Patent ID: 7848719
Filing Date: 2010-12-07
Classification: H01Q,H03L

Abstract:
1. An ultra-wideband variable-phase ring-oscillator circuit comprising: a plurality of tuned amplifiers configured in series as a ring, wherein the ring includes a plurality of output nodes for connection to a plurality of antennas; a first phase-locked loop connected to the ring, wherein the first-phased locked loop includes a first phase shifter coupled to the ring, wherein the first phase shifter provides a phase delay between each pair of successive tuned amplifiers; and a reference oscillator configured and arranged to produce an output and connected to the first phase-locked loop by a reference path, wherein the reference oscillator is locked to a reference frequency source by a second phase-locked loop having a plurality of static frequency dividers producing a division factor; and a plurality of squarers, each connected to a respective output node, and configured and arranged to double the operational frequency of a signal provided by the ring.