Operational Amplifiers - Impedance Converters - Report Writing - Engineering Assignment Help

Assignment Task:

Operational amplifiers (OpAmps) are one of the most important analog building blocks that are used in signal amplification.  Apart from their most common use as amplifiers (both inverting and non-inverting), Operational Amplifiers also find applications as buffers (load isolators), adders, subtractors, integrators, differentiators, logarithmic amplifiers, impedance converters, filters (low-pass, high-pass, band-pass, band-reject or notch), and differential amplifiers. 

In a linear amplifier, the output signal = A × input signal, where A is the amplification factor or “gain.” Depending on the nature of the input and output signals, we can have four types of amplifier gain: voltage gain (voltage out / voltage in), current gain (current out / current in), trans-resistance (voltage out / current in) and trans-conductance (current out / voltage in). Since most op-amps are voltage/voltage amplifiers, we will limit the discussion here to this type of amplifier. The circuit model of an amplifier is  

1. Construct the circuit given in Figure 6 in Multisim (which should be installed in the National Instruments folder in Program Files). 

2. By DC sweeping the input voltage V1 from 0 to 1V in steps of 0.1V and plot the output current through the load RL. Use the curve plotted as such to determine the gain of the amplifier. (Use the DC sweep analysis of Multisim). How do you determine the closed-loop gain from the graph of output current versus input voltage V1? What is the assumption on the output current here with respect to the op-amp? This step represents your simulated results based on an engineering simulation package. You could use other similar packages to compare and confirm the results.

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