Patent ID: 8384457
Filing Date: 2013-02-26
Classification: H03K

Abstract:
1. Circuitry for controlling the duty cycle of an input signal towards a desired value, the circuitry comprising: a sequence of at least two inverters arranged in series, wherein a first inverter of the sequence of inverters is arranged to receive the input signal and wherein a last inverter of the sequence of inverters is arranged to output an output signal having a same frequency as the input signal, said output signal being an adjusted version of the input signal and wherein the output of the first inverter is coupled via a resistor to the input of the first inverter; and feedback circuitry arranged to receive the output signal, the feedback circuitry comprising: comparing means for comparing the output signal with a reference signal indicative of a desired value and for generating a feedback signal based on the comparison of the output signal and the reference signal, and supplying means for supplying the feedback signal to adjust operating conditions of at least one of the inverters of the sequence of inverters, such that the duty cycle of the output signal is controlled towards said desired value.