Table of Contents
- 1 Which distortion is least objectionable in case of audio amplifiers?
- 2 What does intermodulation distortion sound like?
- 3 Which is the main disadvantage of Class B amplifier?
- 4 What causes intermodulation distortion?
- 5 What are the two main effects of distortion?
- 6 Why it is called push pull amplifier?
Which distortion is least objectionable in case of audio amplifiers?
34. Which distortion is least objectionable in case of audio amplifiers?…Exercise :: Analog Electronics – Section 13.
| A. | Phase distortion |
|---|---|
| B. | Frequency distortion |
| C. | Harmonic distortion |
| D. | Inter-modulation distortion |
What is the figure of merit of Class B amplifier?
Modern Class AB amplifiers commonly have peak efficiencies between 30 and 55% in audio systems and 50-70% in radio frequency systems with a theoretical maximum of 78.5%.
What does intermodulation distortion sound like?
At best, Intermodulation Distortion leads to dull, veiled, or lifeless-sounding music. At worst, everything sounds harsh or distorted. However, as with Total Harmonic Distortion, Intermodulation Distortion is usually so low that it is imperceptible.
What causes frequency distortion?
The frequency distortion occurs when the fundamental frequency combines with the second harmonic to distort the output signal. Frequency distortion due to harmonics is always a possibility in amplifier circuits containing reactive elements such as capacitance or inductance.
Which is the main disadvantage of Class B amplifier?
Disadvantages of Class B amplifier. The major disadvantage is the cross-over distortion. Coupling transformers increases the cost and size. It is difficult to find ideal transformers. Transformer coupling causes hum in the output and also affects the low frequency response.
What are Class B amplifiers used for?
The class B amplifiers are the positive and negative halves of the signals, that are allocated to the different parts of the circuits and the output device switched ON and OFF continuously. The basic class B amplifiers are used in two complementary transistors which are FET and bipolar.
What causes intermodulation distortion?
Intermodulation is caused by non-linear behaviour of the signal processing (physical equipment or even algorithms) being used. The same nonlinear system will produce both total harmonic distortion (with a solitary sine wave input) and IMD (with more complex tones).
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.
What are the two main effects of distortion?
The effects alter the instrument sound by clipping the signal (pushing it past its maximum, which shears off the peaks and troughs of the signal waves), adding sustain and harmonic and inharmonic overtones and leading to a compressed sound that is often described as “warm” and “dirty”, depending on the type and …
How do you reduce distortion?
The following design principles can control distortion:
- eliminate welding by forming the plate and using rolled or extruded sections.
- minimise the amount of weld metal.
- do not over weld.
- use intermittent welding in preference to a continuous weld pass.
- place welds about the neutral axis.
Why it is called push pull amplifier?
A Push-Pull Amplifier combines two signals to form a third signal. The circuit is called a Push-Pull because one transistor pushes in one direction while the other pulls in another direction. Both transistors are NPN types in this case. A common small signal BJT is the 2N2222 NPN Transistor [low power].
What is the disadvantage of class B push pull amplifier?
The Class B amplifier circuit above uses complimentary transistors for each half of the waveform and while Class B amplifiers have a much high gain than the Class A types, one of the main disadvantages of class B type push-pull amplifiers is that they suffer from an effect known commonly as Crossover Distortion.