Patent ID: 8072275

Claim:
A variable frequency digital ring oscillator comprising: a first oscillator portion including a plurality of electronic cells, wherein one or more electronic cells is configured to be selectively enabled, wherein the first oscillator portion is configured to output a toggled signal having a first frequency, and wherein the first frequency is based at least in part on a number of the plurality of electronic cells that are enabled; a controller configured to selectively enable one or more of the plurality of electronic cells to cause the first oscillator portion to output the toggled signal at substantially a desired frequency; and a second oscillator portion that is coupled to the first oscillator portion, wherein the second oscillator portion is configured to receive the toggled signal and to output a second toggled signal, wherein the first oscillator portion is configured to receive the second toggled signal, and wherein the first frequency is based at least in part on a frequency of the second toggled signal.