- Homework Statement
- Relevant Equations
I use this netlist and simulation result came out as shown. I need to find the dc gain here and circuit diagram, but I'm not sure how. I would be very grateful if you could give me the answer.
OK, but I suspect your professor is an idiot, schematics are how we communicate in electronics, JMHO. For a simple circuit like this we can usually read the DC gain as the ratio of some resistors, without any simulation.song youngill said:I'm sorry, but I don't have data on the schematic. Because of the professor's instructions, I only have the netlist, and I have to run the simulation through it and find out the results. The result of the ac simulation is like the picture, and I don't know how to find the dc gain here.
100 dB can be the voltage gain. The input is AC 1 volt.song youngill said:But 100dB itself can't be gain, ...
Maybe not. I think the schematic is not given in the hope that the student will create a schematic by learning to decypher the spice source code using the help files. It is worth the exercise.song youngill said:I very much agree that the professor is an idiot.
The purpose of finding DC gain via AC simulation in LTspice is to determine the voltage gain of a circuit at different frequencies. This allows for the analysis of a circuit's frequency response and can be useful in designing filters, amplifiers, and other electronic systems.
To perform an AC simulation in LTspice, you must first set up your circuit in the schematic editor. Then, click on the "Simulate" menu and select "Edit Simulation Command". In the dialog box that appears, change the "Analysis type" to "AC Analysis" and enter the desired frequency range and step size. Finally, click on the "Run" button to start the simulation.
To calculate the DC gain from the AC simulation results, you will need to plot the output voltage versus the input voltage on a logarithmic scale. The DC gain can then be determined by finding the slope of the linear portion of the plot. Alternatively, you can use the cursor tool to measure the voltage gain at a specific frequency.
Yes, you can perform an AC simulation on a circuit with nonlinear components in LTspice. However, the results may not be accurate as LTspice uses linear approximations for these components. It is recommended to use a more advanced simulation tool for circuits with nonlinear components.
To improve the accuracy of your DC gain calculation in LTspice, you can increase the number of frequency points in the AC simulation or use a smaller frequency step size. Additionally, you can use the ".OPTIONS" directive in the LTspice netlist to specify a higher precision level for the simulation.