ktuedalab

RC Coupled Amplifier Dr. Hari V S Department of Electronics and Communication College of Engineering Karunagappally What You will Learn You will understand the design of RC coupled amplifier. You will appreciate its frequency response and understand the variation of voltage gain at low and high frequencies. You will understand the effect of emitter bypass capacitor (or rather the effect of current series negative feedback) on the voltage gain and frequency response of the amplifier. You will understand the concept of stability of amplifier by analyzing the Nyquist plot and understand how negative feedback improves the stability. Objectives To design and implement RC coupled amplifier and to observe voltage amplification both in Qucs and on breadboard. To plot its frequency response curve and to compute the bandwidth with and without feedback. Design Let $V_{CC}=15V$, $\beta=200$ and $I_{C}=5mA$. For active region

Output Characteristics of n - Channel MOSFET Dr. Hari V S Department of Electronics and Communication College of Engineering Karunagappally Objectives To plot the output characteristics of n- channel MOSFET. To compute the drain resistance Experiment Output characteristics indicate the variation of the drain current ($I_{D}$) with the drain to source voltage ($V_{DS}$) for different gate to source voltages ($V_{GS}$). Wire up the ciruit in QUCS schematic editor as shown below. Run the simulations and observe the output characteristics as shown below. Select a characteristics and draw a tangent in the saturation region and compute the drain resistance as \begin{equation} r_{d}=\frac{\Delta V_{DS}}{\Delta I_{D}} \end{equation} for the given $V_{GS}$ Observations Drain resistance = $\ldots\ldots\ldots\ldots\ldots\ldots\ldots\ldots\,\Omega$ What You Learned You understood the output characteristics of $n

Common Base Transistor Characteristics Dr. Hari V S Department of Electronics and Communication College of Engineering Karunagappally What You will Learn You will learn the operation of common base transistor stage. You will learn the experimental set up for plotting the current voltage characteristics at the input and output of a CB stage. You will learn to find out the common base short circuit current gain ($\alpha$), the input impedance ($r_{i}$) and output impedance ($r_{o}$) Theory The collector current of an actively biased CB (meaning that base is at ac ground) transistor, in terms of the emitter current and reverse saturation current is \begin{equation} I_{C}=-\alpha I_{E}+I_{CO} \end{equation} where $\alpha$ is the common base short circuit current gain. The short circuit current gain in the common emitter configuration. Input characteristics are plots of input current ($I_E$) vs. the input voltage ($V_{EB}$) for different

Common Emitter Transistor Characteristics Dr. Hari V S Department of Electronics and Communication College of Engineering Karunagappally What You will Learn You will learn the theory of common emitter transistor configuration and the corresponding collector current equation. You will understand the common emitter short circuit current gain ($\beta$). You will learn the input and output characteristics of common emitter BJT. You will understand the experimental set up for plotting the characteristics and draw the characteristics. Objectives To plot the input and output characteristics of common emitter BJT. To compute the short circuit current gain ($\beta$), input impedance ($r_{i}$) and output impedance ($r_{o}$). Theory The collector current of an actively biased CE (meaning that emitter is at ac ground) transistor, in terms of the emitter current and reverse saturation current is \

V I Characteristics of Diodes Dr. Hari V S Department of Electronics and Communication College of Engineering Karunagappally What You will Learn You will plot the V-I characteristics of Si and Ge diodes and understand the difference in cut in voltage and slope of the characteristics. Theory Semiconductor diode is a $p-n$ junction that conducts well on forward bias and conducts very little on reverse bias. The relation between diode current and voltage is \begin{equation}\label{diodeeqcurrent} I=I_{o}[e^{\frac{V_{D}}{\eta V_{T}}}-1] \end{equation} where $I_{o}$ is the reverse saturation current, $V_{D}$ is the voltage across the diode and $V_{T}=\frac{kT}{q}$. $k$ is the Boltzmann constant and $T$ is the absolute temperature. The ideality factor $\eta$ varies from $1$ to $2$. Experiment - Forward Characteristics Qucs is launched and the components in the schematic, shown below, are entered into the editor. A Si diode

RC Integrator and Differentiator using QUCS Dr. Hari V S Department of Electronics and Communication College of Engineering Karunagappally What You will Learn You will understand the operation of simple integrator and differentiator circuits using QUCS You will learn the frequency response characteristics of integrator and differentiator by dint of ac simulation. Theory Differentiator is a high pass circuit that produces the time derivative of the input signal at the output. The circuit is shown below. \begin{equation} \nonumber v_{o}=I_{o}R=RC\frac{d(v_{s}-v_{o})}{dt}\\

SPICE Simulation of Voltage Divider Dr. Hari V S Department of Electronics and Communication College of Engineering Karunagappally What You will Learn You will wire up a voltage divider network using QUCS You will learn to perform DC, AC and transient simulations on the developed circuit. you will learn to observe, store and export the data from the display ( .dpl ) file. Experiment Launch QUCS. Go to Components in the left pane and select the item Lumped Components . Drag and drop a resistor onto the schematic window. Right click on on to and go to Edit properties and make the resistance 1 k&#937 Right click, copy and paste this resistor twice. Connect the three resistors in series by wires, selected by pressing Cntrl+E . Go to Components in the left pane and select Sources &#8594 ac Voltage Source . Drag and drop the source onto the schematics window. Right click on the source and change

Overview of EDA Tools Dr. Hari V S Department of Electronics and Communication College of Engineering Karunagappally What You will Learn You will familiarize the SPICE tool QUCS Quite Universal Circuits Simulator(QUCS) Quite Universal Circuits Simulator(QUCS) is an open source circuit simulation software, based on SPICE, that is built on the QT4 platform, that is especially useful in the simulation of high frequency circuits. The schematics of analog and digital circuits can be entered into the schematics editor and wired together and be subjected to the following simulations. DC simulation Transient simulation AC simulation S-parameter simulation Parameter sweep simulation Harmonic balance Digital simulation Optimization Installation of QUCS QUCS is installed on Ubuntu using the instructions here The executables for Qucs for Windows can be do