Random number generating device

A random number generating device, comprising:

• a first frequency generating circuit, generating a first frequency signal according to a signal inputted via an input end of the first frequency generating circuit and outputting the first frequency signal via an output end of the first frequency generating circuit;
• a second frequency generating circuit, generating and outputting a clock signal;
• and
• a flip-flop, comprising a data input end, a clock input end and a data output end;
• the data input end and the clock input end are electrically connected to the output end of the first frequency generating circuit and the second frequency generating circuit respectively;
• the flip-flop outputs a random signal via the data output end according to the first frequency signal and the clock signal and feedbacks the random signal to the input end of the first frequency generating circuit to change frequency of the first frequency signal;
• wherein frequency of the first frequency signal is higher than frequency of the clock signal.