Patent ID: 7315219
Filing Date: 2008-01-01
Classification: H03K,H03L

Abstract:
1. A multiphase voltage controlled oscillator for providing a plurality of signals having the same frequency but different phases according to a control voltage, the multiphase voltage controlled oscillator comprising: a plurality of ring oscillating units, each having a plurality of phase-delay elements and a plurality of first connecting nodes wherein the phase-delay elements in each of said ring oscillating units are electrically series-connected to one another though the first connecting nodes; and a single resistor ring having a plurality of resistor elements and a plurality of second connecting nodes wherein the resistor elements are electrically series-connected to one another through the second connecting nodes; wherein the second connecting nodes are respectively and electrically connected to the first connecting nodes of said ring oscillating units such that the first connecting nodes of said ring oscillating units provide the plurality of signals having the same frequency but different phases.