5.2 DC Sweep Analysis

1. Select input port 'in' from the schematic. Then from the main menu bar:
   Setup -> Analysis...

   A dialog box will appear as shown in Fig 5-4. Click on 'DC Sweep' for DC sweep analysis. Enter '0' in the 'Start Value' field and '5' in the 'Stop Value' field. Then click on 'OK'.

   

   Figure 5-4. Setup Analysis dialog box.

   Note:If you are familiar with Spice netlist, you can check the netlist by selecting from the main menu bar:
   Report -> Netlist

2. Before you run your circuit, remember to keep the data of all the circuit nodes by selecting from the main menu bar:
   Add -> Keeps...

   Click on 'All' for the 'Add Keeps' dialog box then click on 'OK'

3. To run your circuit, click on 'Run' icon from the right side palette. A dialog box will prompt for signals that need to be kept. Accept all the default settings by clicking on 'OK'.

4. It takes a couple of seconds to run the simulation. After that, select output port 'out' from the schematic. Click on 'Chart' on the right side palette. The output waveform chart will be created in another window as shown in Fig. 5-5.

   

   Figure 5-5. Result waveform of input v.s. output voltage.

5. To see the relation between input voltage and current drawing from the VCC, select from the main menu bar: Results -> WF Processor

   WF Processor windown will appear as shown in Fig. 5-6.

   

   Figure 5-6. WF Processor window

6. Select 'Y' and click on 'I', move cursor to schematic window. Select the net connected to 'VCC'.

7. Select 'X' and click on 'V', move cursor to schematic window. Select the input port 'in'. Then click on 'Chart'.

8. Another dialog box will prompt for the place to put your chart as shown in Fig. 5-7. Select 'Existing Chart' for 'Chart to' field and select 'New' for 'Y-axis' field.

   

   Figure 5-7. WF Processor dialog box

9. Click on 'OK', then click again on the existing chart window. The current v.s. voltage chart will be added on the chart window as shown in Fig. 5-8.

   

   Figure 5-8. Add chart to existing chart window

6. Reload Design Changes in Accusim

To reload design in Accusim after modifying it, select:

from main menu bar. Then click "OK" to execute.

7. Printing

1. Make the waveform window active by clicking on it.

2. Select from the main menu bar:
   File -> Print -> Active Window

3. Enter the printer name for the 'Print Chart' dialog box then click on 'OK'.

   Note:If you are users of SCU Design Center, please enter 'laser' for laser jet print out. For users outside SCU Design Center, please contact your system administrator for printer name.