circuits_lab_5 - 385L - Laboratory 5 Op-Amps Abstract This...

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385L - Laboratory 5 – Op-Amps – Abstract This lab introduces the open loop gain of op-amps and the characteristics of comparators. It also includes the construction of both and inverting and a non-inverting amplifier. Background An op-amp, short for operational amplifier, is an electronic DC coupled voltage amplifier with high-gain. It typically has high input impedance and low output impedance. Op-amps also usually have a single output which is controlled by either negative or positive feedback. They were originally used for simple mathematical operations like addition and subtraction, but nowadays they are mostly used to obtain regulated amplification through feedback. In our lab we were asked to find the open loop gain of a certain op-amp. Gain is simply a quotient of output to input. Open loop gain is the gain obtained from an op-amp when the circuit at hand uses no feedback. Typically op-amps have an open loop gain in the area of 10 9 . However, this figure falls rapidly with higher frequency. We also used a comparator in this lab. This is an electronic device with finds the larger of two voltages or currents and switches its output to show the result. It is usually faster than an op-amp, but an op amp can also be used as a comparator if it has zero negative feedback. We also constructed an inverting amplifier, which yields an output with a gain of 1, causing a 180
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circuits_lab_5 - 385L - Laboratory 5 Op-Amps Abstract This...

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