Using Analog Complex Mixers for Low-IF Mixing
Assim, Ara Abdulsatar; Pärssinen, Aarno; Rahkonen, Timo (2024-08-21)
IEEE
21.08.2024
A. A. Assim, A. Pärssinen and T. Rahkonen, "Using Analog Complex Mixers for Low-IF Mixing," 2023 International Symposium on Fundamentals of Electrical Engineering (ISFEE), Bucharest, Romania, 2023, pp. 1-6, doi: 10.1109/ISFEE60884.2023.10637096.
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© 2023 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
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Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi:oulu-202408235560
https://urn.fi/URN:NBN:fi:oulu-202408235560
Tiivistelmä
Abstract
IQ mixers and complex mixers are both used to cancel the image band signal. In this paper, we analyse a complex IF sub-THz receiver architecture aimed for splitting a multi-GHz baseband signal into narrower sub-bands for easier A/D conversion. The architecture consists of a normal IQ direct downconversion, followed by complex mixers to center the chosen sub-carriers to DC. Image rejection versus mismatch errors is calculated both analytically and on system and circuit-level simulations. It was seen that the image rejection is dominated by the IQ downconversion stage. It is demonstrated that the mismatches in the IQ stage can be corrected digitally by weighted summing of the digital sub-bands.
IQ mixers and complex mixers are both used to cancel the image band signal. In this paper, we analyse a complex IF sub-THz receiver architecture aimed for splitting a multi-GHz baseband signal into narrower sub-bands for easier A/D conversion. The architecture consists of a normal IQ direct downconversion, followed by complex mixers to center the chosen sub-carriers to DC. Image rejection versus mismatch errors is calculated both analytically and on system and circuit-level simulations. It was seen that the image rejection is dominated by the IQ downconversion stage. It is demonstrated that the mismatches in the IQ stage can be corrected digitally by weighted summing of the digital sub-bands.
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