Jul
18
Transistor as an amplifier

In this amplifier tutorial section we looked at the amplifier circuit based on a single bipolar transistor as shown below, but there are several different kinds of transistor amplifier circuits that we could use. Applications II: Amplifiers. Some of the most powerful transistor applications involve amplification: turning a low power signal into one of higher power. Or they can amplify current, useful for . Want to know how to use transistors as an amplifier ? Read about common emitter amplifier circuit diagram in detail and calculate common emitter voltage gain at. Emitter (E), Base (B) and Collector (C) and thus has two junctions viz.

Transistor as an Amplifier. Base-Emitter (BE) junction and Base-Collector (BC) junction as shown by Figure 1a. Such a device can operate in three different regions viz. Because an amplifier must have two input and two output terminals, a transistor used as an amplifier must have one of its three terminals common to both input and output as shown in Fig 3. The choice of which terminal is used as the common connection has a marked effect on the performance of the amplifier. The aim of this experiment is to develop a bipolar transistor amplifier with a voltage gain of minus.

The bandwidth should extend. The common emitter amplifier configuration is possibly the most widely used form of transistor circuit providing voltage gain. Read this post to get an idea about how to use transistor as amplifier.

For a transistor to act as an amplifier, it should be properly biased. We will discuss the need for proper biasing in the next chapter. Here, let us focus how a transistor works as an amplifier.

A transistor acts as an amplifier by raising the strength of a weak signal. The DC bias voltage applied to the emitter . In the last section we saw how transistors behave within their “active” modes, between the far limits of saturation and cutoff. Because transistors are able to control current in an analog (infinitely divisible) fashion, they find use as amplifiers for analog signals. One of the simpler transistor amplifier circuits to study previously . In order to build an amplifier , all you need are a transistor , a power source, some resistors, and some capacitors.

There are many ways to mix these together, which is an art (Steve Jobs often called laying out circuits digital art), but we will give you some basic conditions and assumptions to work with and then walk you. A simple explanation of how a transistor works in a circuit, and how to connect transistors to create a number of different circuits. No mathematics and no complex wording.

Just a completely different approach you can understand. An ideal amplifier has infinite input impedance (Rin = ∞), zero output impedance (Rout = 0) and infinite gain (Avo = ∞) and infinite bandwidth if desired. The transistor , as we have seen in the previous chapter, is a three-terminal device.

Representing the basic amplifier as a . Figure illustrates a typical single- transistor amplifier circuit. These include bipolar junction transistors ( BJTs) and metal oxide semiconductor field-effect transistors .