Patent ID: 7109804

Claim:
A relaxation oscillator for generating an oscillator output signal having a predetermined frequency, the relaxation oscillator comprising: a first resistance having a first resistance input adapted to receive a first voltage level and a first resistance output for producing a second voltage level; a voltage to current convertor having a voltage to current convertor input connected to the first resistance output, the voltage to current convertor adapted to generate a first current in proportion to the second voltage level, and output the first current to a current summing node; a charge pump having an input connected to the first voltage level received at the first resistance and an output connected to the current summing node, the charge pump adapted to provide a restoring charge to the current summing node in response to at least one charge pump control signal, the charge pump comprising an interleaved charge pump having a first charge pump capacitor, and a second charge pump capacitor, each of the first charge pump capacitor and the second charge pump capacitor adapted to be selectively charged by the first voltage level and discharged into the current summing node in response to the at least one charge pump control signal; an integrator having an integrator input connected to the current summing node, the integrator adapted to produce an integrator output signal having the predetermined frequency at an integrator output, wherein the predetermined frequency is determined from at least one capacitance value associated with the charge pump and a resistance value associated with the first resistance; and a comparator having a comparator input connected to the integrator output, the comparator adapted to generate the oscillator output signal having the predetermined frequency at a comparator output in response to the integrator output signal.