High-Speed Floating Voltage Level Shifter With Self-Locked Noise Immunity for High-Side Gate Driver
High-Speed Floating Voltage Level Shifter With Self-Locked Noise Immunity for High-Side Gate Driver
Abstract:
Level shifters (LSs) are essential circuit elements within high-side gate drivers, responsible for translating logic signals from a low-voltage (LV) domain to a high-voltage (HV) domain. However, high-frequency gate drivers impose stringent requirements on the propagation delay and reliability of LSs. This article presents a novel high-speed floating voltage LS that achieves subnanosecond propagation delays and enhanced noise immunity. The proposed structure, termed the common-mode self-locking (CMSL) LS, mitigates both common-mode (CM) and differential-mode (DM) noise. The proposed architecture incorporates two complementary techniques: a cross-coupled current mirror topology to suppress CM transient noise, and a combination of resistive signal sensing and a self-locking (SL) mechanism to provide DM transient noise immunity. The proposed technique achieves subnanosecond propagation delay while ensuring high noise immunity and maintaining excellent tolerance to negative voltage swings on the floating supply rail. The design is implemented in a 0.18-µm bipolar CMOS–DMOS on the silicon-on-insulator (BCD-on-SOI) process. Simulation results demonstrate that the final LS achieves an average prop-agation delay as low as 410 ps. The figure of merit (FOM) is 0.057 ns/(µm·V), indicating superior performance compared to existing solutions. The experimental results validate the LS’s performance, demonstrating an overall propagation delay of less than 19 ns and a dV/dt noise immunity of up to 42.8 V/ns. The design supports a negative VS swing of −4.12 V at a 5-V supply voltage. Furthermore, verification in a 600-V BCD process confirms the architecture’s intrinsic robustness and superior immunity performance suitable for HV applications.
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High-Speed Floating Voltage Level Shifter With Self-Locked Noise Immunity for High-Side Gate Driver
