A Proof of Concept Balanced Mixer with the use of a Digital IF Power Combiner to Improve LO Noise Rejection

In this work we present a novel digital technique, that allows local oscillator (LO) noise cancellation using a digital power combiner in a balanced mixer receiver architecture. A theoretical analysis of the noise cancellation using the proposed technique is derived and a proof of concept experiment...

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Bibliographic Details
Published in:Publications of the Astronomical Society of the Pacific 2023-12, Vol.135 (1054), p.125003
Main Authors: Monasterio, David, Jorquera, Sebastian, Curotto, Franco, Espinoza, Camilo, Finger, Ricardo, Bronfman, Leonardo
Format: Article
Language:English
Subjects:
Astronomical instrumentation
Noise
Theoretical analysis
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Summary:In this work we present a novel digital technique, that allows local oscillator (LO) noise cancellation using a digital power combiner in a balanced mixer receiver architecture. A theoretical analysis of the noise cancellation using the proposed technique is derived and a proof of concept experiment is made for the Ku -Band. This experiment includes the design and construction of a custom balanced mixer and an artificial noise source. Experimental results show a consistent noise temperature reduction in comparison with a full analog mixer, and in some cases reaching noise temperature levels similar to the receiver operating without the artificial LO noise.
ISSN:0004-6280
1538-3873
DOI:10.1088/1538-3873/ad0789