Signal amplifiers are used to improve the signal strength, increase the communication capability of the system, extend the transmission distance, reduce the size of the equipment, and enable the equipment to meet a wider range of use. In an electronic circuit, in order for current to flow from one point to a different place, power or voltage needs to be supplied to that point to generate a signal.
Signal amplifiers are divided into linear amplification, nonlinear amplification, broadband amplification, high-frequency amplification, audio amplification and video amplification, etc., and their uses are different.
The linear amplifier is to connect the output of the signal source to a fixed gain resistor, and then adjust the resistor to make it suitable for the signal-to-noise ratio and noise figure;
The nonlinear amplifier is a negative feedback network with a variable inserted between the signal source and the signal load impedance. Its principle of action is to suppress interference and improve the signal-to-noise ratio through the feedback of the amplifier output;
Broadband amplifiers use the characteristic of attenuation when the signal is affected by factors such as the internal resistance of the amplifier when passing through the internet signal booster to increase the amount of amplification.
A high-frequency amplifier amplifies the signal under high-frequency conditions. The audio amplifier is to amplify the audio signal under the condition of high frequency. Generally, there will be an isolation transformer between the signal source and the amplifier to eliminate environmental noise and interference from other equipment.