Patent Number: 6,670,858

Title: High speed voltage-controlled ring oscillator

Abstract: A high speed ring voltage-controlled oscillator (VCO) system is provided. The ring VCO system includes a plurality of interpolation stages coupled in a "look-ahead" configuration. Each interpolation stage receives two signal inputs and outputs a single differential voltage representative of a time delay interpolation between the two input signals. In accordance with the invention, each interpolation stage receives a first signal input from the immediately previous stage and a second signal input from the output of a different stage. In this manner, the delay stages in the ring VCO can generate a variable delay by interpolating between inputs with small relative delays without adding additional delay to the total loop delay.

Inventors: Tang; Benjamim (Hawthorne, CA)

Assignee: Primarion, Inc.

International Classification: H03K 3/0231 (20060101); H03L 7/099 (20060101); H03L 7/08 (20060101); H03L 7/10 (20060101); H03K 3/03 (20060101); H03K 3/00 (20060101); H03L 7/16 (20060101); H03L 7/189 (20060101); H03B 027/00 ()

Expiration Date: 12/30/2020