What are the two rules that we use for a simplified analysis of transistor circuits?

3.9. 1 Transistor Properties and Rules

• Rule 1: The collector voltage must always be greater than the emitter by approximately 0.2V.
• Rule 2: The base-emitter and base-collector circuits in a transistor act like diodes.
• Rule 3: Transistors all have maximum current and voltage ratings.

What is beta gain transistor?

β (beta) of a transistor is the gain or amplification factor of a transistor. It is the factor by which current is amplified in the circuit. So if a transistor has a β of 100, the base current that goes into it is amplified by 100.

What is the value of beta for a transistor?

The value of Beta for most standard NPN transistors can be found in the manufactures datasheets but generally range between 50 – 200. The equation above for Beta can also be re-arranged to make Ic as the subject, and with a zero base current ( Ib = 0 ) the resultant collector current Ic will also be zero, ( β x 0 ).

What is the current gain of a transistor?

Also, the current gain of the transistor from the Collector terminal to the Emitter terminal, Ic/Ie, is called Alpha, ( α ), and is a function of the transistor itself (electrons diffusing across the junction).

What is the base bias voltage of an NPN transistor?

Where: Ib is the base current, Vb is the base bias voltage, Vbe is the base-emitter volt drop (0.7v) and Rb is the base input resistor. Increasing Ib, Vbe slowly increases to 0.7V but Ic rises exponentially. An NPN Transistor has a DC base bias voltage, Vb of 10v and an input base resistor, Rb of 100kΩ.

What is the β value of a 2N3904 transistor?

Most transistors have a value of β ≅ 100. In this week’s laboratory, you will measure β for a 2N3904 transistor. In an npn transistor, a current will flow from the base to the emitter only if the base voltage is positive with respect to the emitter.