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WHAT IS AMPLIFIER DIRECTIVITY?

Esther FlemingAugust 20, 2020


WHAT IS AMPLIFIER DIRECTIVITY?

Directivity (active directivity) is defined as the difference between isolation
and forward gain in dB. Gain (forward gain, G) for RF amplifiers is the ratio of
output power to input power, specified in the small-signal linear gain region,
with a signal applied at the input.


WHAT IS OUTPUT VSWR?

Output VSWR is a measure of how much power is reflected back from the
amplifier’s output port when an external signal is applied to that port. VSWR
varies from a theoretical value of 1:1 for a perfect match to greater than 20:1
for total mismatch.



WHAT IS THE AMPLIFIER EFFICIENCY?

Simply put, the higher the efficiency rating of an amplifier, the more power the
amp will make and the less heat it will generate overall. While having a 100%
efficient amplifier would be great, it is physically impossible to make an
amplifier that loses nothing when making power.

What is a compression point?



The 1 dB compression point (P1dB) is the output power level at which the gain
decreases 1 dB from its constant value. Once an amplifier reaches its P1dB it
goes into compression and becomes a non-linear device, producing distortion,
harmonics and intermodulation products.

What is forward and reflected power?



A standing wave on a transmission line can be thought of as being composed of
two traveling waves, one moving toward the load (the “forward” wave) and one
moving in the opposite direction (the “reflected” wave).


WHAT ARE THE 4 TYPES OF AMPLIFIERS?

different types of amplifiers are also often described in system or block
diagrams by name.

 * Amplifier.
 * Audio Frequency Amplifier.
 * Intermediate Frequency Amplifier.
 * R.F. Amplifier.
 * Ultrasonic Amplifier.
 * Operational Amplifier.


WHAT ARE THE SIX TYPES OF POWER AMPLIFIERS?

There are different classes of amplifiers starting from A, B, C, AB, D, E, F, T
etc. Out of those classes most commonly used audio amplifiers classes are A, B,
AB, C. Other Classes are modern amplifiers which use switching topologies and
PWM (Pulse Width Modulation) technique to drive the output load.

WHAT IS AMPLIFIER IN PHYSICS?

An amplifier, electronic amplifier or (informally) amp is an electronic device
that can increase the power of a signal (a time-varying voltage or current). The
amount of amplification provided by an amplifier is measured by its gain: the
ratio of output voltage, current, or power to input.

What is amplifier function?

amplifier, in electronics, device that responds to a small input signal
(voltage, current, or power) and delivers a larger output signal that contains
the essential waveform features of the input signal.

What is RF IMD?

Intermodulation Distortion (IMD) occurs when two or more signals are used in a
non-linear system. The products 2f1 and 2f2 are known as “Harmonics” which are
nothing but replicas of a signal appearing at integer multiples of the
fundamental signal. These sideband frequencies are considered to be undesirable.

https://www.youtube.com/watch?v=3LS2EXQaqcQ

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