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