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An Eight-Channel Switching-Linear Hybrid Dynamic Regulator with Dual-Supply LDOs for Thermo-Optic Tuning
  • Siyuan Zhang ,
  • Xingze Wang ,
  • min tan
Siyuan Zhang
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Xingze Wang
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min tan
Huazhong University of Science and Technology

Corresponding Author:[email protected]

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Abstract

A novel switching-linear hybrid dynamic regulator architecture with dual-supply low dropout regulators (LDOs) is presented in this paper. This architecture leverages the intrinsic dual supplies to extend the operating range of the LDOs. Furthermore, it increases the thermo-optic tuning efficiency by reducing the LDO dropout voltage through dynamic supply modulation. This architecture is suitable for large-scale thermooptic tuning in silicon photonics. The efficiency improvement is particularly effective when tracking signals of several adjacent channels are close to each other, e.g., wavelength tuning of a microring array. The principle of this architecture is general and can be implemented using different switching converters and LDOs. A specific design with extensive post-layout simulation results is used to verify the effectiveness of our architecture. Implemented in a 130 nm CMOS process, this design can simultaneously regulate eight output channels with an output swing of 0.8 Vpp. Its peak efficiency when driving 100 ohms loads is 92% at 1 V output, and the dynamic efficiency is around 86% when tracking 50 kHz sinusoidal signals. To the best of our knowledge, this is the first time that dynamic supply modulation has been applied to the thermo-optic tuning of silicon photonic devices.
Aug 2022Published in IEEE Transactions on Circuits and Systems I: Regular Papers volume 69 issue 8 on pages 3428-3437. 10.1109/TCSI.2022.3169879