ENGR 1201 Final Project Operational Amplifier Jennifer Medina Bao Tr May 8, 2015 What is an Operational Amplifier? An operational amplifier is fundamentally a voltage amplifying device designed to be used with external feedback components such as resistors and capacitors between its output and input terminals. These feedback components determine the resulting function or operation of the amplifier and by virtue of the different feedback configurations whether resistive, capacitive or both, the amplifier can perform a variety of different operations, giving rise to its name of Operational Amplifier. In our project, we used three terminal device which consists of two high impedance inputs, one called inverting input that is marked as a negative or a minus (-), and the other one that is positive that is called non-inverting input that is marked with a plus or positive sign (+). The third terminal represent the Operational Amplifier output port which can both sink either voltage or a current in our case we used voltage. Objective: The objective of this project is to understand exactly how a basic operational amplifiers works. Also, to be able to read basic electrical circuits. Apparatus used: Resistors, connecting wires, batteries, digital oscilloscope, voltmeter, an electronic learning lab, speaker, connecting cables, DC power supply, capacitors, and a bug. Concepts · Voltage – Voltage “in” and Voltage “out” · Current – Current “in” and Current “out” · Trans conductance – Voltage “in” and Current “out” · Trans resistance – Current “in” and Voltage “out” · Resistor · Battery · Ground · / · Wave graph The presented circuit diagrams where the ones use for the project. Circuit diagram #1 V DD Vout Rin Vin RF VDD Vout Vin Rin RF Circuit diagram#2 Vin V out RF Rin AC source 8 6 3 5 7 2 4 1 Data: This image we see the actual circuit done in the electronic learning lab. This match exactly with our circuits shown before. These second images we can see a picture of the oscilloscope proving the theory of operational amplifiers. The yellow waves is the initial signal and the green waves are the output signal. As one can see the yellow is a very small signal compare it to the green one. The green one is inverted and has a larger amplitude, but they both have the same frequency. In this particular image one can see what happened when we increase the RF (resistance) RF varies that is why it has a cross line in our circuit diagram #2. However, RF is just affecting the output result the input is till will be the same In this image we increase the Voltage and we reduce the resistor, but because we did this our PK-PK also increases. This still just affect the output, the input still the same and the frequency of both channels is till the same. Something very important that happened whil ...