Common collector amplifier or emitter follower circuit. Designing a the common emitter amplifier handout the transistor can be used as a voltage amplifier. To build and test a similar circuit, go to experiment 6 in your lab manual. The frequency response will be measured and the dc voltages will be compared to calculated values. Conclusion in this experiment we learned what a common. To study the frequency response and bandwidth of the common emitter cebjt, the common collector ccbjt, and the common base cbbjt amplifiers. To revive your memory, here i bring the ce circuit configuration. Experiment the experiments will be performed with a npn bjt. In the first part, we learned about different biasing setups with it being either fixed or self. For more pspice circuit videos check out my channel and feel free to subscribe. Measure the voltage gain of the amplifier to see how it compares with your. Common collector amplifier or emitter follower circuit and. Engineering 162 laboratory manual spring 2004 5 several of the lab exercises, particularly labs 4, 5 and 7 require measurements of the gain and. To plot its frequency response and to obtain bandwidth.
And why is it much smaller than the main water line that supplies water to your entire town. Ecen 326 lab 1 design of a commonemitter bjt ampli. This satisfies the barkhausen condition for sustaining oscillations and total loop gain of. Our goal in this experiment is to measure av 0, ri, and ro of the ce ampli. Commonemitter amplifiers are also used in radio frequency transceiver circuits. Patil,iitbombay 3 resistance ro ideally zero, and gain av 0. Pdf a bjt common emitter amplifier contents of tables. If the input is a sinusoidal, then the output is also sinusoidal over the dc biasing voltage fig. Common emitter 1 objective design and analysis of analog ampli.
The common emitter ce configuration next, we turn to ce amplifier of fig. Most amplifiers have relatively constant gain across a range or band of frequencies, this band of frequencies is referred to as the bandwidth bw of the circuit. Common emitter amplifier circuit using pspice youtube. Common emitter amplifier working principle and its. Emitter bypass capacitors are used to short circuit the emitter resistor and thus increases the gain at high frequency. Construct common base cb amplifier simulated in the prelab analysis 2.
Commonemitterce and commonsourcecs are the two most widely used con. Bjt amplifiers 6 chapter outline 61 amplifier operation 62 transistor ac models 63 the commonemitter amplifier 64 the commoncollector amplifier 65 the commonbase amplifier 66 multistage amplifiers 67 the differential amplifier 68 troubleshooting device application chapter objectives describe amplifier operation discuss transistor models. Be prepared to discuss your experiment with your ta. Pdf by functioning as a switch and amplifier, the bipolar junction transistors opened the doors. Objectives study and characterize bjt amplifier in common emitter ce configuration. Attenuation network 4 single stage commonemitterce ampli. Common emitter amplifier bjt bipolar junction transistor. Cascade of two ce stages 7 experiment 3 push pull amplifier 9 experiment 4 op amp circuits 11 experiment 5 filter circuits feed back circuit. Construct common emitter ce amplifiers simulated in the prelab analysis. Common emitter amplifier operation figure 2 below shows the biased bjt in ce configuration. Experiment 3 common emitter amplifier free download as pdf file. Design and realize inverting and noninverting amplifier using 741 op amp. The aim of this video is to start a conversation on how best to approach the biasing of a common emitter class a amplifier.
I have been guilty of using several different approaches in the past. It is the most common amplifier configuration of allit is found in analog and digital circuits, from dc through microwaves and it is made of dis. The basic transistor amplifier circuit is indicated below. By reading the above information you have got an idea about this concept. Amplifiers are classified as small signal amplifiers. This article discusses the working of the common emitter amplifier circuit and its applications. The ac signal voltage gain is defined as a v v o v i where v o and v i can both be rms, peak, or peakpeak values.
We also learned how different biased circuits compare and the different uses and formats for a common emitter amplifier. Lets start our discussion on common emitter amplifier ce amp, rather from the first bjt lab, in which we discussed about base voltage and collector voltage in the operating region. The reason for this can be seen from the fact that as the input voltage rises, so the current increases through the base circuit. The single stage common emitter amplifier circuit shown above uses what is commonly called voltage divider biasing. Frequency response of common collector amplifier objective the purpose of the experiment is to analyze and plot the frequency response of a common collector amplifier. Experiment 6 transistors as amplifiers and switches our final topic of the term is an introduction to the transistor as a discrete circuit element. Design the amplifier for voltage gain a v to be at a minimum of 100 vv and choose resistor values of r c and r e by calculation. The commonemitter ce transistor amplifier configuration is widely used. For that we set the quiescent point need to be set with the circuitry external to the transistor, the values of resistors rc and rb, and the dc voltage sources, vcc and vbb, have chosen accordingly. In this prelab, you will explore the design of a single stage ampli. Have your data sheet checked off by your ta before leaving the lab. The object is to solve for the smallsignal voltage gain, input resistance, and output resistance. Common emitter configuration commonly used in lownoise amplifiers. Commonemitter amplifiers give the amplifier an inverted output and can have a very high gain that may vary widely from one transistor to the next.
Measure dc operating voltages at each circuit nodes, voltage gain, input, output impedance of the amplifier and compare the values to the prelab. Experiment 14 common emitter amplifier biasing and gain scribd. Common emitter amplifier biasing calculations youtube. Objective the purpose of these experiments is to introduce the most important of all analog building blocks, the operational amplifier op amp for short. The gain is a strong function of both temperature and bias current, and so the actual gain is somewhat unpredictable. This is mainly because the input impedance is low as it is connected to a forwardbiased. It is called a common emitter amplifier since the emitter is common to both the input circuti and the output circuit.
We will first explain the circuit, show its results on orcad. There are additionally three capacitors but they do not play a role in the basic transistor amplifier design which mainly involves setting dc voltages. This report attempts to characterize the common emitter amplifier circuit by explaining the theoretical basis and. Common emitter amplifiers are the most widely used form of bjt in amplifier. The first input is called inverting represented by, and the other terminal is called noninverting input. Operational amplifier op amp is a three terminal electronic device which has two inputs of high impedance. Experiment 14 common emitter amplifier biasing and gain free download as word doc. This type of biasing arrangement uses two resistors as a potential divider network across the supply with their center point supplying the required base bias voltage to the transistor. Why is the water pipe that goes to your kitchen faucet smaller than the one that comes to your house from the water company. Experiment 6 transistors as amplifiers and switches. It provides large voltage gain typically tens to hundreds and provides moderate input and output impedance. A common base and a common collector amplifier will be designed and tested.
Dc solution a replace the capacitors with open circuits. Background class a stage the amplifier given in fig. In electronics, a commonemitter amplifier is one of three basic singlestage bipolarjunctiontransistor bjt amplifier topologies, typically used as the voltage amplifier. The purpose of this lab is to understand how to design bjt amplifiers in the commonemitter, commonbase and commoncollector configurations. R 1, r 2, r c, r e, must be selected based on design criteria. Pdf on jun 1, 2016, eyad alkouz and others published electronics lab. The common emitter amplifier configuration produces the highest current and power gain of all the three bipolar transistor configurations. This is another video showing how to work with the common emitter amplifier circuit in. The coupling and bypass capacitors cause the fall of the signal in the low frequency response of the amplifier because their impedance becomes large at low frequencies. Since an integrated circuit is constructed primarily from dozens to even millions of transistors formed from a single, thin silicon crystal, it might be interesting and instructive to. A bjt common emitter amplifier contents of tables and figures. In this experiment, transistor type 2n3904 is used.
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