A Single-Ended High-Voltage-Compliant 11-bit Current-Steering Digital-to-Analog Converter for Adaptive Noise Cancellation in Power Over Data Line Networks
A Single-Ended High-Voltage-Compliant 11-bit Current-Steering Digital-to-Analog Converter for Adaptive Noise Cancellation in Power Over Data Line Networks
Abstract:
Automotive Ethernet is considered to be the backbone of future in-vehicle data communication. One main feature is its ability to simultaneously transmit data and energy via power over data lines (PoDL). This article proposes the design of a single-ended high-voltage (HV)-compliant 11-bit current-steering digital-to-analog converter (DAC). The converter is tailored for the utilization as digitally controlled current source in adaptive noise-cancellation filter for PoDL networks. Designed in an HV-compliant 180-nm bipolar complementary metal-oxide-semiconductor (BiCMOS) semiconductor technology, the DAC features a monolithically combined topology of two identical 10-bit low-voltage (LV) current-steering DACs supplied at 1.8 V and two complementary HV-compliant output current stages. Main design features of the segmented LV DAC are the utilization of single-ended current cells with an optimized switching logic, proposed to enhance the cells inherent performance and energy efficiency. Furthermore, a newly derived 0.4° asymmetric output walk switching scheme is investigated. At a maximum output voltage swing of 6 V, the proposed DAC provides a bidirectional output current with the amplitude of up to 50 mA. The proposed DAC exhibits the highest voltage compliance combined with large output current capability reported to date for HV-DACs. It also features excellent dynamic performance with a spurious free dynamic range (SFDR) of 57.8 dB as well as measured four sample rates enabling up to 1.6 MS/s and a maximum integral nonlinearity (INL) error of 1.61 LSB and a differential nonlinearity (DNL) error of 1.05 LSB.
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A Single-Ended High-Voltage-Compliant 11-bit Current-Steering Digital-to-Analog Converter for Adaptive Noise Cancellation in Power Over Data Line Networks
