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Questions tagged [phase-shift]

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21 views

BEMF and zero crossing point detection

I am trying to control a BLDC motor without sensors using BEMF method and zero crossing detection. I managed to detect the zero crossing point but I am not sure if it is correct. I read that the hall ...
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1answer
35 views

Can AC voltage phase change across an SSR?

I got an SSR (Picker PCS15-D-240A-25ZL) to control a single phase 240VAC North American circuit going to a heating element on a homebrew setup. One of the load wires goes through the SSR and the other ...
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1answer
26 views

Handling Phase Shift with ANC

I've been working on a circuit to do active noise cancellation, but I'm worried about controlling the phase. Here are my assumptions, and I'd love some help understanding 1)what of my assumptions are ...
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2answers
79 views

Finding phase shift between the voltage and current

I am trying to find the phase shift \$\phi\$ of this circuit. I am using the formula: $$\phi = arctan{\frac{X_{L}-X_{C}}{R}}$$ Substituting in the values: $$\phi = \arctan{\frac{2000\Omega-4000\...
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2answers
93 views

Phase shifting with unity gain

I have come across about active all pass filters which provides phase shift with unity gain. I dont know this is the common practice in part of circuit design. For a fixed or variable unity gain ...
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0answers
42 views

Is a load bank always 3-phase or is a 4-phase possible?

I am designing a low voltage installation and the customer asked for a cell for a load bank. Now he drew this in 4-phase, but I did not encounter this before. Is this possible? I thought they were ...
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1answer
53 views

How can I match phase voltage between a transformer primary and secondary?

I am trying to make a circuit to transform 240VAC, split-phase to a 0 to 5V waveform for an Arduino ADC so I can measure the mains voltage. I have read this question (How to measure line voltage (220V)...
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1answer
79 views

Resolution of FRR Function

I am working with a oscilloscope GWINSTEK gds-2074a. As per the time resolution is concerned, turning the dial all the way down, it shows that it can go down to 1 ns. There is a Delay function in the ...
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2answers
102 views

How can I make a phase shift in an audio signal without changing the frequency response too much?

I have the following problem: I have two amplifiers, one is a mono amp for a subwoofer and the other is a stereo amp for two two-way speaker enclosures. The subwoofer and two-way enclosures have a ...
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0answers
31 views

Creating a 90 deg. circular polarized phased array using two Yagi

Imagine two 2.4Ghz Yagi (WiFi), one mounted with blades horizontal, the other's blades vertical, both aimed at the same target. Each has the same leg of its coax cable (Xmeasurement) longer (either ...
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0answers
23 views

Effect of impedance mismatch on phase of the signal

The effect of impedance mismatch on voltage measurement is known but is it possible for impedance mismatch between a oscilloscope and function generator to cause a phase difference? In my setup I have ...
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1answer
47 views

asymmetric signal split at SMA Tee (wires of different lengths)

I set up a circuit, as shown in the schematic below, to see firsthand how the signal paths of different lengths could lead to a phase difference. I am using an SMA Tee and there is no reason to ...
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1answer
117 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, ...
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6answers
182 views

How do I set my speakers out of phase?

A little bit of context: I'm doing a project for my physics class where I could choose the topic, and I chose to do phases in sound and noise cancellation (wavelengths and frequencies). Essentially, ...
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4answers
547 views

Why is there no Phase Shift in CC and CB Configuration

I am curious why in common base and common collector configurations there is no phase shift between output and input (at low frequencies, where stray capacitance doesn't "kick in" yet)? I get it why ...
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1answer
170 views

Can someone help me understand this transistor circuit?

I believe the purpose of this circuit is to perform SQ decoding. It is supposed to shift the phase 90 from 100Hz to 10Khz. I'm interested in listening to the quad version of the Pink Floyd Animals LP, ...
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1answer
124 views

Measuring phase shift between current and voltage with microcontroller

I am trying to understand how this design is used to measure phase shift between current and voltage of an AC signal. From my understand there should be a PWM signal generated on the output. Resistors ...
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2answers
94 views

Is there a circuit that can create dispersion?

I'm wondering if there's a circuit that would create dispersion effects. Essentially, I'd like to create a circuit which can do the following: Spread out a high frequency pulse. For example, put in a ...
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1answer
91 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 ...
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0answers
71 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 ...
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1answer
51 views

4th order (active) filter, I want constant phase shift band

I'm needing to improve an existing fourth order active filter design. The filter amplifies 10-100 kHz signals as desired, however the phase shift is causing problems. 10 kHz signals are phase shifted ...
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2answers
204 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 ...
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1answer
147 views

Log-Taper Variable Resistor from Linear-Taper

I'll start by saying: I've read quite a bit about how to make a "log taper potentiometer" using a resistor and linear-taper potentiometer, but I'm not sure if that will work in my case. I'm working ...
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0answers
69 views

Beam Steering range of a phased array antenna system

What is the beam steering range of a phased array dependent on? For example, if I use an antenna array of Nx1, with a phase shifter resolution of \$\frac{2\pi}{k}\$ and the antenna elements spaced at \...
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0answers
52 views

90 degree phase difference in current between inductors

The schematic is a circuit I am designing. The current through the leg with the inductor and capacitor in series must be 90 degrees offset from the other leg. The rectified current pulses through both ...
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0answers
59 views

Phase Shift Oscillator Feedback Gain

I'm having trouble getting to the result of the feedback gain (β) of the following phase shift oscillator: Is the circuit correctly designed? How do I calculate the feedback gain? Edit: Is it ...
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3answers
110 views

Do Quadrature and Bubba oscillators count as phase-shift oscillators?

I need this information for my school report. Do these oscillators count as phase-shift? I found some references here at the Texas Instruments website, but I'm not quite sure: https://www.ti.com/lit/...
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2answers
50 views

Finding phase angle of AC

After solving for a system of complex equations, I got the following currents: $$I1= -.80669-.35675j$$ $$I2= -1.8546+1.30730j$$ Firstly, I found the current magnitude: $$|I_1|=.88205A$$ $$|I_2|=2....
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5answers
2k views

90 Degree Phase shift at few MHz

I have a seemingly simple question but I've been doing a lot of searching and can't find an answer. What is a simple or standard way to achieve a 90 degree phase shift of an RF signal in the ...
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2answers
81 views

Help with identifying a transfer function - with neuroscience application

This is a question for you electrical network engineers. The problem has arisen in a neuroscience study I am working on, but I hope to be able to glean some insight from other domains that deal with ...
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2answers
339 views

Phase shift in an LCR circuit

In a capacitive circuit the voltage lags current by 90 degrees. In an inductive circuit voltage leads current by 90 degrees. In a resistive circuit voltage and current are in phase. If we have a ...
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1answer
107 views

Simplest phase-shifted gate drive for two mosfets

I have two inverters, driven by two IRF530 mosfets. I need to drive them with a specific phase shift. What is the simplest, most basic way to do it, for simple prototyping? (I am neglecting PWM ...
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2answers
435 views

Transfer function of phase change controlled with capacitance

We have an RLC series circuit with sinusoidal voltage source of frequency \$\omega\$. The normal transfer function of current to voltage is: $$ G(s) = \frac{I(s)}{V(s)} = \frac{1}{R+s L+ \frac{1}{s C}}...
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2answers
180 views

When finding impedance of an RC circuit, why do you multiply with -j and not j?

I understand the concept that the voltage lags behind the current in a capacitor, which is why we have to use imaginary numbers to find the impedance of a simple Series RC-circuit like this: Which ...
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2answers
492 views

Is an all-pass filter a linear phase shift filter?

Im in need of an application that needs to add linear phase shift to a signal similary to the one produced by a Bessel Filter, meaning constant delay, my question is: does a standard 1st order all ...
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2answers
159 views

Voltage controlled phase shifter?

I want to build a real-time phase error correction circuit to correct the phase degree error of a feedback loop to prevent oscillation. For this I need an electronically controlled phase shifter for ...
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1answer
144 views

CE BJT amplifier phase shift

I built simple CE amplifier in Multisim: and make AC analysis, the phase are: What is the reverse near 10 kHz? I make the identical circuit in LTSpice but there is no any equal to Multisim on phase ...
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0answers
129 views

Phase difference between two waves from wave equation

I need to calculate phase angle between $$i_1 = -4\sin(377t + 55) \hspace{0.2cm}\quad \mathrm{and}\quad \hspace{0.2cm} i_2 = 5\cos(377t - 65)$$ I need to determine which one is leading too. My ...
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2answers
430 views

Phase Shift in Audio Amplifier

I am trying to design a desktop audio amplifier, and I'd like to better understand the effects of phase shift on my output. I'm trying to design this amplifier to be of the highest quality I can, and ...
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1answer
5k views

Derivation of cutoff frequency and phase shift for RC low pass filter

I've been having some problems with how to find the cutoff frequency and the phase shift for a simple RC low pass filter circuit. I've read this post, but I need a better understanding of what ...
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1answer
276 views

Less than 180 phase shift in inverting amplifier

I'm simulating (click here) a standard BJT - CE inverting amplifier. However, as you can see in the plot, the phase shift between voltage at the resistor and signal voltage is very different from 180 ...
0
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1answer
219 views

RHP zero with a positive phase shift

All books and references I read say that RHP zero gives a negative phase shift. I can infer that by plot the phase of the function \$w_{z}-s\$ where \$w_{z}>0\$. With this function, when frequency ...
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1answer
85 views

Criteria for considering transmission line effects due to phase delay

Below drawing illustrates a transmission line where the source voltage is: Vs(t) = V0 x sin(ωt) After reading some texts about the subject, I concluded how to decide whether one must consider ...
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1answer
130 views

How to add a phase shifter to a Wien bridge oscillator

I need to add a variable phase shift circuit to my Wien Oscillator, I have done some research, but have only found phase shift oscillators made with 3 RC stages that generate a 180º shift. However, I ...
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1answer
59 views

Scattering parameters of a phase shifter

I connected a phase shifter to a VNA and measured S11 and S21. Upon setting the angle (phase) to a 100 degrees and measuring the phase of S11 I obtained the following graph, whereas theoretically S11=...
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0answers
74 views

Necessary phase shift of op amp

My lecturer said that, for any system where the amplitude response varies with frequency, such as for an op amp, there will necessarily be a frequency-dependent phase shift between the input and ...
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1answer
207 views

Low Pass Phase Shift Oscillator

I have come across this circuit configuration of an oscillator on a older metal detector. Searching around I have not been able to find any examples of a similar circuit in the wild. The output is ...
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1answer
143 views

How to double the amplitude of an AC Signal

If I have an input signal, \$v_{in} = A\sin(2 \pi ft)\$ where 1 < A < 4V and 20 < f < 20 kHz, and I am wanting to double the signal's amplitude so that my output then becomes \$v_{out} = ...
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2answers
403 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 ...
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1answer
131 views

Electricity Energy/Power measure with Different power factor

I am designing a circuit that measure the energy consumed from 50Hz AC supply (error must be < 1%), by measuring the voltage through potential divider; and current from shunt resistor. Then these ...