Transistor is a kind of solid semiconductor device (including diode, triode, field effect transistor, thyristor, etc., sometimes especially refers to bipolar device), with detection, rectification, amplification, switching, voltage regulation, signal modulation and other functions. As a variable current switch, the transistor is able to control the output current based on the input voltage. Unlike ordinary mechanical switches, transistors use electrical signals to control their own opening and closing, so the switching speed can be very fast, and the switching speed can reach more than 100GHz in the laboratory.
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