If it had an infinite ratio it would just clip the signal anyway. They're typically around 20:1 ratio (ie the input signal has to be over 3 times louder then the allowed peak signal to still clip it). Anything more then that has too much distortion, anything less may as well be a regular compressor.
Key point though, limiter should ALWAYS be the last thing in your master effects. Nothing wrong with a compressor before it.