Essays on Emitter

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Results:

Based on measurements, complete the table below: Discussion: Discuss the application of common collector transistor circuit. The common collector configuration of the BGJ amplifier is mostly commonly employed as buffer or emitter follower. The voltage gain of the common collector amplifier is nearly unity and provides large current amplification. It is used in applications where current sourcing is required without modifying the voltage. The input resistance is quite high so it draws negligible current from source. Moreover, the load circuit will not interfere ...

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Discussion:

Using the measurements made in the procedure, calculate the quiescent current IE, and the internal emitter resistance re. The quiescent current IE and internal emitter resistance re can be calculated using the DC analysis carried out in Step#1 and Step#2 of the procedure. The DC voltage measured across RE is used to measure the biasing current across the emitter of BJT. The voltage is measured to be 793mV. Since RE = 1KΩ, so: IE=VERE=0.7931000=0.000793A=0.793mA.

Now, we can calculate the internal resistance of emitter using the formula provided in the procedure. So:

re=0.026IE=0.0260.000793=32.786Ω

Using the values obtained in the experiment; draw the small-signal ac equivalent circuit for the amplifier.

In this part, we will draw the small scale ...

Energy has played an important role in building the world economy today. From enabling man to perform daily activities to enhancing the functioning of many industries, it is sensible to state that energy is of great importance to the world. Due to its importance, fossil fuels such as coal have thus been burnt down to create energy. However, different negative effects are associated with burning such fuels to the environment. For instance, global warming gasses are emitted thus, causing global warming as a result of carbon monoxide, which is emitted while burning coal. Despite their disparities, both developed and ...

Introduction

The Wide-Band Code Division Multiple Access (W-CDMA) is a third generation handset system that achieves high data transmission by utilizing a wider spectrum frequency. Issues that arise in handsets such as a low spectral growth and maintenance of modulation accuracy require a low adjacent channel leakage power ratio (ACLR) especially in the case of the W-CDMA handset systems. High linearization in the portable W-CDMA systems can be improved by increasing the gain compression point that creates the AM-AM distortion. As such this can be achieved by using an on-chip linearizer. A new on-chip active bias circuit can be used ...

Abstract

In this article, a new bias current regulation circuit of a one-stage bipolar and Filed Effect Transistor amp is described. How the FET achieves high precision and simplicity by means of a combination of feedback error amplifier with a bandgap reference is explained.

Introduction

Regulating current through active devices sets the output level in a drive circuit. Figure 1. Below shows typical application of these active devices. Qo I used as a FET rather than a BJT. In a limiting amp, the Qo acts as a switch and the output signal level is proportional to the bias current. The gain ...

1.0 Lab 1: Heating Value Measurements: Solid and Liquid Fuels with a Bomb Calorimeter 1.1 Introduction Measurements of heating values can be derived for both solid and liquid combustible fuels using an Oxygen Bomb Calorimeter. The calorimeter measures heat. Heat is not the same thing as temperature. The heat of combustion is called the calorific value. The calorific value is “:the number of heat units liberated by a unit mass of a sample when burned with oxygen in an enclosure of constant volume” (Introduction 2007). The experiment uses the 6100 Bomb Calorimeter. The definition of calorific value in a bomb calorimeter ...

Lab Report: Common Emitter Amplifier

Acronyms and Abbreviations AC Alternate Current BJT bipolar-junction-transistor DC Direct Current mA milliAmps

PNP Positive-Negative-Positive

Q point Quiescent Point RF Radio Frequencies Lab Report: Common Emitter Amplifier

Introduction

A laboratory was conducted to evaluate the characteristics of a common emitter amplifier. The configuration is a bipolar-junction-transistor (BJT). Transistors allow current to flow from positive to negative states or from negative to positive states. A transistor board was supplied for the experiment. Five activities were done during the lab: a DC analysis, An AC analysis gain at midband (with bypass capacitor in circuit), AC analysis gain at midband (with no ...

Introduction

A voltage stabilizer is an electronic gadget found in most of the circuit board of home electronics. A voltage stabilizer can be found in computers radios phone chargers and also DVD players. This important gadget comprises of diodes, capacitors, transistors, resistors and a step-down transformer. The work of a voltage stabilizer is to provide a steady current to the electronic equipment for it to function efficiently. A simple model of a voltage stabilizer looks like the diagram below. Symbols have their usual meaning. In the above diagram, a step-down transformer reduces 240V of alternating current to around 10V of alternating current at the ...

Cut Off Region of a Transistor

The transistor goes into the cutoff region when the base current (IB) is equal to zero. The collector leakage current ICEO under such conditions is quite low due to the effect of thermally-generated carriers. This means that ICEO can be neglected in the circuit analysis such that VCE will be equal to VCC. During the cutoff region, both the base-collector and the base emitter junctions are reverse biased. Subscript CEO means a representation of the collector to emitter with the base open. This is represented in the circuit below.

Saturation Region of a Transistor

Forward biasing of the base-emitter junction increases the base current. Consequently, ...

The following paper describes the current developments and advances in the use and application of smart packaging technology in food packaging processes. The paper focuses on the application of the technology through various methods of smart food packaging, process designs, equipment used and the current applications. The paper also gives the various applications for the smart food packaging technologies.

Oxygen Absorbers

Oxygen absorbers/scavengers refer to smart packaging technologies that work by absorbing oxygen from foods while reducing oxygen metabolism in the packaged food (Latou et al. 2010). The process is designed to decrease oxidative rancidity and stop any unintended oxidation of ...