The shape of a value (usually voltage) when graphed over time.
3
votes
2answers
125 views
What is the source of this shape on my USB eye diagram?
I have designed a USB device around an STM32F105. It is USB 2.0 Full Speed CDC device configured as a Virtual COM Port using ST's USB Library. It uses the STM32's built-in PHY, and runs at 12 Mbps.
...
0
votes
2answers
68 views
Anyway to avoid the startup delay on square wave generator (e.g. 555 astable) circuit?
In the classic 555 astable circuit the external capacitor charges to 2/3 of the Vcc (through R1 and R2) and then is discharged to 1/3 of Vcc (through R2) and then it continues to oscillate between 1/3 ...
0
votes
0answers
47 views
Peculiar voltage spikes in triangular waveform generator circuit
I recently made a triangular waveform generator circuit using LM324 op amp. But the output of the generator had some sort of periodic spikes in it. However I was able to suppress the spikes by ...
1
vote
3answers
120 views
Peak and RMS voltage for a sine wave
I only need help with part C). What I've done for part B) is square the wave, which makes Vpeak->V^2peak and the waveform in the negative region(under the period axis) become positive AND ...
0
votes
1answer
33 views
Quantifying white noise with a spectrum analyzer
The setup of my problem is as follows. I have an experiment in which I want to apply a noisy voltage with a white (flat) spectral density over a large frequency range, say 0 to 7 GHz for example. Not ...
1
vote
1answer
37 views
3-Phase Permanent Magnet Alternator with Regulator/Rectifier (SCR) Output Waveform
So I've been troubleshooting some electrical problems with a motorcycle charging system, and I need a little assistance understanding the output waveform:
Per an article (which I don't have enough ...
0
votes
2answers
75 views
Wave rectification
I'm just a bit confused about what is actually happening when a wave goes up and down. It's a graph of voltage vs. time, so therefore wouldn't that mean the voltage was going up and down constantly? ...
0
votes
1answer
61 views
Propagation Delay due to Ferrite Bead [closed]
When I pass a 33MHz 'Square Wave' through 3 ferrite beads connected in series, 742792606 (from Wurth), I see that the output wave turns 'Sine' in form. Also there is a delay as it propagates through ...
0
votes
0answers
12 views
PartSim - Not possible to view full waveform range
I would never normally ask something like this on here but have been struggling for a while.
I'm not sure if i'm missing something obvious but I have the circuit below. When the wire is disconnected ...
0
votes
1answer
33 views
Oscilloscope training resources
I would like to learn to use an oscilloscope properly. I used them a few times at school, but that was a long time ago and I've forgotten most of what I learned about their use.
I'm now working with ...
0
votes
0answers
26 views
Piezomotor control
I'm trying to control a piezomotor, here is his datasheet, and drive it with the TMC261, however I've read that a piezomotor requires a sinusoidal wave so an DAC in indispensable but also I've found ...
0
votes
2answers
29 views
Determining the inital phase of a waveform
How could I determine the initial phase of the following sinusoids with these parameters only ?
from what I can see , I know that B is leading C since the crest is behind the Y axis .. Therefore , ...
1
vote
1answer
223 views
How to generate sound in VHDL
I'm new to FPGA and VHDL. I'm working on lab practical and for the practical we were already given file that has an I2C codec and the basics for the codec registers were already done but I found the ...
3
votes
3answers
133 views
Could sawtooth waveform be optimal for transformer input?
All the transformer theory I have reviewed uses sinusoidal waveforms, and concludes that a true sinusoidal input is optimal. But I'm wondering whether a sawtooth waveform would actually be optimal in ...
1
vote
1answer
57 views
Weird noise waveform on signal line
I'm doing some electrode recordings and a large noise waveform keeps appearing on the oscilloscope (see pic attached). Interestingly the recording set-up functions just fine with a clearly ...
0
votes
2answers
28 views
Understanding the meaning of a waveform of an alternative current
Let's say we have a simple electronic circuit with an AC power source, a resistor and wire. If the AC source can produce this kind of electric current waveform
does the peaks of this waveform ...
1
vote
1answer
107 views
What circuit creates this waveform?
Hi :) I was wondering if I could have some help with figuring out what circuit would yield this waveform. I'm trying to make sure that 1 and 3 can only be high if 2 is high when they are triggered. ...
1
vote
2answers
40 views
OFDM instantaneous power variation
One disadvantage of OFDM is apparantly the high instantaneous power variations (see Wikipedia).
What causes this? I assume this is a problem of forming orthogonal waveforms since regular frequency ...
5
votes
1answer
777 views
Using Oscilloscope So That Nothing Blows Up
I want to see the input current waveform of an LED T8 18W. An EM ballast is purposely placed in series with the lamp. I don't have a power analyzer. What's available is a GDS-2102 oscilloscope. So I ...
-1
votes
1answer
24 views
Quartus Waveform File Representation
I have selected the inputs as 8 bit count values that increment over time. The 8 bit value should be parallel in and parallel out. But the bits are spaced over time. Can you please explain why the ...
0
votes
1answer
173 views
tunable Wave form generator design with op-amps Multisim
I need to simulate a waveform generator using Multisim. I used the design in this Link. the frequency is 1KHz.
It works fine but I need some modifications:
1. I need the peak to peak voltage(Vpp) to ...
0
votes
2answers
82 views
RC circuit with two capacitors
Figure out the Vout wave form of the following circuit: ( assume the name of the 9u capacitor to be C2 and not C1)
Is there any way to intuitively plot the waveform by understanding the behavior of ...
0
votes
4answers
161 views
Capacitors in parallel without resistance
For the following circuit, at time 0, the switch switches from A to B, figure out the voltage wave form at B.
The question I am concerned with is whether the voltage across the capacitors will ...
1
vote
1answer
90 views
Equation for the average power of a signal
I'm reading the book "Introduction to Electromagnetic Compatibility" by CR Paul, and in Chapter 3, I come across this equation for the average power in the waveform assuming a 50% duty cycle and ...
0
votes
0answers
21 views
Finding the expansion coefficients of a waveform
I'm reading the book "Introduction to Electromagnetic Compatibility" by CR Paul, and in Chapter 3, it talks about how to find the expansion coefficients of periodic signals, \$c_0\$ and \$c_n\$.
...
0
votes
1answer
50 views
Audio Circuit to Remove Vibrato while Preserving Word Detail
In music, vibrato describes the warble effect often added in by singers as they sing. I was trying to come up with a circuit to remove it from an audio signal, almost like a "vocal stabilizer" ...
1
vote
1answer
53 views
GSM/GPRS reach for Class 4 2W 900MHz/ Class 1 1W 1800Mhz
I'm studying differents GSM/GPRS modules and all of them have two operation modes depending the frecuency (900MHz and 1800Mhz). If I'm not wrong, for the same power higher frecuencies have a lower ...
-2
votes
1answer
65 views
DC to AC converter
I know there are lots of circuits that do this, but I need to design a circuit that has a DC input and a square wave output by using any of these components:
capacitors, inductors, OpAmps, resistors, ...
1
vote
0answers
145 views
Export Modelsim waveform as image from command-line
Is there a way to export Modelsim/VCS waveforms as images (png, jpeg or SVG)?
Currently the only method I know of is to fire up the simulator, run the simulation and then either do a Print Screen or ...
-4
votes
1answer
230 views
Does the Rigol DS1054Z have a “integrated 2 channel waveform generator”?
I'm seeing that this device lists, on Amazon, as having
"and integrated 2 channel waveform generator"
Does it have a waveform generator? And, if so what is the difference between a waveform ...
3
votes
1answer
62 views
Setting up the “Basic Bipolar Output Operation” connection on a DAC08 chip
I have an 8-bit waveform description coming from an FPGA into the DAC, and I want to read the analog output on an oscilloscope. I figured I should implement this setup found in page 11 of the data ...
0
votes
1answer
137 views
Generating a triangle wave oscillator
I am trying to generate a triangle oscillator > 40 KHz and Vp = 2 V using these two ICs. So far, I only get a flat line when testing on Proteus. I'd really appreciate some help with the expressions I ...
2
votes
1answer
159 views
What could cause a sawtooth waveform to have these gaps in between?
I'm having problems with these gaps in between the sawtooth waveforms produced by a free-running bootstrap ramp generator triggered by a schmitt trigger. Why are they occurring and how could I fix ...
2
votes
2answers
274 views
Why does the diode current waveform look like this in a full-wave rectifier?
The oscilloscope trace below shows the output waveforms for the diode current (yellow) and the load voltage (blue) for a single phase full-wave uncontrolled bridge rectifier. The load attached to the ...
2
votes
1answer
147 views
problem generating Triangle wave using DDS
I'm trying to generate several waves using a Mojo-V3 board, that has a Spartan-6. I use DDS method to generate the waves. The description of the hardware is in VHDL. At the output of the FPGA there is ...
0
votes
2answers
144 views
PIC18F14K50 with 8Mhz crystal and 50Hz PWM
I'm looking to generate between 50Hz to 150Hz square waves with a PIC18F14K50, which is running with an 8MHz external crystal (XT).
Apart reading an analogue value for the frequency from a pot and ...
-2
votes
1answer
68 views
Opamp with Caps
I am having an issue with the output of an opamp. Not sure its the opamp but also not sure what this circuit is doing.
simulate this circuit – Schematic created using CircuitLab
I ...
1
vote
2answers
167 views
Building a variable frequency magnetic pulser
I'm starting a little project that will run a square wave through a copper coil to make magnetic pulses. I imagine the project would be quite straight forward if I were a little more experienced with ...
1
vote
2answers
120 views
Understanding alternating current (sine wave) [closed]
I want to study the basics of propagating a periodic signal, i.e. sine waveform, which is a power signal.
Let us consider an alternating current and write its expression as
$$I(t) = I_m \sin(2\pi f ...
0
votes
2answers
317 views
How do you convert a changing input (square wave) into a single high signal?
I am designing a circuit which will output a square waveform for a specific duration of time (t) but I need to be able to read the square waveform using a processor so would like to turn the changing ...
0
votes
1answer
89 views
does biphasic wave mean current is bidirectional
does biphasic wave
mean current is going bidirectional in a circuit?
-2
votes
3answers
246 views
Sawtooth generator adjustable from 100MHz-500MHz
I need an easy circuit that will generate sawtooth waves at adjustable 100MHz-500MHz (preferably set by a resistor) from 0V going up to 5V. The waves themselves does not have to be perfectly linear, ...
0
votes
2answers
105 views
What makes an arbitrary waveform generator arbitrary?
Why are some signal or waveform generators called "Arbitrary Waveform Generators"? Am I misunderstanding the word arbitrary? This question is not necessarily about the word arbitrary but more about ...
0
votes
1answer
102 views
Unexpected sinusoidal wave at low voltage setting on oscilloscope?
I'm fairly new to electronics in general, and I'm learning to use an oscilloscope.
I have a 10X probe attached to a 1uF capacitor that is completely discharged. When I set the time interval on the ...
0
votes
2answers
56 views
Hi Drive MOSFET waveform for charge controller
I have designed a charge controller using the BQ24650 IC from Texas Instruments. Although I am outputting the correct voltage, the hi drive waveform is not the square-shaped waveform I was expecting.
...
0
votes
1answer
492 views
BLDC motor waveforms
I'm trying to drive a brushless motor (BLDC) with an ATMEGA328p
I use Timer0/1/2 to generate 3 different PWMs @ 62Khz.
First I tried (only absolute values)
$$A = \sin(T)$$
$$B = \sin\left(T + ...
2
votes
1answer
95 views
Waveform Clipper
I need help solving this circuit. It's supposed to be a waveform clipper and I already simulated it, however I want to know how the circuit works and so far I haven't been able to analyze it properly: ...
0
votes
2answers
171 views
How to boost (double voltage) a sawtooth generator
I have a circuit to drive, using a sawtooth generator, four varactor diodes (FC54).
These varactor diodes has the following specs:
from 2.5pF (at 15V) to 30pF (at 0V), but my sawtooth generator, based ...
1
vote
1answer
46 views
Stray Capacitance in my load waveform?
I have just taken this trace of my Loadwave form for PWM controlled halogen dimmer.
I was wondering if anyone could identify the cause of the transients below or above zero volts for each polarity. ...
1
vote
5answers
627 views
Generating a PWM ramp signal using logic gates
I have a microcontroller outputting a ramp signal on an I/O pin in PWM form. i.e. the duty cycle steadily increases from 0% to 100%, then drops to zero and repeats. After smoothing I end up with a ...
