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US 2013/0154750 A1Published application
Oscillator regeneration device
AssigneeAnalog Devices, Inc.
InventorAndrey Martchovsky
Life of this patent
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Abstract
A negative resistance device for a multiphase oscillator is disclosed. The negative resistance device is coupled to taps of the multiphase oscillator so that it injects no energy into the oscillator when the oscillator is most sensitive to noise, thereby decreasing the phase noise of the oscillator. The negative resistance device also guarantees the direction of movement of a traveling wave past the taps of the multiphase oscillator.
Claims8
A multiphase oscillator comprising:
- one or an odd number of means for reversing a polarity of a wave traveling thereon;
- a pair of conductors arranged to form a closed loop when coupled with the polarity reversing means such that the wave traveling between the conductors imparts a first polarity between the conductors after a first traversal of the closed loop and a second polarity after a second traversal of the loop;
- and
- a plurality of regeneration devices, each said regeneration device connected between the pair of conductors of the closed loop at a particular position on the loop and having an output that matches the polarity between the conductors at the position of the regeneration device after a traveling wave has passed the position, each said regeneration device having an output that transitions as the traveling wave is passing the position of the device, said transition including a dwell time during which the device output neither sources nor sinks current.
1 more element
A method for reducing phase noise in a multiphase oscillator, the method comprising:
- providing a plurality of negative resistance devices, each supplying energy to the oscillator to maintain oscillations of the oscillator;
- and
- switching the output of each negative resistance device in synchronism with the oscillations of the oscillator, such that, during the switching, the output has a time in which the negative resistance device neither sources current into nor sinks current from the oscillator, wherein the phase noise of the multiphase oscillator is reduced.
Dependencies are inferred from the claim text.