Moreover, frequency response is the base of understanding the operation of RF amplifiers. Understanding the response enables us to predict the operating frequency range of an amplifier for which it provides a constant gain. At higher frequencies, the amplifier gain starts to reduce because of internal capacitances. Junction capacitances form internal RC circuits in BJT amplifiers that affect the frequency response. Each transistor responds differently to a variety of frequencies. Predicting the frequency response of a transistor is a crucial step in transistor amplifier design. An additional lightly doped N- layer is added in most power semiconductor devices to improve current rating and offer conductivity modulation. In the case of FETs, the source and drain have the same doping concentration. For BJTs, the doping profile of each terminal varies. The amount of doping is one of the factors to decide the flow of current in a transistor. Determine doping levelsĭoping concentration is another important factor for transistor design. SponsoredPOWER MANAGEMENT IMPROVING POWER SUPPLY DESIGN Five Steps to Quick and Efficient Design 4. For obtaining a high current gain, a Darlington transistor design must be considered. BJT must be designed to switch heavy currents and power transistors to serve industrial applications with high-power ratings.

If a transistor needs to perform fast switching, a MOSFET should be designed. The transistor design majorly depends on the application it is going to serve. The design process dealing with fabricating transistors on an IC is known as VLSI design (Very-large-scale integration). Such a large number of transistors are embedded in the IC on a very high scale. The typical size of a transistor device is a few millimeters while a transistor fabricated on a chip is extremely small in nanometers! Each integrated circuit (IC) contains billions and trillions of transistors. A transistor could either be a discrete device or embedded inside a microprocessor chip.

The area of the desired transistor must be considered before the initiation of the design process. (Source: bayurov - ) 6 steps for transistor design 1.

Transistor diagram or