Journal
APPLIED PHYSICS LETTERS
Volume 110, Issue 6, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4975798
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Funding
- Div Of Civil, Mechanical, & Manufact Inn
- Directorate For Engineering [1234067] Funding Source: National Science Foundation
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In this work, we introduce and experimentally demonstrate a parametric phase noise suppression technique, which we call parametric phase noise filtering. This technique is based on the use of a solid-state parametric amplifier operating in its instability region and included in a non-autonomous feedback loop connected at the output of a noisy oscillator. We demonstrate that such a system behaves as a parametrically driven Duffing resonator and can operate at special points where it becomes largely immune to the phase fluctuations that affect the oscillator output signal. A prototype of a parametric phase noise filter (PFIL) was designed and fabricated to operate in the very-high-frequency range. The PFIL prototype allowed us to significantly reduce the phase noise at the output of a commercial signal generator operating around 220 MHz. Noise reduction of 16 dB (40 x) and 13 dB (20 x) were obtained, respectively, at 1 and 10 kHz offsets from the carrier frequency. The demonstration of this phase noise suppression technique opens up scenarios in the development of passive and low-cost phase noise cancellation circuits for any application demanding high quality frequency generation. Published by AIP Publishing.
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