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How can we reduce frequency distortion?
Using two THS3491 amplifiers in a load-sharing configuration splits the output current drive equally between the two amplifiers at ±250 mA, resulting in a less distorted output waveform across frequency.
What is meant by frequency distortion?
[¦frē·kwən·sē di′stȯr·shən] (electronics) Distortion in which the relative magnitudes of the different frequency components of a wave are changed during transmission or amplification. Also known as amplitude distortion; amplitude-frequency distortion; waveform-amplitude distortion.
What is the cause of frequency distortion in an amplifier?
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.
How do you prevent frequency distortion in transmission lines?
In order to reduce frequency distortion occurring in the line,
- The attenuation constant α should be made independent of frequency.
- By using equalizers at the line terminals which minimize the frequency distortion.
What happens if the resistor of an op amp is too low?
If the values of the resistors are too low, a great deal of current would be required from the op amps output for operation. This causes excessive dissipation in the op amp itself, which has many disadvantages. The increased dissipation leads to self-heating of the chip, which could cause a change in the dc characteristics of the op amp itself.
What happens when the frequency of an op amp is increased?
As can be seen in the diagram, in the limit, the op amp slewing distortion will result in the creation of a triangular waveform. If the frequency is increased the op amp will be even less able to keep up and therefore the amplitude of the output waveform will decrease.
Why does an 8Ω speaker need an op-amp?
An ordinary op-amp is designed to drive small-signal loads such as small headphones, the inputs of other amplifiers, or other circuits. A 8Ω speaker simply requires too much current (amps vs millamps) for an op-amp to drive it alone.
Why do op amps have different slew rates?
These all combine together to limit the rate at which the output can change from one level to another. Op amps may have different slew rates for positive and negative going transitions because of the circuit configuration.