Questions tagged [phase-shift]

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55 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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1answer
46 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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1answer
42 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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1answer
45 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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3answers
203 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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1answer
65 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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3answers
112 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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2answers
72 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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2answers
87 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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2answers
203 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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1answer
116 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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3answers
186 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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1answer
76 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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3answers
813 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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1answer
85 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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4answers
274 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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0answers
65 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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1answer
49 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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1answer
131 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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2answers
56 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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1answer
147 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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1answer
90 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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1answer
44 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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3answers
131 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 ...
2
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3answers
131 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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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 ...
2
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2answers
105 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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3answers
453 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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1answer
200 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 ...
1
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1answer
77 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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1answer
61 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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2answers
95 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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1answer
64 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.
1
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1answer
360 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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1answer
128 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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1answer
149 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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4answers
72 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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3answers
77 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 ...
0
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1answer
42 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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6answers
5k views

What is Capacitive Loading (Intuitive understanding)

I have read about capacitive loading. But what does it actually mean like intuitively? Just asked this question so as to get an intuitive answer and also know what should I understand when one says ...
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0answers
150 views

How do you calculate phase shift induced by a shunt capacitor?

Given a simple loaded-line shunt-capacitor phase shifter, how can I calculate the phase shift and insertion loss at S21 caused by the shunt capacitor (varicap in my case, but for any cap) assuming I ...
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2answers
302 views

Why is there no frequency compensation required in TI's TL494 example buck regulator design?

This example circuit is given in Texas Instrument's application note SLVA001: "Designing Switching Voltage Regulators With the TL494": They use a 140 μH inductor and a 220 μF electrolytic ...
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1answer
60 views

AM circuit LTspice

I have to analyze the following circuit and understand its function. As far as I understand the top part is the simple phase-shift oscillator generating output sine wave at circa 145kHz. The NE555 is ...
2
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1answer
113 views

L-C-L vs Pi network

I am playing with a simple high-pass phase shifter implemented as a Pi network in Sonnet Lite with a center of 146MHz and discovered something by accident that I would like to understand: By mistake, ...
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1answer
71 views

how to shifted phases in PWM with PIC18F4431

I am trying to design a driver for a BLDC motor. I have managed to generate 6 PWM signals with the PIC18F4431. But I don't know how I can shifted the phases. I attach my code and the image of the ...
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0answers
45 views

Analog phase shifting circuit

I have a high voltage(let's say +-100Vpp) sine signal of 500khz and i want this signal to be phase shifted(+ve) by 0, 90, 180 and 270 degrees. That is a circuit which has 500khz input signal and 4 ...
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1answer
102 views

How to calculate the total signal strength and phase shift of multiple signals in a reciever

I have a simulation to make where I have an array of transmitters that transmit the same signal. At a random point, which I have to consider as a receiver I have to measure the phase shift of the ...
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1answer
36 views

In a RCL circuit; where V_C > V_L is the phasor angle leading or lagging?

Is this example correct in stating that the phasor angle is leading by 38.323deg?
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3answers
3k views

How to calculate phase shift of a low-pass filter's output?

I'm simulating a basic low-pass RC filter in Proteus, and I need to find the phase shift of the output at varying frequencies. I've plotted a frequency response graph which shows the phase against ...
1
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0answers
52 views

Oscilloscope Phase Shift

I have a university research that i am conducting right now. My objective, as a first step, would be to phase shift an NRZ signal at high frequencies >40GHz, assuming this signal is already locked ...