Hi Peter,
To simulate the R-C circuit in Simulink and observe the voltage change due to a small change in capacitance, you will need to configure the Simulation Parameters. In "Model Configuration Parameters" :
- set the "Stop Time" to a value that allows you to observe several periods of the sine wave, such as 0.001 seconds (1ms),
- set the "Solver" to a suitable type, like "ode45 (Dormand-Prince)" for a more accurate result.
- set the "Max step size" to a small value to capture the small changes, such as 1e-7 seconds.
To see the small change in voltage due to the 0.5 pF change in capacitance, you may need to zoom in on the Scope plot or adjust the Scope settings to increase the Y-axis resolution. Simulink's visualization tools might not be sensitive enough to clearly show such a small change in the voltage directly. If you cannot see the change, you can log the data to the MATLAB workspace and use MATLAB's plotting functions to get a more detailed view of the voltage changes.
