Patent ID: 6686806
Filing Date: 2004-02-03
Classification: H03K

Abstract:
A controlled oscillator, comprising:at least one ring oscillator comprising: an odd number of inverter stages coupled together in a ring configuration, each inverter stage having an output terminal and at least one input terminal and comprising a pull-up device and a pull-down device; for at most one of the inverter stages: an RC network coupled within a current path of one of the pull-up device and the pull-down device of the one inverter stage and coupled to an output terminal of the one inverter stage; and a control input signal coupled to said one of the pull-up device and the pull-down device of the one inverter stage, an other one of the pull-up device and the pull-down device of the one inverter stage being coupled to an output terminal of a preceding inverter stage in the ring configuration.