Table of Contents
What is meant by intermodulation distortion?
Intermodulation Distortion (IMD): When two signals mix in non-linear circuits or devices, new frequency components are created that are not in the original signal. The resulting signal error is called intermodulation distortion, or IMD. Synonyms.
Why nonlinear distortion is called harmonic distortion?
With non-linear distortion the application of a sinusoidal input voltage results in a periodic output waveform that is non-sinusoidal. Fourier analysis shows that spurious harmonics are present, the result being known as harmonic distortion. Equation 10.24 gives the total harmonic distortion.
What is intermodulation distortion in amplifier?
Intermodulation Distortion can occur when two or more signals are mixed through a non-linear amplifier device. Each of the tones interacts with one another, producing altered (or modulated) amplitudes. Thus, it is termed Intermodulation Distortion because it is between harmonic frequencies.
What is known as harmonic distortion?
Harmonic distortion is defined as the ratio of harmonics to fundamental when a (theoretically) pure sinewave is reconstructed, and is the most common specification.
What is meant by intermodulation?
Definition of intermodulation : the production in an electrical device of currents having frequencies equal to the sums and differences of frequencies supplied to the device or of their harmonics.
What is signal intermodulation?
Intermodulation (IM) or intermodulation distortion (IMD) is the amplitude modulation of signals containing two or more different frequencies, caused by nonlinearities or time variance in a system.
What are VFD harmonics?
Harmonics are defined from the Fourier series that defines any periodic wave shape. Typically a three-phase, six-pulse VFD will draw nonlinear current that introduces the fifth and seventh harmonics on top of the fundamental frequency. The symptoms of the VFD related harmonics are evident as a distorted line voltage.
Do capacitors cause harmonics?
Capacitors are linear reactive devices, and consequently do not generate harmonics. The installation of capacitors in a power system (in which the impedances are predominantly inductive) can, however, result in total or partial resonance occurring at one of the harmonic frequencies.
What is electrical harmonic distortion?
Harmonics are a distortion of the normal electrical current waveform, generally transmitted by nonlinear loads. Switch-mode power supplies (SMPS), variable speed motors and drives, photocopiers, personal computers, laser printers, fax machines, battery chargers and UPSs are examples of nonlinear loads.
Why does intermodulation distortion occur?
Intermodulation Distortion (IMD) occurs when two or more signals are used in a non-linear system. The spectrum at the output of the non-linear device will not only consist of the original signals but will also contain the sum and difference of the input signals along with their harmonics.