Logic based ring oscillator coupling circuit
AssigneeRegents of the University of Minnesota
InventorsHyung-il Kim, William Moy
Life of this patent
Estimating the term…
Abstract
A coupled ring oscillator circuit includes a first ring oscillator, a second ring oscillator and a coupling circuit. The first ring oscillator includes a series of delay stages, each delay stage including an inverter gate. The second ring oscillator includes a series of delay stages, each delay stage including an inverter gate. The coupling circuit includes a coupling cell having a first modified tri-state inverter connected in parallel with one of the inverter gates of the first ring oscillator, and a second modified tri-state inverter connected in parallel with one of the inverter gates of the second ring oscillator.
Claims8
A coupled ring oscillator circuit comprising:
- a first ring oscillator comprising a series of delay stages, each delay stage including an inverter gate;
- a second ring oscillator comprising a series of delay stages, each delay stage including an inverter gate;
- and
- a coupling circuit including a coupling cell comprising:
- a first modified tri-state inverter connected in parallel with one of the inverter gates of the first ring oscillator;
- and
- a second modified tri-state inverter connected in parallel with one of the inverter gates of the second ring oscillator.
A coupled ring oscillator circuit comprising:
- a first ring oscillator comprising a series of first delay stages, each first delay stage including an inverter gate;
- a second ring oscillator comprising a series of second delay stages, each second delay stage including an inverter gate;
- and
- a coupling circuit comprising a coupling cell for each pair of the first and second delay stages, each coupling cell comprising:
- a first modified tri-state inverter connected in parallel with the inverter gate of the first delay stage;
- and
- a second modified tri-state inverter connected in parallel with the inverter gate of the second delay stage.
Dependencies are inferred from the claim text.