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Lab Report 1 - Diodes and Operational Amplifiers

# Lab Report 1 - Diodes and Operational Amplifiers - Scott...

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Scott Smith ENEE306 26 September 2005 Lab Report Lab 1: Diodes and Operational Amplifiers B ACKGROUND T HEORY The diode will only allow current to flow in one direction. For the purposes of this lab, the constant voltage drop model will be employed for the diode. This means that the voltage drop across the diode will be assumed to be 0.7 V . Due to the inherent properties of the diode, it can be used for rectifying a sine wave signal. There are two types of rectifiers: half-wave and full-wave. Each of these has different properties that are explored in this lab. The full-wave rectifier is used in DC power supplies. Op-amps have the ability of amplifying the voltage of a signal. There are certain limitations to each op-amp that will be explored in this lab. The non-inverting op-amp only amplifies the voltage of the signal. The inverting op-amp amplifies the voltage of the signal and puts the signal 180 ˚ out of phase with respect to the input signal. The amount of gain with each of these op- amps is controlled by the resistor values. O BSERVATIONS Experiment 1.2.1 – Simple Half-Wave Rectifier Step 1: The input voltage is a full sine wave while the output is a sine wave without the negative half. The peaks of the half-wave are 0.7V less than the input peaks. Experiment 1.4.3 – Simple Op-Amps Step 1: The signal generator at our station would not allow the amplitude of the sine wave to go below 1.2 V so we could not achieve the 1.0 V specified in the lab manual. Step 2: The signal generator would not go below 0.14 V so we could not achieve the 0.1 V as specified in the lab manual. Step 4: The signal voltage could only be returned to 0.2 V amplitude. Step 5: Using resistors from the 1 k to 100 k range did not give any noticeable difference on the oscilloscope. We had to use a 510 resistor to get a noticeable voltage drop on our oscilloscope.

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