What prevents a transistor from oscillating or amplifying frequency signals above certain limits?
Why should transistors used in high frequency circuits be different from ordinary transistors used in audio and low frequency applications? What prevents a transistor from oscillating or amplifying frequency signals above certain limits? What is SMS See in this article how to get transistors for operation at very high frequencies and what are the problems faced by the designer. All readers know that the transistors used in high frequency circuits are different from those used in the amplification and generation of audio signals, low frequencies and direct current. Because? To understand the differences well, we must start at the beginning, that is, the very structure and function of a bipolar transistor. In Figure 1 we show the most common configuration used for a transistor as an amplifier which is the common emitter configuration, where the signal is applied between the base and the emitter, flowing a proportionally larger current between the collector and the emitter. ...