Oscillator circuit with reduced capacity for AC coupling capacitor

Abstract

There is disclosed an oscillator circuit in which the first capacitor is connected between the input side of a CMOS inverter in a quartz oscillator circuit and a higher potential side, the second load capacitor is connected between the input side of the inverter and a lower potential side, the third load capacitor is connected between the output side of the inverter and the higher potential side, and the fourth load capacitor is connected between the output side of the inverter and the lower potential side, so that variation in amplitudes of the voltage sources synchronized with the oscillation can be reduced with the realization of lower current consumption. There is also disclosed an oscillator circuit of reduced circuit scale. A CMOS inverter for producing oscillations an AC coupling capacitor, and a buffer circuit are formed on one chip. A protective circuit that has been heretofore required at the input terminal portion of the buffer circuit can be dispensed with. Therefore, the capacity of the AC coupling capacitor can be reduced. Consequently, the circuit scale can be decreased.

Dependencies are inferred from the claim text.