Parametric Sweep—Op-Amp Gain Bandwidth

In this section we will use PSpice to determine the bandwidth of an op-amp circuit with varying amounts of negative feedback. For an op-amp circuit, the closed-loop gain times the bandwidth is approximately constant. To observe this property, we will run a simulation that creates a Bode plot for several different closed-loop gains. We will use the circuit below  

This circuit uses a LF411 op-amp macro model. All op-amp models, except the ideal op-amp model, include bias currents, offset voltages, slew rate limitations, and frequency limitations. Also note that the op-amp model requires DC supplies. The 

In this simulation we would like to change the gain of the circuit by changing the value of RF. To do this, we will define a parameter called RF val and use this as the value for RF. First, we must define the parameter RF val using the PARAMETERS part. Double-click the LEFT mouse button on the text PARAMETERS to obtain the spreadsheet for this part  

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