Distortion is the alteration of the original shape (or other characteristic) of a signal representing an object, image, sound or waveform.

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Distortion in an amplifier

I need help with this exercise: "Given a common-source amplifier without any charge, it can be seen that there's cut-off distortion. How can you fix that, without changing the gain of the amplifier?" ...
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66 views

What is the harmonic content of a PWM signal?

Suppose I'm using a 3.6 kHz carrier to reproduce a 60 Hz sine wave. To properly design a filter for this application to hit a specific harmonic distortion target, I need to know the harmonic content ...
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28 views

Amplitude modulation transmission distortion

I need to clarify a question. Let's say that in a wire I carry a current modulated in time so that it is an amplitude modulation of a sinusoidal carrier with a modulating sinusoidal wave. In frequency ...
3
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3answers
186 views

Vacuum tube distortion mechanism

What is the mechanism by which Triodes in audio tube amps generate harmonic distortion? It is my understanding that the distortion is generated by means of electron bunching. That is, when the grid ...
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48 views

What are the benefits of this Class A followed by Class AB instead of just a Class AB amplifier?

In figure 1, there's are two BJTs at the left side in Class A amplifier configuration followed by two BJTs in Class AB amplifier configuration. The two transistors that are added at the left side ...
7
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3answers
796 views

How do diodes and capacitors reduce Crossover distortion?

I found this diagram about Class AB Amplifiers and the reduction of crossover distortion: http://www.electronics-tutorials.ws/amplifier/amp_7.html This pre-biasing voltage either for a ...
2
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1answer
121 views

What is Transient Intermodulation Distortion?

I've looked at Op-amp slew rate over frequency How it is possible to make bad audio amp? Which op-amp for audio? as well as several papers about the topic but although I may get the basis of what ...
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1answer
33 views

Would T feedback network of transimpedance cause serious distortion?

I am now designing a transimpedance using ADA4062-2 to detect signal from a photodiode. The first image is the equivalent circuit. The signal from PD contains 1kHz sine wave and 2kHz sine wave and ...
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1answer
85 views

How can I increase the overall gain on this circuit?

This is a circuit from Nicholus Boscorelli's Stompbox Cookbook, page 194. The circuit introduces crossover distortion. i built it and it works fine. However it won't go past unity gain which wouldn't ...
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70 views

Cross-over distortion thanks to short circuit protection

I am trying to build a AB Amplifier for school with some darlington transistors. Everything seemed to go fine until I added the short circuit protection. From that moment a cross-over distortion ...
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192 views

How to make pulse wave from sine wave - audio frequency

I'm looking for a quick-and-dirty way of converting something close to a sine wave to a narrow pulse wave. Please see the image: a low bass note played through a broken transformer. I'm trying to ...
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1answer
39 views

Harmonic distortion and Nyquist rate (Spurs above the Nyquist rate of a DAC)

I have been reading an article during the past few days for a project I am doing and I've come across a point that bugs me out. It is about improving the spurious free dynamic range (SFDR) of DACs. ...
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2answers
420 views

Replacing a FET to avoid the body diode (audio switching)

Here is a circuit I've found online for switching a guitar signal, it uses a mechanical relay in order to rout the signal through a sound processing unit or around it, bypassing the circuit. ...
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1answer
242 views

SMD capacitors for a guitar distortion pedal

I'm trying to build a guitar distortion pedal. Alright, a bit about the motivation behind this project : It's my friend's birthday in a couple of days and I wanted to get him a distortion pedal cause ...
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2answers
239 views

Extremely noisy signal after voltage follower/buffer [closed]

I am trying to create a voltage follower for my CCD linear array. When I measure the signal with oscilloscope directly from the CCD outptut - the signal is reasonably clean. However, when I measure if ...
2
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3answers
886 views

Connecting ADC pin to op. amp. output distorts signal

I am using a STM32 Cortex M3 microcontroller and have configured the ADC. I have verified that the ADC works by measuring different voltages on the micro controller eval. board. When I connect my ADC ...
2
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1answer
423 views

Distortion in the output of amplifier circuit using uA741 + schematics and graphs

I'm simulating an audio amplifier with uA741 in pspice (student version). The input signal is a 0.1v (100mv) sine wave with frequency between 1kHz and 10kHz. The theoretical gain is 33 but in ...
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1answer
370 views

What type of potentiometer to use?

I'm making a Metal distortion pedal ill be using 6 potentiometers POT1 Distortion 250K POT2 low freq control 100K POT3 high freq control 100K POT4 mid 100K ...
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2answers
177 views

Total Harmonic Distortion

If a specific project specification says "...amplifier must be linear such that the harmonic distortions are maintained below -40dB...", does that mean that a THD of -30dB would meet the requirements ...
6
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3answers
519 views

What effect does bit depth of an ADC have on noise floor, THD, or any other specification?

I was told recently that there is a direct relationship between bit depth of a measurement adc and minimum measurable noise floor, which in turn affects accuracy of THD measurements of DUT. I'm afraid ...
2
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2answers
151 views

what is this distortion?

what is this distortion? This is the circuit where it is derived As you can see, it looks like there is a problem in the negative half cycle, its not really a straight clip. The waveform is ...
2
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2answers
551 views

Humming and Transmission issues

First of all, I am going through designing all of this because I did not find a ready made circuitry for my purpose which is mentioned later. If you know a circuitry that is well tested and does what ...
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1answer
405 views

What's the relationship between harmonic distortion and intermodulation distortion?

So if you take a sine wave and put it through a non-linear transfer function, it experiences harmonic distortion, which produces other sine wave components at integer multiples of the original. If ...