Patent ID: 8106715

Claim:
A system comprising: a first oscillator having an output and comprising a first comparator having a first reference input, wherein the first oscillator is configured to generate a first low-threshold value and a first high-threshold value at the first reference input, to achieve an oscillation period of the first oscillator; and a second oscillator having an output and comprising a second comparator having a second reference input, wherein the second oscillator is configured to generate a second low-threshold value and a second high-threshold value at the second reference input, to achieve an oscillation period of the second oscillator; wherein in achieving the oscillation period of the first oscillator through the first low-threshold value and the first high-threshold value, and in achieving the oscillation period of the second oscillator through the second low-threshold value and the second high-threshold value, a difference between the oscillation period of the first oscillator and the oscillation period of the second oscillator remains substantially independent of variations in temperature; and wherein the first low-threshold value is higher than the second low-threshold value, and the first high-threshold value is lower than the second high-threshold value.