OSCILLATOR CAPABLE OF VARYING FREQUENCY OF OUTPUT SIGNAL INVERSELY PROPORTIONAL TO POWER SOURCE VOLTAGE, ESPECIALLY INCLUDING CLOCK SWITCHING UNIT GENERATING THE FREQUENCY INVERSELY PROPORTIONAL TO THE POWER SOURCE VOLTAGE

摘要

PURPOSE: An oscillator capable of varying the frequency of output signal inversely proportional to the power source voltage is provided to reduce the current consumption of the overall system by inversely varying the frequency of the output signal to the power source voltage. CONSTITUTION: An oscillator capable of varying the frequency of output signal inversely proportional to the power source voltage includes a comparison voltage generation unit(112), a comparison unit(120) and a clock switching unit(130). The comparison voltage generation unit is driven by a predetermined power source voltage and generates the comparison voltages varied in response to the predetermined clock signals and the first reference voltage. The comparison unit compares the comparison voltages with the second reference voltage and outputs the logic signal having a predetermined logic level. And, the clock switching unit outputs the clock signals having the frequency inversely proportional to the power source voltage in response to the logic signal.