Multiphase voltage controlled oscillator
AssigneeRealtek Semiconductor Corp.
InventorMing Chiang
Life of this patent
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Abstract
A multiphase voltage controlled oscillator includes at least one ring oscillating unit and a resistor ring; the ring oscillating unit is formed by connecting a plurality of phase-delay elements in cascade and the resistor ring is formed by connecting a plurality of resistor elements in cascade; wherein the connecting nodes of each ring oscillating unit are electrically connected to the connecting nodes of the resistor ring such that the ring oscillating unit can generate a plurality of oscillating signals with uniform phase differences.
Claims13
A multiphase voltage controlled oscillator, which can provide a plurality of signals having the same frequency but different phases according to a control voltage, the multiphase voltage controlled oscillator comprising:
- at least one ring oscillating unit having a plurality of phase-delay elements and a plurality of first connecting nodes wherein the phase-delay elements are electrically series-connected to one another through the first connecting nodes;
- and
- a 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 such that the first connecting nodes provide the plurality of signals having the same frequency but different phases.
A multiphase voltage controlled oscillator, which can provide 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 of the ring oscillating units having a plurality of phase-delay elements which are electrically series-connected to one another and output the plurality of signals;
- and
- a phase clamping unit having a plurality of connecting nodes wherein the connecting nodes are respectively coupled to the phase-delay elements thereby clamping the phases of the signals outputted from the phase-delay elements.
Dependencies are inferred from the claim text.