Amplitude Noise Cancellation of Microwave Tones
Joe Depellette, Ewa Rej, Matthew Herbst, Richa Cutting, Yulong Liu, Mika A. Sillanp\"a\"a

TL;DR
This paper introduces a feedback cancellation technique using FPGA to significantly reduce amplitude noise in microwave tones, improving sensitivity and reducing heating in quantum and sensing systems.
Contribution
The paper presents a novel FPGA-based feedback method for amplitude noise cancellation in microwave generators, effective where phase noise cancellation fails.
Findings
Achieved 13 dB noise power reduction at 2 MHz offset
Reduced cavity heating rate by a factor of 3.5
Lowered minimum oscillator occupation by a factor of 2
Abstract
Carrier noise in coherent tones limits sensitivity and causes heating in many experimental systems, such as force sensors, time-keeping, and studies of macroscopic quantum phenomena. Much progress has been made to reduce carrier noise using phase noise cancellation techniques, however, in systems where amplitude noise dominates, these methods are ineffective. Here, we present a technique to reduce amplitude noise from microwave generators using feedback cancellation. The method uses a field-programmable gate array (FPGA) to reproduce noise with a tunable gain and time delay, resulting in destructive interference when combined with the original tone. The FPGA additionally allows for tuning of the frequency offset and bandwidth in which the noise is canceled. By employing the cancellation we observe 13 dB of noise power reduction at a 2 MHz offset from a 4 GHz microwave tone, lowering the…
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Taxonomy
TopicsRadio Wave Propagation Studies · Microwave Engineering and Waveguides · Antenna Design and Optimization
