An integrated circuit includes a first portion of a stacked ring oscillator coupled between a first supply voltage node and a common node, wherein the first supply voltage node provides a local supply voltage for the first portion and the common node provides a local ground for the first portion. The integrated circuit includes a second portion of the stacked ring oscillator coupled between the common node and a second supply voltage node wherein the common node provides a local supply voltage for the second portion and the second supply voltage node provides a local ground for the second portion. The integrated circuit also includes a voltage divider having a first resistive element coupled between the first supply node and the common node and a second resistive element coupled between the common node and the second supply node.