Questions tagged [amplitude]

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Adding programmable amplitude control to an AD9833-based function generator

I'm working on making a function generator using the AD9833 DDS chip, but it doesn't have programmable amplitude control. I want to use external hardware to achieve this. My amplitude has to be 1 V to ...
zug's user avatar
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1 answer
135 views

Square wave only has a positive side, how do we move it to the middle so it has a positive and negative cycle?

We have a project to make a function generator that outputs a square, triangle, and sine wave. We have already made one, but there are several problem with it. The square output only has the positive ...
Beans Carlo's user avatar
0 votes
2 answers
103 views

Sinusoid Amplitude for an Ultrasonic Transducer

I want to design a driver for PKT40A from ThorLabs. The spec sheet indicates "Power (Typical, Instantaneous @ 3 kV)" of 700W, but the "Impedance at Resonant Frequency" of <12 ...
beardeadclown's user avatar
2 votes
2 answers
172 views

Peak detector working in two regimes

I measured the input and output of a peak detector and a very interesting pattern occured... I expected a single straight line but got two. Why is that so? Is it due to something else in the scheme ...
sasssu's user avatar
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Testing an IC : IO PAD experiences 2nd-order ramping effect

The IO is a regular PMOS-PULL-up and NMOS-PULL-dn IO with series resistors on pull-up and pull-dn branches. The IO is input an clock signal around 50MHz and it experiences an approximately 2nd-order ...
JohnLai's user avatar
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1 answer
49 views

How are discontinuities in quadrature modulated signal QAM physically produced?

In quadrature modulated signals, for instance: I am unclear how the "discontinuities" in the waveform at the junction of each data point can be physically produced? Taking a speaker as an ...
user323947's user avatar
4 votes
2 answers
450 views

The output amplitude of the C class amplifier I designed has a larger amplitude than the voltage source. How did this happen?

I designed a class C amplifier. I used a signal generator for the input signal. For the resonance circuit, I used a 3.3uH coil and a 480pF capacitor. The transistor is BC547-C. The resonance ...
OzGtZ t's user avatar
  • 105
2 votes
0 answers
65 views

Is there a single word term for doubled amplitude of square wave?

The IEC60050 (103-07-02) tells that the amplitude is "maximum value of a scalar sinusoidal quantity". So the peak-to-peak voltage is a doubled amplitude. Is there a single word term for a ...
Arseniy's user avatar
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1 answer
157 views

Trouble with VCA as signal amplitude control

I designed (and tested) the classic analog multiplier composed with operational amplifiers. However, the voltage resulting from the operation did not correspond to the product of the input voltages. ...
Borg Drone's user avatar
2 votes
2 answers
750 views

Amplitude vs Magnitude

Consider the relation between the output and input voltages: $$V_o=\frac{V_i}{2}(j-1)$$ where j is an imaginary number, and $$V_i=5sin(1000t)$$ Now, to find the amplitude of \$ V_o \$, should we look ...
Dom Tesilbirth Shira's user avatar
0 votes
1 answer
698 views

Is the peak to peak amplitude of a NTSC composite signal always the same?

I am currently trying to learn more about video signals. I'm particularly interested in NTSC since I live in North America. I recently bought an oscilloscope (Siglent SDS1104X-E) and I am trying to ...
Lexx32117's user avatar
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0 answers
49 views

Two lock in amplifiers, almost identical setup, different AC Gain?

I am measuring a voltage output of around ~110 uV for two thermometers. Other than the placement of the thermometers on the sample and the frequency of the lock ins (7225 DSP at 11.137 Hz, 13.373 Hz), ...
Laura's user avatar
  • 45
-1 votes
5 answers
626 views

Measuring the amplitude difference between two sine waves - to 20 bit accuracy

Two sine waves, same phase but different amplitudes. I need to measure the difference between the two amplitudes to one part in a million over about a one second interval. The most obvious solution ...
Dirk Bruere's user avatar
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1 answer
773 views

Average amplitude and DC component

While I read my college book in signals, I got stuck with some basics: DC component is component of zero frequency. With no DC component, a signal has an average amplitude of zero, with a DC ...
AhmedNour's user avatar
1 vote
1 answer
165 views

Amplitude detection

Why is second analog multiplier(marked with red color) used to detect the amplitude of the input signal in this circuit instead of diode? The point of this circuit is to maintain the output level of ...
Sundark12's user avatar
1 vote
2 answers
361 views

How to make a small amplifier, able to amplify a signal 2 × the input

I have a small device expecting a signal in the 8MHz range of 2V peak-to-peak. The output of my signal generator (or rather the device that outputs the modulated signal) is only at 1V peak to peak. ...
polemon's user avatar
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1 vote
3 answers
479 views

Is the amplitude of a sine wave increasing or decreasing in this phase?

I'm new to electrical signal, sorry if my question sounds dumb. Below is a picture from my text book: It says a sine wave with a phase of 0° starts at time 0 with a zero amplitude. The amplitude is ...
secondimage's user avatar
1 vote
1 answer
509 views

Amplitude influence in the output signal in inverting op-amp

I testing an inverting op amp circuit in LTspice. First I observed the graphic for the gain, and calculted the bandwidth of the circuit that is 11995Hz. Then I did a simulation at that frequency, and ...
Catarina Branco's user avatar
1 vote
1 answer
524 views

Relationship between harmonic's amplitude and square wave's Tr and Pw

I started reading this TI guide on high speed layout guidelines and had some question on the theory of clock signals (pages 2 and 3). From the image below it's clear that the amplitude of the first ...
Geo's user avatar
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Current Amplitude Distribution Lossless Transmission Line

I need to proof that the formula for Current Amplitude Distribution in a Lossless Transmission Line it's the following and I don't know where to start from... A little help would be appreciated. ...
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0 votes
1 answer
94 views

How is the amplitude of an output signal of a binary input determined using a constellation pattern?

I understand using the pattern to find the output line single phase but how is the amplitude determined?
Nexus_Valentine's user avatar
-1 votes
4 answers
1k views

Drawing Bode plot and the meaning of the amplitude and phase

I'm having trouble understanding how to infer from the transfer function amplitude how to draw the Bode plot. Given the following transfer function: Is the amplitude the slope of the graph? When I'm ...
E. Ginzburg's user avatar
0 votes
0 answers
41 views

SGEN amplitude measurement doesn't match oscilloscope

I don't understand the measurements regarding the voltage of the oscilloscope of the JDS6600 signal generator I recently bought. Being the SGEN specified amplitude 5V I'd expect the Vpp on the ...
perencia's user avatar
  • 234
2 votes
2 answers
186 views

Unit of ultrasound A-scans

I have a basic question concerning ultrasound A-scans. Such an A-scan might typically look as follows (source: https://img.medscapestatic.com/pi/meds/ckb/18/7418tn.jpg): I understand that the x-axis ...
Hagbard's user avatar
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1 vote
1 answer
1k views

Understanding function generator output when units are in dBm

I am using a function generator with output in units of dBm. It has an output impedance of 50 ohms. I am measuring this output on an oscilloscope, and am failing to understand the waveform's amplitude....
teddyv's user avatar
  • 11
0 votes
2 answers
230 views

Time Domain and Frequency Domain Amplitudes

I was wondering about these two graphs, the first is taken from an Oscilloscope and the second is taken from a Spectrum Analyzer. Why is the amplitude in the frequency domain close to 1/3 of that in ...
Garret Ulrich's user avatar
-2 votes
1 answer
3k views

LT spice: change amplitude of a voltage source over time in LTspice

I would like to have a sinusoidal voltage source that varies over time, for example; for time duration 1msec : 3v 13.56MHz for time duration 2msec : 10v 13.56MHz please help. i studied Help for ...
maryamshafighpour's user avatar
0 votes
3 answers
826 views

Convert -dB to equivalent +dB

I asked this question on stackoverflow and stackexchange mathematics, but on both sites my question was closed and suggested to ask here as mentioned in the comments to this question on mathematics. ...
Rouzbeh Zarandi's user avatar
0 votes
2 answers
1k views

How to automatically "normalise" a voltage signal in LTspice?

I would like to create an output signal that is normalised by the maximum value of a signal in LTspice. This is to produce a signal between [-1, 1] that is suitable for producing a wave file like ...
loudnoises's user avatar
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0 votes
3 answers
2k views

How to find the charging time of a capacitor given a frequency and an amplitude

In the circuit above, suppose the input pulse signal has an amplitude of 1V and a frequency of 1 kHz. The resistance is 56 kilo-ohms and the capacitance is 1 nF. So if I want to find the charging time,...
Vktr's user avatar
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1 vote
3 answers
2k views

High Frequency Rectification

I am trying to monitor an incoming signal and get some properties from it. The signal is a sine wave +-5V at 900Mhz. I am trying to measure the amplitude and the frequency of the signal. I will ...
Meozaa's user avatar
  • 91
0 votes
1 answer
11k views

AM Modulator with BJT 2N3904

I created an AM modulator circuit with BJT 2N3904 for a school project. V1 is the modulating signal (sine wave, amplitude 5V, frequency 1KHz) V2 is the carrier signal (sine wave, amplitude 30mV, ...
Rik99's user avatar
  • 3
-5 votes
1 answer
788 views

How can I increase amplitude without affecting frequency accuracy? [closed]

I have generated a variable frequency generator which generates frequency from 0 to 10kHz, with the amplitude of 4.8-5.2 V. How can I increase the amplitude up until 8V without affecting the accuracy ...
Wan Shahmisufi Wan Jamaludin's user avatar
0 votes
1 answer
557 views

The circuit that gives the higher-voltage one of the two input signals to output

I need a circuit that behaves as the box with the question mark in the graph I drew. I tried to design a few circuits with op-amps but I couldn't get an output as I wanted.
redo's user avatar
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1 vote
1 answer
146 views

Manipulating Amplitude and Axis of symmetry of BUBBA oscillator in Simulink

So far i have a bubba ocsillator that can produce smooth sinusoidal waves, but the output waveform is asymmetric about the y-axis and the amplitude is not 1. What exactly do i need to do to :- Make ...
Dravidian's user avatar
  • 211
6 votes
1 answer
2k views

Why is the signal amplitude low on the oscilloscope even though the impedance is matched?

I have a photodetector with differential outputs that are each 50-ohm terminated. When I connect one output to the oscilloscope to look at the signal, I see a higher signal amplitude with higher ...
Mohamed Tarek's user avatar
-1 votes
3 answers
249 views

Is there a prefered Modulation Index with Pulse Amplitude Modulation? (PAM)

You can vary the modulation index of Pulse Analogue Modulation. For instance, the RF carrier could be 100% modulated on marks, and zero % on spaces. Or, 100% on marks, 50% on spaces. In theory you ...
user avatar
0 votes
1 answer
684 views

How to double the amplitude of an AC Signal

If I have an input signal, \$v_{in} = A\sin(2 \pi ft)\$, and I am wanting to double the signal's amplitude so that my output then becomes \$v_{out} = 2A\sin(2 \pi ft + \theta)\$, how might one achieve ...
user avatar
0 votes
2 answers
494 views

Basic Oscillator Circuit

I am wondering, if the quartz crystal, to be used as part of an oscillator, needs additional components to oscillate at its resonant frequency? And if it does, which are those extra components that ...
lucenzo97's user avatar
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8 votes
5 answers
5k views

What does "shift keying" mean in the context of digital modulation?

English is not my native language and I do not understand why the words "shift keying" were used to describe some types of digital modulation. What does "keying" mean in the context of signals and ...
yoyo_fun's user avatar
  • 793
0 votes
2 answers
406 views

Envelope detector and DC voltage

I am currently working in the simulation of a physics project. One of the detectors inputs a voltage V1: V1(t)= D+Acos(wt) and tries to extract the amplitude. I read that a simple Envelope detector ...
Victor's user avatar
  • 101
1 vote
2 answers
552 views

What is the use of R5, C4, C2, R6, R5, D1 in the below amplitude modulation circuit?

the project is taken from this website for my college project http://www.instructables.com/id/Modulating-Audio-on-a-LED/ I think I have figured out function of few components but still need ...
Pi314's user avatar
  • 11
7 votes
3 answers
39k views

Peak to Peak vs. Amplitude

For a sine wave, Amplitude is the fluctuation or displacement of the wave from its mean value. Peak-to-peak (pk-pk) is the difference between the maximum positive and the maximum negative amplitudes ...
Yasindu's user avatar
  • 157
1 vote
1 answer
448 views

Why is the calibration signal's amplitude of my oscilloscope 10 times higher than stated?

I'm trying to calibrate my HAMEG HM507 oscilloscope. The manual says that the calibration signal is 0.2Vpp. With the attentuation of the probe set to x10, volts/division set to 5mV/cm, time/division ...
uzumaki's user avatar
  • 165
1 vote
1 answer
2k views

AM Demodulation with Envelope Detector

I have to project an AM demodulator using an Envelope Demodulator. To which kinds of AM (DSB, DSB-SC, VSB, SSD) is it applicable to? Thanks
scottbear's user avatar
-1 votes
1 answer
1k views

Power of AM signal [closed]

I need to calculate the power of the sidebands and the carrier. The carrier is 10*cos(2pi10⁶t) [V] and the modulating is 3*cos(2pi10³t) [V]. The modulated signal is 10*cos(\$w_0\$t)+\$\frac{3}{2}\$*...
scottbear's user avatar
0 votes
2 answers
972 views

Signal with little amplitude and offset in LTSpice

i have a problem trying to work with a signal whose amplitude is in nanovolts and has an offset of 1V. LTSpice doesn't plot the amplitude because is too small in comparation to the offset (the ...
jpmena6's user avatar
2 votes
4 answers
9k views

In this Amplitude Modulation circuit, what is the purpose of the diode load (L2)?

In this circuit i know that the diode mixes the signal. I know that after the diode it is a half-wave. I know that the capacitor reproduces the lost signal. I have a feeling L2 is maybe plays a part ...
jake's user avatar
  • 21
-2 votes
2 answers
173 views

Drawing basic AM signal [closed]

I am confused with how to draw the following AM signal: S(t)=6cos(12t)+3/2cos(14t)+3/2cos(10t)
Quirik's user avatar
  • 287
0 votes
0 answers
606 views

QAM Modulation Frequency vs Carrier Frequency

In QAM (Quadrature Amplitude Modulation) theory what is the relationship between the modulation frequency and the carrier frequency called? It is often stated in QAM tutorials that the carrier ...
FiddyOhm's user avatar
  • 2,694