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US 12,009,826 B1Granted
Phase noise suppression for reference oscillator
AssigneeAnritsu Corporation
InventorsNikolay Shtin, Oleksandr Chenakin, Suresh P. Ojha
Life of this patent
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Abstract
Circuits, methods, and apparatus that can reduce or suppress phase noise in a frequency synthesizer. A phase-noise-suppression system can detect phase noise in an input signal, amplify the detected phase noise, subtract the detected phase noise from the input signal, and provide an output signal having reduced phase noise.
Claims20
A phase-noise-suppression system comprising:
- an input path comprising a first voltage-controlled phase shifter in series with a frequency multiplier, the input path having an input configured to couple to a signal source external to the phase-noise suppression system;
- a frequency discriminator having an input coupled to an output of the input path;
- a first amplifier path having an input coupled to an output of the frequency discriminator and an output coupled to a control input of the first voltage-controlled phase shifter;
- and
- a second amplifier path having an input coupled to the output of the frequency discriminator and an output coupled to a control input of the frequency discriminator.
2 more elements
A phase-noise-suppression system comprising:
- an input path comprising a voltage-controlled phase shifter in series with a frequency multiplier, the input path having an input configured to couple to a signal source external to the phase-noise suppression system;
- a phase detector having an input coupled to an output of the input path;
- a dielectric resonator circuit having an input coupled to the output of the input path and an output coupled to the phase detector;
- a first amplifier path having an input coupled to an output of phase detector and an output coupled to a control input of the voltage-controlled phase shifter;
- and
- a second amplifier path having an input coupled to the output of the phase detector and an output coupled to a control input of the dielectric resonator circuit.
3 more elements
A dielectric resonator circuit comprising:
- a base forming a cavity;
- a cavity lid over the cavity;
- a dielectric puck attached to the cavity lid;
- a printed circuit board over the cavity lid, the printed circuit board including a first slit formed in a ground plane and a second slit formed in the ground plane;
- a cover over the printed circuit board;
- a first micro strip line over the first slit;
- a second microstrip line over the second slit;
- a first varactor diode attached to the first micro strip line;
- a second varactor diode attached near a first end of the second microstrip line;
- and
- a third varactor diode attached near a second end of the second micro strip line.
8 more elements
Dependencies are inferred from the claim text.