Transistor Amplifier Design Calculator

In transistor literature there are two different types of gain parameters with the same three letters.

Transistor amplifier design calculator. This calculator will compute the values of the biasing resistors required to provide the maximum output voltage swing in a npn bipolar junction transistor bjt amplifier circuit. The following calculators will compute all of the bias values of the transistor circuit given the supply voltage and the base voltage and all of the resistor values. The most basic form of common emitter amplifier design is the simple logic buffer output consisting of a transistor and a couple of resistors. The beta and vd transistor parameters can be measured or gathered from a data sheet.

Small case h fe represents the small signal current gain or ac gain and we do not use this parameter when using the transistor as a switch. Transistor amplifier calculator reply 6 on. Bjt transistor as a switch saturation calculator. The base of the transistor used in a common emitter amplifier is biased using two resistors as a potential divider network.

This type of biasing arrangement is commonly used in the design of bipolar transistor amplifier circuits and greatly reduces the effects of varying beta b by holding the base bias at a constant steady voltage. The prototype amplifier for this exercise used a npn small signal transistor such as the 2n3904 but other similar transistors should work equally well. This can have a few extra components added to enable it to become an ac coupled amplifier with dc biasing and emitter bypass resistor. Data entry is on the left a representative schematic is in the middle and results are on the right two areas.

February 11 2013 043417 pm ive had a little project on the back burner for some time ive been meaning to write up a whole bunch of little useful electronics calculators not just like the little ones you see scattered around that are no more convenient than a pocket calculator and put them in a collection online. Our calculator determines the math of transistors based on data entered. Given a amplifier or transistors the s parameters scattering parameters this calculator will analyze its stability maximum gain an even suggest a suitable conjugate l matching network for a given load and source impedance of the circuit to which the amplifier will be connected. This is a simple design tool for calculating bias resistor values small signal gain and inputoutput resistances of a common emitter bjt amplifier.

The parameter h fe represents the dc gain and this is the parameter to considerwhen selecting the h fe value for transistor switching purposes we. The algorithm makes use of ac and dc load line theory and formulas and is one of the most accurate you will find online.