How do i double the clock frequency input of a digital circuit?

Answer 1

Well..... You could play silly games with delay lines and exclusive OR circuits, or you could try to get a digital phase-locked loop up and running. But it's a whole bunch easier and cheaper to just start with a clock oscillator that runs at twice your current operating frequency.

HTH ☺

Doug

Answer 2

1. phase locked loop tuned to 2x the incoming frequency (clock).

2. two one-shots. Each one triggered on alternate edges of the clock, with pulse widths shorter than 1/2 the clock period. Then OR the two outputs (of the one-shots) together.