Table of Contents
What is the difference between an audio frequency amplifier and a radio frequency amplifier?
AF amplifier is used for audio frequencies, i.e. from 20 Hz to 20 Khz. RF amplifier is used for radio frequencies, i.e. 500 KHz upwards.
What are the fundamental differences between Class A and Class C amplifiers?
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| Class | A | C |
|---|---|---|
| Operating Cycle | 3600 | Less than 1800 |
| Position of Q point | Center of load line | Below X-axis |
| Efficiency | Poor, 25\% to 50\% | High |
| Distortion | Absent No distortion | Highest |
Can tuned amplifiers be used for audio signal amplification?
Definition: Tuned amplifiers are used to for the amplification of a specific frequency signal or a narrowband frequency signal. Basically high frequency or radio frequency signals are amplified using tuned amplifiers. Tuning (i.e., selecting) of frequency is done by using a tuned or resonant circuit at the load.
What are the different types of tuned amplifier?
Types of Tuned Amplifiers
- Single tuned.
- Double tuned.
- Stagger tuned.
What are the requirements of a tuned amplifier?
4 Requirements of Tuned Amplifier The basic requirements of tuned amplifiers are : • The amplifier should provide selectivity of resonant frequency over a very narrow band. The signal should be amplified equally well at all frequencies in the selected narrow band.
What is an amplifier and its purpose and describe the types of amplifier?
Amplifiers are the devices that increase the amplitude of the input signal. The output of the power supply is modulated by the Amplifier. Amplifiers increase only the amplitude and the other parameters such as frequency and shape remain constant. There are many types of amplifiers available.
What is the difference between Class A amplifier and Class B amplifier?
Class A amplifiers can be made very linear, but with limited efficiency. In theory, a class A amp can achieve 50\% efficiency with inductive output coupling or 25\% with capacitive coupling. Class B amplifiers are subject to “crossover” distortion, but efficiency runs theoretically as high as 78.5\%.
What is the fundamental difference among Class A Class B Class AB amplifiers?
The difference between a Class A and a Class AB amplifier is simply the point at which the transistors are biased. In the case of Class A, the transistor is biased so that over the entire cycle of the RF input, the transistor is operating within its linear portion.
What is the main application of tuned amplifier?
The applications of the tuned amplifiers are: The circuits of video signal amplification in the wideband range use these amplifiers. For wireless long-distance communications, these amplifiers due to high gains are used. At the receiving stage, these are used as radio frequency amplifiers.
What is a tuned amplifier?
Definition: Tuned amplifiers are used to for the amplification of a specific frequency signal or a narrowband frequency signal. Basically high frequency or radio frequency signals are amplified using tuned amplifiers. Tuning (i.e., selecting) of frequency is done by using a tuned or resonant circuit at the load.
What is the frequency response curve of tuned amplifier?
The frequency response curve for a tuned amplifier is similar to that of the resonance curve of a tuned circuit. It is to be noted that the response of the tuned circuit is maximum in case of the resonant frequency. Thus, we can see the response curve is at its maximum in case of the resonant frequency.
Why an audio amplifier is not used for radio frequency signal amplification?
An audio amplifier is unable to select a particular frequency signal. As it provides a mixture of frequency that lies in the range of 20 Hz to 20 KHz. Thus an audio amplifier is not used for radio frequency signal amplification. As tuned circuits possess the property of resonance.
Why do we use L and C in tuned amplifiers?
The usage of reactive components like L and C, minimizes the power loss, which makes the tuned amplifiers efficient. The selectivity and amplification of desired frequency is high, by providing higher impedance at resonant frequency. A smaller collector supply VCC would do, because of its little resistance in parallel tuned circuit.