Patent ID: 9077322
Filing Date: 2015-07-07
Classification: H03K

Abstract:
1. A phase-startable ring oscillator having an output at which is produced an oscillator signal, comprising: a first input receiving a start control signal to control the onset of oscillation from a static state; a second input receiving control data that control the generation of a predetermined signal level at the output during the static state, and select an initial gate delay of the oscillator signal from a predetermined set of selectable initial gate delays; a first plurality of multiplexers; and a second plurality of multiplexers coupled with the first plurality of multiplexers, wherein the second plurality of multiplexers are fractional multiplexers and the gate delay time has a fractional value, and further wherein the fractional multiplexers are configured to receive a signal from a digital-to-analog converter; wherein, in response to the start signal, the oscillator continues to generate the predetermined signal level at the output for the selected gate delay time, and begins oscillation thereafter.