Voltage-comparing device with analog-signal converter

An analog-signal converter comprising:

• a reference-voltage detecting circuit for outputting a reference-voltage signal in response to an input signal;
• and
• a first comparing device for comparing said input signal and said reference-voltage signal to obtain an output digital signal, wherein said reference-voltage detecting circuit comprises:
• a second comparing device for comparing input signal and a potential-calibrating signal to obtain an index signal;
• a voltage-follower control device electrically connected with said second comparing device for outputting a potential-control signal and a counting signal in response to said index signal and a pulse signal;
• a voltage-follower device electrically connected between said second comparing device and said voltage-follower control device for outputting said potential-calibrating signal in response to said potential-control signal;
• a detecting device electrically connected with said voltage-follower device and said voltage-follower control device for detecting said counting signal, said potential-calibrating signal and said pulse signal to obtain an extreme signal;
• an operational device electrically connected with said detecting device for operating said extreme signal to output an average signal;
• a signal converter electrically connected with said operational device for executing a signal-converting procedure by inputting said average signal to output a dynamic reference-voltage signal;
• and
• a pulse generator electrically connected with said voltage-follower device and said detecting device for producing said pulse signal to obtain said dynamic reference-voltage signal.