Calculation and searching for an operating point

Calculation and searching for an operating point / Calculation and searching for an operating point Completed

Creating circuits is similar to the standard Altium Designer steps.

Values of electronic components can be specified in three ways:

Specify a certain value, for example: R7, V1;

Using a calculation function (formula), for example: R1, R2, R6;

Using global variables. This method will be described later.

Fig. 1 - Completed circuit — **Fig. 1** - Completed circuit

DC Sweep analysis

The application will be shown on the example of searching for a specific value of the quiescent voltage at the circuit output. For this purpose, we need to see how the R7 resistance change affects the desired value.

Let's configure DC Sweep calculation:

In the Simulation Dashboard panel in the DC Sweep region, specify the range of R7 from 100 Ohms to 1000 Ohms with 1 Ohm step;
In the Output Expression field, specify the component group in the schematic that you want to analyze: V(out);

Fig. 2 - Settings DC Sweep analysis — **Fig. 2** - Settings DC Sweep analysis

Next, run the calculation.

Fig. 3 - The value of the collector resistor — **Fig. 3** - The value of the collector resistor

After completing the calculation, use the cursor to find the value of the collector resistor at which the voltage at the output of the stage will be 7V -> 596 Ohm.

Enter this specific value into the value of the collector resistor in the circuit.

Good job! Article is now completed!

Completed Completed

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