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A Four-Channel Gray-Code Addressing TDM Clocked-Analog LDO for Thermo-Optic Tuning in Silicon Photonics

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posted on 12.10.2021, 02:05 authored by tianchi yetianchi ye, kaixuan ye, Min Tan
This paper presents a Gray-code addressing time division multiplexing (TDM) clocked-analog low-dropout regulator (CLDO) that shares one controller between four output channels with only one compensation capacitor. We apply the Gray-code addressing strategy to reduce the crosstalk. We also apply the split-output amplifier structure to share the compensation capacitor for further chip area reduction. In addition, we introduce a lightweight local-generated supply to increase the dynamic range. Implemented in 130 nm CMOS process, this design has a total chip area of 0.056 mm2 , which is 67.5% smaller than the conventional solution with four identical LDOs. Post layout simulation results show that the presented four-channel TDM CLDO can simultaneously track four 1 Vpp sinusoidal signals at different frequencies with negligible crosstalk. This TDM CLDO is a promising solution for supplying multiple thermo-optic phase shifters (TOPSs) in silicon photonics

Funding

Research on Novel Dual-channel Dynamic Power Chip for Efficient On-Chip Thermal-Light Regulation

National Natural Science Foundation of China

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Major State Basic Research Development Program of China under Grant 2018YFA0704400

Fundamental Research Funds for the Central Universities, HUST under Grant 2019kfyXKJC037

History

Email Address of Submitting Author

tianchiye@hust.edu.cn

Submitting Author's Institution

Huazhong University of Science and Technology

Submitting Author's Country

China