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Where is the phase shift on this oscillator?

I didn't think the oscillator below could work, but I built it, and it does: I used 10 uH for the inductor, 2.7 nF for the capacitor, and got oscillations around 8 MHz. The feedback loop is a series ...
SRobertJames's user avatar
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2 votes
0 answers
79 views

How does one find out if a multichannel digital oscilloscope is doing real time sampling?

By "real time" I mean the time interval between samples is not subject to jitter. Economies of hardware design may cut corners and allow asynchronous access to sample memory and other ...
James Bowery's user avatar
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0 answers
20 views

Adjusting shift phase of PWM dinamically does not work in STM32

I need to get two PWM signals (PWM1 and PWM2) from STM32F767 Nucleo board when programing with STM32CubeIDE, which are applied to a Full-Bridge DC-DC Converter. PWM2 must be shifted phase in reference ...
Jorge H's user avatar
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0 answers
34 views

Need help understand phase shift control in SPS dual active bridge converter

I am trying to understand the control scheme of the phase shift controller in a dual active bridge (DAB) converter. I initially started with the built in PLECS DAB converter and understood all the ...
Dalu's user avatar
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13 votes
3 answers
2k views

Why does a motor or ceiling fan exhibits low torque after capacitor-to-inductor swap?

For quite some time, I have been curious about what would happen if I replaced the capacitor in my ceiling fan with an inductor. Here in India, we usually deal with a mains voltage of about 220 - ...
15 Volts's user avatar
  • 707
0 votes
1 answer
93 views

Why is the real component in my amplifier input impedance negative?

I am designing an amplifier and the input impedance has a real component with a 180° phase shift. From what I understand, resistance can only be positive unless you are designing an oscillator. Here ...
the_circuit's user avatar
0 votes
0 answers
25 views

Current/Voltage phase shift issue with low/high capacitor capacitance

How to make voltage/current 90 degree phase shift properly? In my PWM->sine "converter" the current/voltage phase is shifted 90 degree only with low value capacitor (10 uF), but no shift ...
Vadim Ostanin's user avatar
0 votes
1 answer
89 views

How to find the phase values for the desired steering angle?

The picture attached is self-explanatory. The antenna system system 24 antenna elements with inter antenna element spacing of wavelength/2. There are two types of arrangements. The first one is ...
MGM's user avatar
  • 103
0 votes
2 answers
74 views

0 V across motor capacitor terminals, but resistance is 20 Ω. Is the capacitor dead?

It is a 36 μF, 440 VAC, 50 Hz rated motor running capacitor, used in a single-phase motor. AC source is 240 V, 50 Hz. The motor has stopping working. I want to know whether it is due to a faulty ...
Cinverse's user avatar
0 votes
1 answer
37 views

Phase shifting 2 waveforms to create a rotating magnetic field

I'm trying to set up a rotating magnetic field with 4 electromagnets coils (2 pairs) arranged around a fluidic cell. I have read that you need to shift the 2 waveforms out of phase by 90 degrees to ...
LeviB's user avatar
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1 vote
1 answer
49 views

Equivalent impedance for R-C configuration in op-amp input

If I have a circuit like this, how can I obtain the loop gain, since the capacitors and resistors are not either in series or parallel? If the feedback resistance is \$R_f\$, then I have something ...
ludicrous's user avatar
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0 votes
1 answer
62 views

Negative capacitance circuit without relaxation oscillations

Wikipedia gives the following circuit as a negative capacitance circuit: I was curious if I would be able to create a low-pass resistor-negative-capacitance filter, analogous to an RC low-pass filter,...
Math Keeps Me Busy's user avatar
0 votes
1 answer
167 views

What is the behaviour of this antenna array?

I have a subarray-based antenna system as shown here: The four subarrays are arranged vertically. In each subarray there are six antenna elements. Only the bottom three in each subarray have a common ...
MGM's user avatar
  • 103
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0 answers
37 views

PE44820 Phase Shifter Confusion in Results

I am using a PE44820 phase shifter for my capstone project. We created our own evaluation board so that we can test it with a raspberry pi3. We are running a simple test first where we are just trying ...
Alexandria Walker's user avatar
0 votes
1 answer
182 views

Why do inductors and capacitors cause phase shifts between current and voltage? [closed]

I am learning about grid level stabilization services. My native language is German and I am translating the specific terminology. If I use the English terms incorrectly please edit my below sentences....
Merlin Nestler's user avatar
2 votes
4 answers
851 views

How can I mathematically show that multiplication of j will cause a phase shift?

I have a simple question that I cannot seem to wrap my head around. let's say I have a function Asin(wt), if I multiply a '-j' by this function to get: -jAsin(w*t), I have been told that this is ...
Josh Girgis's user avatar
0 votes
1 answer
210 views

Op amp based phase inverter. Two examples. Which is best?

I'm a beginner in electronics. I've got a fun guitar pedal adventure going. Now I'm in need of phase shifting. I'm making a parallel effect mixer, and as some pedals are inverting the signal, I'd like ...
Jesper Kragh's user avatar
0 votes
2 answers
132 views

Instantaneous phase detection between two low frequency sine waves

I am looking for a non-microcontroller based solution for detecting the instantaneous phase change between two sine waves with frequency 25 Hz. I have tried using zero crossing detector, but I have to ...
gari's user avatar
  • 103
0 votes
1 answer
92 views

Analog circuit for obtaining a phase shift of 1-2 s in an arterial pulse wave signal of period 1-2 Hz

I am trying to design an analog circuit using an operational amplifier to introduce a phase lag of the order of 1-2 seconds in an arterial pulse wave signal (photoplethysmogram or PPG for short) that ...
Saif's user avatar
  • 1
0 votes
2 answers
151 views

Turns of inductor relation with phase shift

I have a question regarding the phase shift produced due to an inductor. I have seen some inductor coils that have only 2-3 turns on the core. Some have only one as shown below. It is known that an AC ...
kam1212's user avatar
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1 vote
1 answer
87 views

How to calculate capacitator voltage over time for a RC circuit with AC power source?

I know with DC power source, the voltage for capacitator is expressed as: https://www.electronics-tutorials.ws/rc/rc_1.html Can the same equation be applied to AC power source?
jjk's user avatar
  • 123
0 votes
2 answers
72 views

Define the expression by the waveform [closed]

Could you explain how to define the expression for the dead time \$\theta\$? $$f_{1}=\frac{2}{2\pi }\int_{\theta }^{\pi -\theta }{V}_{in}\sin(\omega t)d\omega t $$ $$f_{1}=-\frac{2{V}_\text{in}}{2\pi ...
Antel's user avatar
  • 53
2 votes
0 answers
96 views

Can DAB both step up and step down the output voltage in the same design?

I study this converter through these articles (1 , 2). Attached is the DAB model for LTSpice. I usually see these converters working in buck mode (input bus with constant voltage PFC, maximum output ...
Delta's user avatar
  • 535
0 votes
2 answers
785 views

Computing the phase shift of an RC phase shift oscillator

Consider this RC phase shift oscillator, taken from here: As described in this answer, the phase shifts shown in the image are actually incorrect: https://electronics.stackexchange.com/a/216308/5546 ...
gsgx's user avatar
  • 183
0 votes
0 answers
166 views

What is the maximum / minimum phase shift in the Dual Active Bridge converter?

Learning Dual Active Bridge Converter from this article. Recommended work area to achieve ZVS There is a formula for calculating phase shift limits Where M = N*Vout/Vin, N = 1.6 In the article, I ...
Delta's user avatar
  • 535
2 votes
1 answer
87 views

adjustable analog phase shifter [closed]

I am a student. I am preparing a project to measure 2 sine waves with different phase-shift. To calibrate my phase-shift measurement device, I need a fair accurate IC / device / product that the ...
WF CHAN's user avatar
  • 23
0 votes
0 answers
187 views

Reliability issues with si5351 when generating two clocks with a phase difference of 90 degree

I am trying to generate two clocks of X-MHz each, X being a value ranging from 5 to 100. I chose si5351 chip for this as a breakout board was easily available from Adafruit. I used attached code to ...
Ravi's user avatar
  • 9
0 votes
1 answer
36 views

Electrical line distance vs phase shift

The below screenshot is from TQP7M9104 page-8. Note 8 provides the constraints on the distance between components. If I am not wrong, this is for electrical line distance to control the phase offset. ...
enemra's user avatar
  • 81
2 votes
0 answers
46 views

How to minimize voltage-current phase shift in the output signal of a circuit?

So, I have this circuit (Fig. 1, LTSpice ASC file here: https://github.com/PauloCarvalhoRJ/Circuits/blob/main/driver_speaker_5W_RMS.asc) designed for small scale geology investigations (using sound ...
Paulo Carvalho's user avatar
3 votes
2 answers
394 views

Filter phase shift and causality

A filter I have is showing to have a positive phase shift of ~30° at 1 kHz: Also, it seems that the output signal is actually advanced by 30°. But we all know that this is impossible because of ...
c.leblanc's user avatar
  • 339
4 votes
2 answers
356 views

Parasitic oscillations for phase shift not equal to -180 degrees

From "Learning the Art of Electronics" by T. Hayes and P. Horowitz, Cambridge University Press (p. 360): As per above figure, the LF411 op-amp imposes a -90 degree phase shift on output ...
Frost's user avatar
  • 105
1 vote
4 answers
1k views

Transfer function of RC circuit and phase shift

recently I have been learning about oscillators and I need a little help with that. I am kind of a guy that likes deriving things and it helps me understand how the circuit itself behaves. The thing ...
tom_ger's user avatar
  • 63
0 votes
1 answer
100 views

DAC DDR Interface with Vivado and Zynq7000

i need to connect a dual-channel DAC (AD9117) to a Zynq 7000 FPGA. The DAC has a DDR Interface, on which the Data for Channel 1 is clocked on the rising edge and the data for channel 2 on the falling ...
dinocroc123's user avatar
0 votes
0 answers
70 views

Power meter integrated in a circuit

I am constructing an electronic circuit that requires a power meter with a voltage signal output that represents the changes in power in a resistive load. It is crucial that the phase of this signal ...
c.leblanc's user avatar
  • 339
4 votes
2 answers
298 views

Alternate between 0 and 180° shift at regular intervals for a sine source during a .tran operation on LTspice

Is it possible to alternate between a 0 and 180° shift at regular intervals (say every second) for a sine source in a circuit during a .tran operation in LTspice? (I need to see the reaction of my ...
c.leblanc's user avatar
  • 339
0 votes
0 answers
272 views

Analog phase shift/delay for PWM that keeps its duty cycle

I have a variable duty cycle PWM signal. Its frequency and duty cycle can change during the operation of the circuit. I want to apply a deliberate phase shift/delay to it. In terms of phase, the delay ...
tobalt's user avatar
  • 22.4k
0 votes
0 answers
223 views

How can I calculate RC circuit impedance and phase difference in parallel?

Most of articles on the web, define capacitor as ideal capacitor. I want calculate impedance and phase difference of this circuit with capacitor ESR. For example : simulate this circuit – ...
POPI's user avatar
  • 143
0 votes
0 answers
88 views

Is there a better way to digitally phase-control this triac?

This is a follow-up to a previous question which has a more detailed background of the problem I'm trying to solve. I've built a wireless remote controller for a model train I have that runs on ~18VAC ...
zstewart's user avatar
  • 121
1 vote
0 answers
25 views

Reconciling phase shift error of length-tuned structures in 81-86GHz I/Q direct down-converter ASIC with datasheet specifications

I'm watching a video on reverse engineering a GaAs 81-86GHz I/Q down-converter ASIC. The relevant section of the video for this question is 10 minutes onwards, but watching the video isn't necessary ...
Polynomial's user avatar
  • 10.8k
2 votes
1 answer
2k views

How can I properly convert two phase AC supply to three phase using capacitors?

I have an AC 3 phase delta connected submersible induction motor with specifications 440 V, 10.5 A, 5 HP, 2800 RPM which is already fitted with a 3 phase PF correcting capacitor in parallel. The ...
Samay L's user avatar
  • 21
0 votes
0 answers
43 views

Constellation diagram of an 8-PSK modulator with \$\cos(\omega _ct)\$ as reference oscillator [duplicate]

For the figure and problem below, is my 000 input plotted correctly and has the correct phase angle in my constellation diagram? The cos(ωct) is located on the positive x-axis since according to my ...
Wolfram's user avatar
  • 19
0 votes
1 answer
255 views

Why do I get the wrong phase shift?

I am trying to compare theory vs simulation values and it seems to be that there are differences. I am using Multisim to simulate a RLC circuit, the LC are in parallel and in series to the resistor. ...
Arcadius's user avatar
1 vote
1 answer
680 views

How to find phase shift from oscilloscope?

In university we are tasked to input a 10Vpp 50Hz signal, in a series RLC circuit. I’m having trouble understanding the difference between a positive and negative edge phase shifts on Agilent ...
Arcadius's user avatar
5 votes
1 answer
51 views

How can power factor be reliably estimated given the phase error in current sense transformers?

The majority of mains power sensing devices I've seen (both commercial products and ICs) utilise a current sensing transformer. Many of them also calculate or estimate power factor. However, the phase ...
Polynomial's user avatar
  • 10.8k
1 vote
1 answer
179 views

BJT phase shift oscillator

DC 5 V for input Three 10 nF capacitors One 2.2k resistor One 680k resistor Two 5.6k resistors My assignment is to make an oscillator using only the elements given above. This is the desired ...
Yooseong's user avatar
6 votes
5 answers
1k views

Why doesn't the bypass capacitor cause phase shift in this oscillator circuit?

I am trying to understand oscillator basics. I thought I already understood how a capacitor works, but I still get confused about it. This circuit is an RC phase shift oscillator. I understand that we ...
Darko's user avatar
  • 73
0 votes
1 answer
140 views

Zero-cross detection phase delay BLDC motor

Low-speed output: High-speed output: In the above circuit, output channel 1 (yellow) is a Hall signal and channel 2 (Green) is the ZCD output. There is a phase delay between channel 1 and channel 2 ...
anbu b's user avatar
  • 127
3 votes
3 answers
937 views

Phase shift oscillator: what is reducing loop gain and how does changing feedback resistor affect things?

I have simulated the following circuit in LTSpice: One can see that a stable sine wave with a peak of about 6.3 V is obtained, which has a frequency of 1 kHz (I calculated the RC network values to ...
Daniel Tork's user avatar
  • 1,418
1 vote
1 answer
126 views

Why does PSPice invert this AC current?

I'm running a simulation on a simple circuit in PSPice 9.1: This voltage supply is set to provide a 1V AC signal with a frequency of 60 Hz. As the load is only resistive, the current should not have ...
Astor Florida's user avatar
7 votes
4 answers
657 views

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 ...
ee_student's user avatar

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