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An Automatic Clock-Induced-Spurs Detector Based on Energy Detection for Direct Digital Frequency Synthesizer
A clock-induced-spurs detector, composed of a programmable low-pass filter (LPF), energy detector and spur detection algorithm, is presented and applied to a four-channel 1 gigabit-samples-per-second (GSPS) direct digital frequency synthesizer (DDS). The proposed detector realizes the detection of s...
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Published in: | Sensors (Basel, Switzerland) Switzerland), 2022-04, Vol.22 (9), p.3396 |
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description | A clock-induced-spurs detector, composed of a programmable low-pass filter (LPF), energy detector and spur detection algorithm, is presented and applied to a four-channel 1 gigabit-samples-per-second (GSPS) direct digital frequency synthesizer (DDS). The proposed detector realizes the detection of spurs based on energy-detection, and the spur detection algorithm is adopted to automatically extract the amplitude and phase of clock-induced spurs, generated by the intermodulation of harmonic spurs and multiple clocks. Finally, the extracted features are sent to auxiliary DDS to decrease the target spur, following which the detector can be turned off to save power. Additionally, the detected characteristics under different output conditions can be read out through the interface for rapid frequency switching. The proposed detector integrated into a DDS is fabricated with a 65 nm complementary metal oxide semiconductor (CMOS) process and has an area of 190 μm × 320 μm. The measured power consumption is roughly 38 mW, consuming 6% that of a single-channel DDS. The test results show that the spurious-free dynamic range (SFDR) of this DDS can be successfully enhanced from -43.1 dBc to roughly -59.9 dBc without any off-chip instruments. This effectively proves that the detection accuracy of this detector can reach around -81 dBm. |
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This effectively proves that the detection accuracy of this detector can reach around -81 dBm.</description><identifier>ISSN: 1424-8220</identifier><identifier>EISSN: 1424-8220</identifier><identifier>DOI: 10.3390/s22093396</identifier><identifier>PMID: 35591086</identifier><language>eng</language><publisher>Switzerland: MDPI AG</publisher><subject>Algorithms ; Clocks ; CMOS ; Complementary metal oxide semiconductors ; Detectors ; direct digital frequency synthesizer ; Energy ; Expected values ; Frequency synthesizers ; Intermodulation ; Low pass filters ; programmable low-pass filter ; Semiconductors ; Sensors ; spur detector ; spur-detection algorithm</subject><ispartof>Sensors (Basel, Switzerland), 2022-04, Vol.22 (9), p.3396</ispartof><rights>COPYRIGHT 2022 MDPI AG</rights><rights>2022 by the authors. Licensee MDPI, Basel, Switzerland. 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This effectively proves that the detection accuracy of this detector can reach around -81 dBm.</abstract><cop>Switzerland</cop><pub>MDPI AG</pub><pmid>35591086</pmid><doi>10.3390/s22093396</doi><orcidid>https://orcid.org/0000-0003-0474-1714</orcidid><orcidid>https://orcid.org/0000-0001-5422-653X</orcidid><oa>free_for_read</oa></addata></record> |
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subjects | Algorithms Clocks CMOS Complementary metal oxide semiconductors Detectors direct digital frequency synthesizer Energy Expected values Frequency synthesizers Intermodulation Low pass filters programmable low-pass filter Semiconductors Sensors spur detector spur-detection algorithm |
title | An Automatic Clock-Induced-Spurs Detector Based on Energy Detection for Direct Digital Frequency Synthesizer |
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