Patent Number: 7,710,208

Title: Multi-speed ring oscillator

Abstract: A ring oscillator comprises a control circuit for receiving a frequency-selection signal operative to select from at least two ring oscillator frequencies, said control circuit using said control signal to generate a first control signal and a second control signal; a primary chain of an odd number of serially connected NOT gates, said primary chain including a primary switching NOT gate responsive to the first control signal and operative to perform a logical NOT or an IGNORE function on a first oscillating input signal to generate a first output signal; and a secondary chain of serially connected NOT gates, said secondary chain logically parallel to at least said primary switching NOT gate, said secondary chain including a secondary switching NOT gate responsive to the second control signal and operative to perform a logical NOT or an IGNORE function on a second oscillating input signal to generate a second output signal.

Inventors: Goff; Lonnie C. (Tempe, AZ)

Assignee: VNS Portfolio LLC

International Classification: H03K 3/03 (20060101)

Expiration Date: 5/04/12018