A Fully-Generic-Process Galvanic Isolator for Gate Driver with 123mW 23% Power Transfer and Full-Triplex 21/14/0.5Mb/s Bidirectional Communication Utilizing Reference-Free Dual-Modulation FSK DATA2 is transferred in the same manner as DATA1 through another transformer. Almost all the circuits excluding the DATA1 driver and I/O buffer operate at 1.5V supply to support sufficiently high operating speed. The driver operates with 5.5V supply to transfer power by the same transformer, and the rectifier placed in parallel with the DATA1 receiver extracts the received power.

📋 论文概要

该论文提出了一种全通用工艺的电流隔离器，用于栅极驱动器，实现了123mW功耗和23%的功率传输效率，并支持全三工通信，速率分别为21/14/0.5Mb/s。通过VCO同步和双延迟线解调技术，解决了变压器有限带宽导致的时序不确定性，避免了数据错误。

💡 主要创新点

• 采用VCO同步和基于延迟的数字频率计数解调方法，提高了数据接收的可靠性。
• 使用双11级DFF延迟线，将随机时序不确定性减半，消除了最坏情况下的时序裕度问题。

🏷 关键词

📄 原文摘要

Thanks to the VCO synchronization, demodulation can be realized by a delaybased digital frequency counting normalized by the oscillation period (tVCO). But there is a challenge in that the received signal edge is not perfectly aligned with the VCO output at the data transition due to the finite bandwidth of the transformers. Maximum 1tVCO of random timing uncertainty is introduced at the input FF of the delay line. It completely consumes the timing margin in the worst case and causes data error. To deal with this, the demodulator employs dual 11stage DFF delay lines and halves the uncertainty to guarantee at least 0.5tVCO margin. By applying the original and the inverted VCO output to the two delay paths, one of them has 10 to 10.5tVCO delay range and the delay range of the other one is from 10.5 to 11 tVCO. Which one is which is arbitrary, however, taking AND of these outputs, the later rising edge of the two paths is always selected. By

👥 作者与机构

Hiroaki Ishihara, Kohei Onizuka, Figure 18.8.3 explains the operation of the error-tolerant DATA1 demodulator.