Why is there a "spike" instead of curve for the sine curve? The circuit is as below

 

This is not caused by the circuit but by the deficiencies of the 'instrument' displaying the voltage.
What are you using to simulate this circuit?

 

Try reducing the size of the Maximum Timestep in the transient test parameters.
Start with 10 microseconds or so.
Here's an article on that for PSpice.

 

This is not caused by the circuit but by the deficiencies of the 'instrument' displaying the voltage.
What are you using to simulate this circuit?

The circuit was in Capture and waveform in PSpic A/D Lite

(Student Version)

 

Try reducing the size of the Maximum Timestep in the transient test parameters.
Start with 10 microseconds or so.
Here's an article on that for PSpice.

Hi. Thanks, I try to set the TRTOL to 1 as suggested by the article, but it's still the same. the Max Timestep is altered as well,

 

Try a Maximum Timestep of 1μs and see if that makes a difference.

 

Try a Maximum Timestep of 1μs and see if that makes a difference.

Yes it works! Thanks