To simulate a cascode amplifier circuit.
Transistor – BC107A (2), Resistor- RC05 (6), Capacitor- CC0805 (4), AC voltage source- VGEN (1), DC voltage source- VDC (1), Ground- SPL0 (4)
Draw the circuit diagram after loading components from library. Assign net names for connections wherever necessary. Preprocess the circuit by invoking Simulation --> Preprocess. Place waveform markers on input and output nodes. For placing waveform markers, select Tools --> Instruments --> set wave form Contents --> Voltage waveform --> Click on the required net and place the waveform marker. Run transient analysis after setting up required parameters.
To proceed with the simulation, the steps are as follows
Select Tools --> Components --> Component properties--> Change simulation parameters--> Click on the required component and change its values.
The values to be provided to the components are
Transistors : BC107A (2) (Click on the Set up Model of the Model Type. Click on Accept to get the default values assigned)
Resistors : 33k, 22k, 12k, 1.2k, 560 ohm, 330 ohm.
Capacitors : 15µF (3), 22µF
VDC/1 : 12V
VGEN : Select the source function as SIN and set its Properties as follows
VA (amplitude) : 100mV
FREQ (frequency) : 100Hz
For setting up simulation time and analysis types, select Simulation menu, choose Analysis. In the window pops up, select Transient analysis from tree view.
Enter following values:
Step : 100µ
Final time : 50m
Results : Select Waveform from drop down menu.
Click on Accept. Expand the Transient Analysis and select Waveform viewer, Select As Marked. Click on Accept. Select Transient Analysis. Run Analysis by clicking on Run button.