The world of linear amplifiers

A linear amplifier, also called a linear amplifier and popularly referred to as a 'stove'. They are electronic amplifiers that provide a constant gain of the output signal that is proportional to the input signal. They are used to amplify signals in radio frequency and audio applications. For example, they increase the power of an RF signal before transmission or to amplify an audio signal before it is sent to a loudspeaker. In radio communications where a linear is used, the current is measured in kilowatts.

Not only for radio communication

Although linear amplifiers are often associated with radio communications, they are also used in other applications such as audio equipment and laboratory equipment. The term linear usually refers to the common base linear amplifier that is capable of producing signals that exactly reproduce the input signal.

An important characteristic of linear amplifiers is their ability to amplify an electrical signal without distortion. This means that the output signal is a faithful representation of the input signal. Linear amplifiers are characterized by their linearity, which refers to the extent to which the output signal is a faithful replica of the input signal.

Types of linear amplifiers

Linear amplifiers are classified based on the type of input signal they are designed to amplify:

• Voltage amplifiers : amplify a voltage signal
• Current amplifiers: amplify a current signal
• Power amplifiers : amplify a power signal

They can be designed to operate within a specific frequency range depending on the type of amplifier and the application. Linear amplifiers can operate in narrowband or wideband frequency ranges and can be designed for both low and high power levels.

Performance factors of linear amplifiers

The performance of linear amplifiers is affected by several factors including the type of amplifier, the frequency range, the input and output impedance, and the circuit design. A linear amplifier must operate within its specified frequency range and provide a linear output. It must also be designed to match the input and output impedance of the system in which it is used.

Important factors are:

• Load impedance: The electrical resistance of the device connected to the output of a linear amplifier. Incorrect impedance can lead to distortion or instability.
• Supply voltage: This provides the necessary voltage and current to power both the amplifier and the connected load. Insufficient power can lead to distorted or weak input signals.
• Operating frequency: determines the quality of the processed signal. Higher frequencies require more power to amplify.
• Input signal: Must be compatible with the amplifier to avoid distortion.

Application of linear amplifiers

Linear amplifiers are widely used in various applications.

• Audio systems : In both home and professional audio systems, linear amplifiers are used to increase the sound level. In a home audio system, a linear amplifier usually consists of a preamplifier and a power amplifier.
• Communications Systems : Used to increase the signal strength of radio waves for longer distance communications, such as air-to-ground communications or satellite communications.
• Radio broadcasting : Amplifies the power of broadcasts so they can be heard over longer distances.
• Test and measurement equipment : Used to test the frequency response of a device or measure the noise figure of a system.
• Medical Equipment and Instrumentation : Essential in many medical and scientific instruments.

Linear amplifiers are versatile and reliable components in many electronic devices and are essential for many applications. With continued technological advances, it is likely that their use in more advanced applications will increase.

Discover more at Deltron

At Deltron, the online store for radio communication equipment and all accessories such as parts and accessories, you will find a wide range of high-quality linear amplifiers. Whether you are an audiophile, a professional sound engineer, or work in the communications industry, we have the right amplifier for your needs.

Visit our website to explore our extensive offering and find the perfect amplifier for your application. Enhance your signals and experience the difference with Deltron's high-quality, high-performance products.