A 25 Mbps 15 ns Propagation Delay 150 kV/μs CMTI Configurable Dual-Channel Capacitive Digital Isolation Driver.

Area of Science:

• Electrical Engineering
• Semiconductor Devices
• Power Electronics

Background:

• Electrical isolation is critical for electronic system reliability, especially in harsh conditions.
• Digital isolators are prevalent in low-power circuits for their disturbance immunity.
• High-efficiency power supplies require robust isolation solutions capable of high data rates and transient immunity.

Purpose of the Study:

• To propose a novel capacitive digital isolator architecture.
• To achieve high common-mode transient immunity (CMTI) and high data transmission rates for power supply applications.
• To enhance the drive capacity and reduce propagation delay in digital isolators.

Main Methods:

• Utilizing on-off keying (OOK) modulation for high-speed, accurate signal transmission.
• Developing a fully integrated high-voltage level-shift driver with nanosecond-scale delay.
• Implementing and simulating the proposed architecture using Cadence IC 6.1.7 with a standard 0.18 μm CMOS process.

Main Results:

• Achieved a data transmission rate of 25 Mbps.
• Demonstrated a typical propagation delay of 15 ns.
• Realized a common-mode transient immunity (CMTI) exceeding 150 kV/μs.
• Obtained output peak currents of 2 A and 4 A.

Conclusions:

• The proposed capacitive digital isolator effectively meets the demands of high-efficiency power supply scenarios.
• The design provides a significant improvement in CMTI and data transmission speed compared to existing solutions.
• This architecture is suitable for applications requiring reliable operation under harsh electrical conditions.