FREQUENCY-VOLTAGE CONVERSION CIRCUIT, DELAY AMOUNT JUDGEMENT CIRCUIT, SYSTEM HAVING FREQUENCY-VOLTAGE CONVERSION CIRCUIT, METHOD OF ADJUSTING INPUT/OUTPUT CHARACTERICTICS OF FREQUENCY-VOLTAGE CONVERSION CIRCUIT, AND APPARATUS FOR AUTOMATICALLY ADJUSTING INPUT/OUTPUT CHARACTERISTICS OF FREQUENCY-VOLTAGE CONVERSION CIRCUIT

摘要

PURPOSE: An apparatus is provided for automatically adjusting input/output characteristics of frequency-voltage conversion circuit and frequency-voltage conversion circuit delay amount judgement circuit system. CONSTITUTION: A frequency-voltage conversion circuit (21) is adapted to receive clock (CLK) as an input, and provide as an output a voltage (IVdd) corresponding to the frequency of the clock (CLK). The input/output characteristics of the frequency-voltage conversion circuit (21) are so adjusted that they substantially agree with given input/output characteristics