Record link: 
http://hdl.handle.net/20.500.12708/220746
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Title: 
A CMOS Source-Coupled Relaxation Oscillator Achieving Close-in Phase Noise of -72.9 dBc/Hz at a 1 kHz Offset
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Citation: 
Mesgari, B., Saeedi, S., Feger, R., & Zimmermann, H. (2025). A CMOS Source-Coupled Relaxation Oscillator Achieving Close-in Phase Noise of -72.9 dBc/Hz at a 1 kHz Offset. In 2025 Austrochip Workshop on Microelectronics (Austrochip) (pp. 17–20). IEEE. https://doi.org/10.1109/Austrochip67945.2025.11183682
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Publisher DOI: 
10.1109/Austrochip67945.2025.11183682
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Publication Type: 
Inproceedings - Full-Paper Contribution
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Language: 
English
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Authors: 
Mesgari, Baset 
Saeedi, Saeed 
Feger, Reinhard 
Zimmermann, Horst 
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Organisational Unit: 
E354-02 - Forschungsbereich Integrated Circuits 
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Published in: 
2025 Austrochip Workshop on Microelectronics (Austrochip) 
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ISBN: 
979-8-3315-5477-4
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Date (published): 
2025
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Event name: 
2025 Austrochip Workshop on Microelectronics (Austrochip) 
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Event date: 
24-Sep-2025 - 25-Sep-2025
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Event place: 
Linz, Austria
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Number of Pages: 
4
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Publisher: 
IEEE
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Peer reviewed: 
Yes
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Keywords: 
Phase noise; Timing jitter; Sensitivity; Power demand; CMOS process; Performance metrics; Topology; 1/f noise; Transistors; Clocks; Relaxation Oscillator; Flicker Noise Upconversion; Close-In Phase Noise; impulse sensitivity function (ISF); Low power consumption
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Abstract: 
A modified source-coupled relaxation oscillator with dynamic biasing feedback is presented as a reference clock. The proposed topology achieves a close-in phase noise of -72.9 dBc/Hz at a 1 kHz offset. By suppressing the effective impulse sensitivity function of the tail transistors, the technique significantly reduces flicker noise upconversion into the oscillator’s 1/f3 phase noise. Experimental results demonstrate a close-in figure of merit improvement of approximately 4 dB over previously reported comparator-based RC relaxation and source-coupled relaxation oscillator designs. Implemented in a 0.35 µm CMOS process, the oscillator operates at 2.65 MHz while consuming only 13.2 µW from a 3 V supply.
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Research Areas: 
Nanoelectronics: 100%
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Science Branch: 
2020 - Elektrotechnik, Elektronik, Informationstechnik: 100%
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Appears in Collections:
Conference Paper

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