QSpice (10) -- Quick Operation
Hello uu, happy vacation! Where did you go?
I injured my waist the day before the holiday, and started my return journey today. On the way, I watched some QSpice videos and shared them with you.
First, we build a basic simulation diagram, which can be said to be a simulated Hello World. The basic RC filter circuit is shown below.
Figure 1: Basic RC filter circuit
Use the scroll wheel to adjust parameters
——Simulation code 1——
R1 N01 OUT 464
C1 OUT 0 10n
V2 N01 0 PULSE 0 5 1m 1n 1n 3u 5u
.TRAN 8m
.end
——Simulation code 1——
Sometimes we need to see different values to see how well the RC circuit filters. Usually we can use Step simulation, but QSpice provides a simpler method to use the scroll wheel to adjust the device parameters. The specific steps are as follows:
- Double-click the device parameters
- Hold down the Alt key
- Scroll up or down
- Wait for simulation results to change
Figure 2: Basic RC filter circuit and simulation results
Because it's not a Gif, it won't move. Can you recommend me a free tool to record Gif?
Restore drawings using netlist
In the use of Spice, many devices are provided in the form of .sub or .lib library, but it is still a black box for users. We only know how to use it, but we don’t know how to implement the device. It is still difficult to understand the circuit directly by looking at the netlist. The more complex the circuit, the greater the difficulty, so it is best to graph the circuit.
We borrow the code from simulation code 1 and use the built-in functions in QSpice to restore this drawing. The steps are as follows:
Step 1: Create a new drawing
Step 2: Copy the simulation code
Step 3: Hold down Shift and then press Ctrl + V
Figure 3: Drawing after pasting
Using the above method, you can restore the drawing by arranging the connections corresponding to the network labels, and the simulation effect is the same as the original drawing simulation effect. For the Sub circuit library, we can also better understand how it is implemented internally.
Import CSV Analysis
The purpose of simulation is to verify and compare with the actual circuit, and to develop a sense of the circuit. Since I have done the simulation, how do I know if my simulation is correct? Usually the data of the oscilloscope can be exported in CSV format. We can import the data in CSV format into QSpice to see if it corresponds to the simulation.
It should be noted that the data in CSV format should correspond to the simulation data format. The data format exported by QSpice is shown in Figure 4 below.
Figure 4: CSV data exported by Qspice
We create a new data, this data is equal to V(OUT)*2, as shown in Figure 5. After modification, save it, directly use QSpice to open the CSV and add the waveform, as shown in Figure 6, we can see that the voltage amplitude of the waveform is exactly twice.
Figure 5: V(out2) data
Figure 6: Viewing the CSV waveform
That’s all for today, ┏(＾0＾)┛
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