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A block diagram of the amplifier.
An amplifier is a device designed to amplify the power of the input signal. Strengthening occurs with the help of active elements due to energy consumption from the power source. The active elements in amplifiers are often transistors; Such amplifiers are called semiconductor, or transistor. In any amplifier, the input signal controls the transfer of power supply energy to the load.
By the nature of the amplified value, voltage, current and power amplifiers are distinguished. It is convenient to subdivide the amplifier stages according to the ratio of Rin and Rr values. If the amplifier Rin >> Rr, then it is a voltage amplifier. In the current amplifier Rin << Rr, i.e. There is a current input. In the power amplifier, the input is matched to the input source, i.e. Rin = Rr.
For DC amplifiers, direct (galvanic) communication is used. Note that the direct connection between the cascades is widely represented in integrated circuits and will be considered further when studying an operational amplifier.
The basic circuits of transistor amplifiers:
An amplifier is a device (quadrupole) that increases the signal power. The increase in signal power occurs due to the conversion of the energy of the power source into the signal energy. The waveform during amplification should be maintained without significant distortion.
The range of amplified frequencies amplifiers are divided:
· On DC amplifiers (UFD);
· On low (sound) frequency amplifiers (ULF);
· High frequency amplifiers (UHF);
· To ultra high (microwave) amplifiers.