Contents
Do you need to set a signal source for LTspice?
LTspice requires setting of the signal source when simulating. In this article, we will focus on how to set up a independent voltage source for analysis. For the types of analysis, please see the following article.
Can you graph the input voltage In LTspice?
You can graph the input and/or the output voltage, but you have to use the WaveForm Arithmetic to graph V (in)-V (out). To do this, you need to know both LTSpice node names involved.
How to parameterize capacitance In LTspice schematic?
In LTspice parameters are variables that can be reused throughout the schematic. They are defined with the.op SPICE directive “.param = “. For example, we can parameterize the capacitance C1 in this simulation with the following modifications to the schematic. parameterized capacitance in the R-C circuit
Where to find ltspiceparamtersweep in spice log?
In this case, LTspice will measure and record the average ( AVG) value of signal V (o) and save it into a variable named Vout. These measurements aren’t directly available for plotting, however. Instead, we need to find them in the SPICE log, under View >> SPICE Error Log.
How is error voltage amplified in LTSpice simulation?
The output is then divided by the feedback resistive divider and compared to a reference voltage at the feedback pin. The difference between the divided output and the reference voltage is the error voltage. This error voltage is amplified the the error amplifier to be a current which flows out of the error amplifier.
How is Fra used in LTspice IV simulation?
The technique of using injected test signals and Fourier analysis is called Frequency Response Analysis (FRA). While this method is routine in the lab, not everyone is aware of how to use it simulation. This article explains how to do FRA in LTspice IV.
How can I plot voltage gain ( VOUT / VIN )?
How can I plot voltage gain (Vout/Vin) when Vout can have some DC offset? Since you are working in a simulation why not take the easiest approach. Add a capacitor from the output and connect the other side to a large size resistor that goes to GND. Then take your reading of output AC voltage across the large size resistor.
How do you change the name of LTspice?
LTSpice labels components as R1, R2, R3, C1, C2, C3 and so on. You can change them for easeof recognition to things like Rc, Rb1, Rb2, Load and so on. Right click the label and type inyour new name.
How do you clear the resistor on LTspice?
Start LTSpice and press the new document icon on the left, a sheet of paper with the LTlogo on it. Press the ‘R’ key or click the resistor icon. Use your mouse to move the resistor to thetop center of the page, about one dot below the top, and click. Press ESC to clear theresistor mode.
How is the resonant frequency measured in LTspice?
It’s ugly, because no special care has been taken care of — it’s an exponentially decaying waveform, not an exact number of periods, compression is on, no imposed timestep, bla, bla — for which the cursor reads 1.6Hz. Given the resolution, it’s close enough to 1.59 Hz.