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# exp5 - Measuring Amplitude Response Julian Weathersby...

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Measuring Amplitude Response Julian Weathersby Course: AME341 Lab Date: Tuesday, October 16, 2007 Lab Partner: Jeremiah Givens

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Julian Weathersby Measuring Amplitude Response Introduction An op-amp, also known as an operational amplifier, is a high-gain electronic voltage amplifier. The purposes of an op-amp are to match measurement resolution, improve the ratio of the signal to the noise, and to provide impedance matching. This lab is designed to test and experiment an op-amp and to analyze how an op-amp works. The measured value for an op-amp is the op-amp gain, G, which is the low frequency |H| and is given by the equation G =| H |= R f R i (1) where R i is the input resistor and R f is the final resistor. The op-amp gain is also G =| H |= e o e i (2) where e o is the output voltage and e i is the input voltage. The output voltage is measured at a given frequency and input voltage. The frequency response is dependent on the input signal in both open loop and feedback configurations. An important measurement is the corner frequency, ϖ o, which is ϖ o = 2 pf o = R i R f A m (3) where A is the gain and μ is the time constant. The corner frequency is found from the bandwidth, ϖ *, which is the equation ϖ * = A m (4) Along with the bandwidth is the Gain-Bandwidth Product or GBP, which is the following GBP = Gw o GBP = R f R i R i R f A m GBP = A m (5) All five equations are used to properly analyze an op-amp. What were to be found was the corner frequency, the op-amp gain, the bandwidth, and the Gain-Bandwidth Product of a LM741 op-amp.
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exp5 - Measuring Amplitude Response Julian Weathersby...

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