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12 March 2024 Femtosecond-precision electronic clock distribution in CMOS chips with laser pulses
Minji Hyun, Hayun Chung, Woongdae Na, Jungwon Kim
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Proceedings Volume PC12892, Optical Interconnects XXIV; PC1289202 (2024) https://doi.org/10.1117/12.3002067
Event: SPIE OPTO, 2024, San Francisco, California, United States
Abstract
We demonstrated a femtosecond-precision clock distribution network (CDN) by injecting photocurrent pulses extracted from an optical frequency comb source into a driverless CDN in CMOS chips. Low-jitter and sharp-edged photocurrent pulses directly drive capacitive metal-mesh structure in a CMOS chip thus generating GHz-clock signal in the voltage domain. Femtosecond-level on-chip jitter and skew have been accomplished in conjunction with ultralow comb-jitter and clock-driverless structure. The inter-domain skew has been compensated in the optical paths by monitoring them with on-chip time-to-digital converter (TDC). When compared to conventional H-tree CDN, reduction of on-chip heat dissipation was observed.
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Minji Hyun, Hayun Chung, Woongdae Na, and Jungwon Kim "Femtosecond-precision electronic clock distribution in CMOS chips with laser pulses", Proc. SPIE PC12892, Optical Interconnects XXIV, PC1289202 (12 March 2024); https://doi.org/10.1117/12.3002067
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KEYWORDS
Clocks
Pulse signals
Femtosecond pulse shaping
Ultrafast phenomena
Photocurrent
Beam divergence
Frequency combs
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