Patent ID: 8289091

Claim:
A relaxation oscillator, comprising: a ramp wave generator configured to generate a ramp wave by a complementary operation between a first capacitor module charged and discharged according to a first switching signal and a second capacitor module charged and discharged according to a second switching signal; a negative feedback circuit unit configured to generate a compensation voltage for compensating an error between the ramp wave and a reference voltage through a feedback of the ramp wave; and a switching signal generator configured to generate the first switching signal and the second switching signal from the compensation voltage and the ramp wave, wherein the switching signal generator includes: a peak voltage storage unit configured to receive the ramp wave from the ramp wave generator and the compensation voltage from the negative feedback circuit and to store a peak voltage of the ramp wave that is controlled to be equal to the reference voltage based on the compensation voltage; and a peak voltage transfer unit configured to transfer the peak voltage of the ramp wave stored in the peak voltage storage unit to the negative feedback unit.