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# Phase noise suppression in frequency comb generators

## By: Howe, D.A.; Nava, J.F.G.; Hati, A.; Nelson, C.W.;

2010 / IEEE / 978-1-4244-6401-2

### Description

This item was taken from the IEEE Conference ' Phase noise suppression in frequency comb generators ' We propose an idea to suppress the flicker (1/f) noise in radio frequency (RF) multiplier-based frequency comb generators. Comb generators are often used for frequency multiplication in frequency synthesis. In general, comb generators apply high power to a nonlinear element (NLE) such as a step-recovery diode to generate harmonics. Flicker of phase from the NLE causes significant noise to be projected onto the higher-order harmonics of the input signal. The phase noise of the n-th harmonic increases by n^{2} relative to the noise of the input signal; this is also true for the input-referred multiplier phase noise. A system can be constructed that compares the fundamental signal before and after it enters the comb generator. If the phase perturbations between the fundamental and any particular harmonic can be measured in real time, a feedback or feed-forward servo can be implemented to correct the phase noise that is introduced by frequency multiplication. A defective excessively noisy comb generator is used in this experiment to act as the candidate for noise correction. This allows for simplified testing of the proof of principle by measuring the corrected candidate versus a typical comb generator.

**Related Topics**

Nonlinear Element

Step-recovery Diode

Harmonic Generation

N-th Harmonic

Input-referred Multiplier Phase Noise

Fundamental Signal

Phase Perturbations

Feedforward Servo

Feedback Servo

Phase Noise

Frequency Synthesizers

Harmonic Analysis

Noise Measurement

Generators

Frequency Conversion

Step Recovery Diode

Comb Generation

Flicker Noise

Frequency Multiplication

Phase Noise

Noise Suppression

Engineering

Phase Noise

1/f Noise

Flicker Noise

Frequency Multipliers

Frequency Synthesizers

Harmonic Generation

Interference Suppression

Defective Excessively Noisy Comb Generator

Phase Noise Suppression

Frequency Multiplication

Radio Frequency Multiplier-based Frequency Comb Generators

Frequency Synthesis

1/f Noise

Frequency Comb Generators

Flicker Noise Suppression