[Cam Design] Constant acceleration problem

Hi all,

I wish to design a circular cam can perform constant acceleration. However, when I do simulation using the created cam, follower does not shows constant acceleration but fluctuating in the plot of "Linear acceleration". Is there sth wrong in the setting of creating cam?

I have attached screen captures of all plots: linear displacement, velocity and acceleration. See in acceleration plot, obviously there is no "constant acceleration" right?

How can I fix it..
I just want my cam can keep follower in constant deceleration after a rise, then return. It took me whole day/.\ I had try finding solutions in internet and solidwork help but still cannot fix it..

SolidworksSimulation