Amplifiers

Example 1. Amplifiers Development in ConceptDraw DIAGRAM

Amplifiers are described according to the properties of their inputs, outputs, and how they relate. There is an enormous quantity of kinds of amplifiers in all shapes, sizes, and purposes.

• Transistor amplifiers use bipolar junction transistors (BJT) or metal oxide semiconductor field-effect transistors (MOSFET) as the active element. Currently, they are the most used type of amplifiers.
• Vacuum-tube amplifiers use a vacuum tube as the active device. They find their application in high-power devices: radars, communications equipment, countermeasures equipment, microwave devices, high-end audio equipment, etc.
• Video amplifiers are wide band amplifiers, which process video signals and preserve the DC level of the signal. They are used in video equipment, TV and radar systems. The bandwidth varies from 0 Hz to more than 6 MHz.
• Audio power amplifiers amplify low-power electronic audio signals to a level enough for driving loudspeakers or headphones. They often have two output channels and provide equal power to each of them.
• Musical instrument amplifiers are a kind of audio power amplifiers used to increase the sound level of musical instruments.
• Radio frequency amplifiers are tuned amplifiers. Their gain and noise performance are low, frequency is managed by a tuned circuit, and the bandwidth varies from wide to narrow.
• Intermediate frequency amplifiers are used in radio, TV, and radars. They are tuned amplifiers and operate at different frequencies according to the type of equipment, but in any case, their frequency is lower than that of the received radio signal but higher than produced audio or video signals.
• DC amplifiers are applied in many electrical control systems and measuring instruments and amplify DC (0 Hz) voltages or very low-frequency signals.
• Microwave amplifiers are traveling wave tube amplifiers (TWTAs) used at low microwave frequencies and can amplify across a broad spectrum of frequencies.
• Operational amplifiers are small signal amplifiers currently used in integrated circuits. Initially, they were used for performing mathematical operations in early analog computers. Usually the op amps have very high open loop gain and differential inputs.
• Fully differential amplifiers are the kind of operational amplifiers with differential outputs. Often they are constructed using BJTs or FETs.
• Buffer amplifiers are placed between two circuits, have a high input impedance and a low output impedance. Typically, they have a gain of one and equal output and input amplitudes. Buffer amplifiers are designed to except the affecting of one circuit on the other and are also used as impedance matching devices.
• Ultrasonic amplifiers are used in remote control systems, ultrasound scanning and ultrasonic cleaning devices, and operate with frequencies from around 20kHz up to 100kHz.
• Wideband amplifiers have an extremely wide bandwidth and low gain. They are used in equipment that measures signals over a wide range of frequencies, for example, in oscilloscopes.
• Weak-signal amplifiers operate with extremely small input signals and generate minimal internal noise. They are used in wireless receivers, acoustic pickups, audio tape players, and compact disc players.
• Power amplifiers, linear and nonlinear amplifiers, switched mode amplifiers, distributed amplifiers, and negative resistance amplifiers are additional examples of amplifiers variety.

Example 2. Amplifiers Library Design Elements

Moreover, the amplifiers are classified from A to D class:

• Class A amplifiers are the most linear form of amplifiers. They provide the best output quality, with the lowest distortion, but are large, heavy, power-hungry, and inefficient.
• Class B amplifiers are more efficient and cheaper and offer poorer linearity. They often use two amplifiers to cover the complete signal and suffer from crossover distortion, where one half of the amplifier turns off and the other operates.
• Class C amplifiers have higher efficiency but poor output quality and a high level of distortion. They are often used for RF amplifiers.
• Class D amplifiers use switching technology within the amplifier and have high efficiency.
• Class AB joins the best properties of both A and B classes: the quality of class A and the efficiency of class B. Class AB amplifiers strive to overcome the cross-over distortion and achieve better linearity, at the same time by sacrifying efficiency.

Electronic Block Diagrams solution for ConceptDraw DIAGRAM software offers a wide range of tools for designing Electronic block diagrams of different kinds, schematics of amplifiers and complex circuits including them as a part. The included vector design elements — amplifiers, repeaters, electronic blocks, power convertors, delay elements, pulses, electric filters, waveforms, and many more provide the ability to create an Electronic circuits and Electronic block diagrams of any complexity.

Example 3. LNB Block Diagram

The Electronic circuits and Electronic block diagrams samples you see on this page were created in ConceptDraw DIAGRAM software using the drawing tools of the Electronic Block Diagrams Solution. These examples successfully demonstrate the solution's capabilities and the professional results you can achieve using it. An experienced user spent 5-10 minutes creating each of these samples.

Use the drawing tools of the Electronic Block Diagrams solution to design your own Electronic block diagrams and Electron circuits infographics quick, easy, and effective.

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