phase voltage. I physically verified the concept ...
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2 votes
2 answers
535 views

Simulating a RC Phase-Shift Oscillator in LTspice

I'm having some difficulties in simulating this circuit in LTspice. I'm using op amps in the inverting configuration and buffers between each stage but it's simply not working. The simulation runs for ...
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0 votes
1 answer
87 views

Attempting to make a variable phase shift circuit

I'm attempting to construct the variable phase shift circuit from this video (link takes you to the circuit diagram of it) except that I am using a 1 uF capacitor in place of the .022 uF capacitor. I ...
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3 votes
1 answer
168 views

PSFB - Asymetric current at the secondary

At the 3rd step of the PSFB cycle, the current at the secondary is not shared equally by the two windings that it would be if it were a full bridge. Does anyone can explain why it is not the case ? ...
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  • 1,430
1 vote
1 answer
78 views

How does a phase shift keying receiver detect when a new incoming modulated signal is at the input?

This is not a math question. What I want to know is the physical implementation of the receiver where phase modulated signal is coming to the receiver. How does the receiver decide when the phase ...
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0 votes
1 answer
62 views

Phase angle of induced voltage in transformer?

Why does the voltage induced in the secondary coil of a transformer lag 90 degrees from the flux in the core? The secondary voltage is induced when the flux cuts it, but then, why does the induced ...
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2 votes
1 answer
51 views

Testing of HF transformer designed for phase shift full bridge converter(PSFB)

I have designed an HF transformer for a PSFB converter. Specs: Peak Primary Voltage = 800 V Peak Secondary Voltage = 176 V Turns ratio Np:Ns = 18:4 Primary Irms current = 12.38 A Secondary rms ...
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0 votes
1 answer
53 views

Phase cut dimming driver for panel lights having occasional flick

I am designing a phase-cut dimming driver for Incandescent bulbs as well as LED panel lights with dimmable drivers. Using a BTA24 Triac and VOT8121AB Optocoupler driven by my MCU. For zero-cross ...
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2 votes
3 answers
244 views

Phase difference between the input and midpoint of voltage divider? What can I do about this?

I am very shocked to see a phase difference between the input and the midpoint of voltage divider. The voltage divider for this circuitry is two 1Mohm in series. The input signal is powered by the ...
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  • 199
3 votes
1 answer
82 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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0 votes
3 answers
185 views

Limitations of op-amp phase shifter design

I want to implement a phase shifter using an op-amp, also known as active all-pass filter, according to this schematic: simulate this circuit – Schematic created using CircuitLab Formula for ...
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  • 91
0 votes
2 answers
105 views

Unexpected voltage shift in zero-crossing detector circuit

I have designed following circuit of a zero-crossing detector, which is supposed to amplify small sine wave signal and convert it to (digital) square wave. It uses one single supply op amp for ...
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  • 91
0 votes
2 answers
98 views

How to add a phase shift in the digital domain?

In digital beamforming, the phase shifting of a signal is done in digital domain. I am not sure about the solution that solves the problem by adding a delay to the input signal using as series of ...
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2 votes
2 answers
294 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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0 votes
1 answer
128 views

Phase shift oscillator frequency not stable

I've made a buffered RC phase shift oscillator. I have a problem with its frequency constantly rising. It is not oscillating around a value but rising. I've made a homemade PCB and I've used an ...
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  • 104
0 votes
3 answers
348 views

Op amp introduces phase shift at high audio frequencies

Context: I am trying to design a solid-state microphone preamp using dedicated audio op amps (ex: API 2520). Goals: flat ≈60-66dB of gain from 20Hz to 20Khz Limit changes in phase shift as much as ...
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  • 111
-1 votes
1 answer
89 views

Current with 150 degree phase shift and wiggle on single phase motor

So while I was trying to solve another problem on a different question, I found that my AC(Air Conditioner) Unit compressor waveforms were a bit confusing; As you can see on the scope view below there'...
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  • 99
0 votes
3 answers
1k views

180 degree AC phase shift using capacitors

Let's say that I have a high-frequency oscillator (350 GHz for instance). I would like to know, for the sake of my own learning, how to phase shift this signal by 180 degrees. Would having 2 caps in ...
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  • 183
-2 votes
1 answer
98 views

Dividing clock frequency and then phase shifting it [closed]

I have a 60MHz source clock. I need to create four 15MHz clocks aligned with the source clock, such that each next clock is phase shifted by 90 degrees from the previous one. How can I achieve this? ...
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0 votes
4 answers
604 views

How to interpret the S21 phase measured by LCA or VNA?

I have measured the S21 phase of my device, which came as below. I would like to know if this phase is with reference to the input or with reference to the DC?
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0 votes
0 answers
165 views

How can I measure phase shift in Multisim using Tektronix oscilloscope?

I have to measure the phase shift between input and output of amplifiers. Below is an example circut with voltage charts (yellow is input, blue is output.) How do I measure phase shift between them? I ...
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0 votes
1 answer
54 views

In a delta generator, will each phase voltage always be shifted 120°?

I'm confused by all the different phases and angles. Where I live we have a delta generator (3P3W) 230 V system. I was told that the three voltage phases will always be shifted 120° from each other... ...
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1 vote
1 answer
232 views

Explaination on phasor diagram for RL circuit?

This is the phasor diagram which I had drawn from the value of phase difference(deg) from MULTISIM. I'm a bit confuse here... shouldn't by theory, when inductance is increase, thus the degree for Vl ...
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0 votes
2 answers
85 views

Phase shift oscillator: confused about phase shift per stage?

I am just learning about the RC phase shift oscillator with 3 RC stages and an opamp. From what I've learned - each stage will introduce a phase shift of \$60^\circ\$ so the total phase shift will be \...
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0 votes
1 answer
275 views

Phase shift just with a logic gates

Is it possible to shift the signal phase in the digital domain without the use of a microcontroller, only with the help of logic gates? I would like to have control and, for example, use a ...
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0 votes
1 answer
126 views

Regarding transistor RC Phase Shift Oscillator

I have been recently studying about the transistor RC phase shift Oscillator. I calculated the attenuation provided by the RC network to be equal to 29. But when we use a transistor to make the ...
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  • 137
0 votes
1 answer
68 views

Synchro with 1 phase grounded

I have been doing some research into synchros and I know the base equations from to determine the voltage difference between phases. Those equations can be used to determine the angular position from ...
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2 votes
3 answers
151 views

Whats the justification to determine the phase sequence?

I have been told many times that one way to determinate the phase sequence of a three phase system is to use two resistances and one capacitor (or inductor) in star (wye) connection, then connect two ...
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  • 510
2 votes
3 answers
167 views

Phase shift in an active RC shifter

How can I find the phase shift as a function of \$R_1\$? I found online that the equation is \$\phi = −2\arctan(R_1/X_c)\$, I just can't figure out why the 2 is there. simulate this circuit – ...
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0 votes
0 answers
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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2 votes
2 answers
112 views

phase-shift oscillators

I'm starting to learn about phase-shift oscillators and I'm a little confused at the outset. Suppose you have an amplifier with a feedback circuit with transfer functions A and β respectively. My ...
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6 votes
3 answers
561 views

Is it possible to model a single-phase phase-shifting transformer in LTspice/Multisim/PSpice?

As you know, three-phase two-winding transformers can produce a phase-shift between the line-to-line or line-to-neutral phasor voltages of one side and the respective line-to-line or line-to-neutral ...
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  • 908
3 votes
1 answer
220 views

How does the resistance-capacitance oscillator shift voltage by 180 degrees?

I'm trying to wrap my head around how the resistance-capacitance oscillator shifts voltage by 180 degrees. As far as understand, a capacitor shifts phase for current, not voltage. What am I missing ...
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1 vote
1 answer
186 views

Generator synchronization to grid and angle difference

Following conditions are needed for generation synchronization : 1 Phase Sequence 2 Voltage Magnitude 3 Frequency 4 Phase Angle I have question about Phase angle assuming that the frequency is the ...
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  • 199
0 votes
1 answer
76 views

Phase-shift a Broadband Time-Domain Function

Suppose we have an operator \$A_\phi\$ which phase-shifts a sinusoid by \$\phi\$: $$A_\phi[\cos(\omega t)] = \cos(\omega t + \phi)$$ In phasor domain, \$A_\phi = e^{+j\phi}\$ is a complex constant. I ...
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  • 101
1 vote
2 answers
105 views

Relationship of complex load angle, voltage/current phase different and load factor

Question: Explain the relationship of the load impedance angle to the displacement coefficient cos(𝜑1) and the power factor λ at the input of the rectifier Not sure exactly what its asking for. It ...
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0 votes
1 answer
69 views

How to shift the phase (185 degrees) of the triangle waveform without a distortion?

I need to phase shift the input waveform exactly 185 degrees. Unfortunately, I can't find a good/simple way to do it. Thanks.
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1 vote
1 answer
512 views

AC zero Crossing detection with transformer

I am working on a circuit that requires zero crossing detection. I detected the zero crossings of the 230 Volt AC sine with the help of a full bridge rectifier and a 4N25 optocoupler with a pull up ...
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0 votes
1 answer
157 views

RC Phase Shift Oscillator Design

I am trying to build a phase shift RC circuit as shown below. I want the output frequency to be 100Khz at a 5V input and I want to be able to lower the output frequency as I lower the input voltage. ...
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0 votes
1 answer
213 views

Setting the cutoff frequency of an active bandpass filter (op amp) and finding the phase in LTSpice

I am doing an exercise and my op amp cutoff frequencies are: lower 1kHz, upper 10kHz. I have found the phase shift of the filter, but since the graph I get does not make much sense for me I think it ...
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0 votes
4 answers
77 views

Phase and voltage conversion

I have a hypothetical question in regards to phase conversion and transformers, more specifically on their combination. I am not a certified electrician or engineer, so I don't know what all goes into ...
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1 vote
3 answers
81 views

Analog method for measuring distinct phase shifts

I have a signal that undergoes distinct 90 degree phase shifts but has an unpredictable frequency over a predefined range (anywhere from DC to 300MHz). From my limited knowledge on PFDs, they can only ...
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0 votes
1 answer
50 views

possible CMOS techniques for altering the pulsewidth and phase shifting of a pair of complementary squarewave signals

My question is very simple in terms of input and output required. Following illustrations are for input and output: input signals are a pair of complementary signals operating under 1MHz of speed. ...
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