Patent ID: 8085102

Claim:
A low-power relaxation oscillator comprising: (a) a first module having a ramp generator formed by a reference current source and a storage capacitor supplied by the reference current source via a reference current branch and defining a ramp voltage, and a voltage comparator for comparing the ramp voltage with a reference voltage, (b) a second module having a ramp generator formed by a reference current source and a storage capacitor supplied by the reference current source via a reference current branch and defining a ramp voltage, and a voltage comparator for comparing the ramp voltage with a reference voltage, and (c) an asynchronous flip-flop receiving the output signal of the comparator of the first module at a first input and the output signal of the comparator of the second module at a second input and alternately outputting control signals for charging the capacitor of the first module and the capacitor of the second module, wherein for each module a generator of said reference voltage is configured by adding a reference resistance arranged on said reference current branch in such a manner that the reference voltage is defined by the reference current flowing through this reference resistance.