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Why to have a filter before and after a low noise amplifier?

To cut off unwanted frequencies, unwanted frequencies are called noise.


Need of pre-emphasis and de-emphasis circuits in digital communication?

de-emphasis is the complement of pre-emphasis, in the antinoise system called emphasis. Emphasis is a system process designed to decrease, (within a band of frequencies), the magnitude of some (usually higher) frequencies with respect to the magnitude of other (usually lower) frequencies in order to improve the overall signal-to-noise ratio by minimizing the adverse effects of such phenomena as attenuation differences or saturation of recording media in subsequent parts of the system.Special time constants dictate the frequency response curve, from which one can calculate the cutoff frequency.


Why RC coupled amplifier is called audio amplifier?

Because radio control relies on different frequencies. Since frequencies are involved in the process, an audio amplifier can be used to amplify alternating currents (currents that change), and it does the same job.


What is an ultra wideband antenna?

Antennas can be tuned for specific frequencies to increase their gain. These types of antenna are sometimes referred to as narrowband. An ultra wideband antenna works for a lot of frequencies around what is called a center frequency. For example, if you had a narrowband antenna centered around 10 megahertz it might work for frequencies from 9 to 11 megahertz for example. If it were wide band it might go from 5 to 15 megahertz, and so forth. The bands are clustered around specific center frequencies for different applications.


How long is a cord?

There is no unit of measure called a cord.

Related Questions

A measure of the space that matter occupies?

That is called the volume.


What are the range of frequencies that can be transmitted called?

The range of frequencies that can be transmitted is called the bandwidth. It refers to the range of frequencies within a signal that can be effectively transmitted through a communication channel.


What is the measure of the space of a solid figure occupies called?

Its volume.


What is the measure of the space a solid figure occupies is called?

The measure of the amount of space a solid figure is Volume


What is the measure of the amount of space a solid figure occupies called?

The measure of the amount of space a solid figure is Volume


What is the measure of how much space and object occupies?

The measure of how much space an object occupies is called volume. It is usually measured in cubic units like cubic meters or cubic centimeters.


What frequencies do crystals have?

Crystals have specific frequencies called resonant frequencies, which are unique to each type of crystal. These frequencies are determined by the crystal's molecular structure and can be used in various applications such as technology, healing, and communication.


What is the amount of space taken by an object called?

The amount of space taken by an object is called its volume. This is the measure of how much three-dimensional space an object occupies.


What is the term for the unit that measure wave frequencies?

The unit of frequency is "Hertz", abbreviated "Hz". Also called "cycles". Also called "per second".


What is the waves with the longest wavelenghts and lowest frequencies are called?

It isn't clear what type of wave you are talking about. If you mean electromagnetic waves, the answer is "radio waves".


What is anything that has mass and occupies space?

Matter


What is the sound waves of frequencies above 20 k hz is called?

Sound waves with frequencies above 20 kHz are referred to as ultrasonic waves. These frequencies are beyond the range of human hearing, but they are used in applications such as medical imaging, cleaning, and communication systems.