Phase noise suppression through parametric filtering

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 fe...

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Bibliographic Details
Published in:Applied physics letters 2017-02, Vol.110 (6)
Main Authors: Cassella, Cristian, Strachan, Scott, Shaw, Steven W., Piazza, Gianluca
Format: Article
Language:English
Subjects:
Applied physics
Cancellation circuits
Carrier frequencies
Feedback loops
Filtration
Noise
Noise levels
Noise reduction
Offsets
Parametric amplifiers
Phase noise
Radio frequency
Signal generators
Stability
Variation
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Summary: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×) and 13 dB (20×) 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.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4975798