Difference Between Analog and Digital PID?

[kashif22041]

hey

I want to know whats the basic difference betwenn analog and digital PID?
I want to control a servo motor for velocity and positioning, which would be better?

Thanks in advance.

 

[kender]

Digital system is more flexible, because it's easier to adjust its parameters. Here's a rule of thumb. If the rate of your digital control loop is 20-30 times the bandwidth of your plant (or greater), then you can apply the same analysis to the digital system as if it were analog.

 

[kashif22041]

Thanks

but can u tell me which is easier to design? which is more used in industry and which would be better for my project?