Qualcomm QTM545: A Technical Deep Dive into 5G mmWave, Antenna-in-Package Design, and PCB Ground-Plane Reflection
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Introduction Recently, I have been investigating 5G millimeter-wave (mmWave) modules and came across a component marked QTM555. It belongs to Qualcomm’s QTM family, but publicly available documentation on this particular part appears to be scarce.…
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DIY USB-C Isolated USB-to-UART Adapter: CH9102X, Dual Voltage Support, and Full Signal Isolation
Introduction: Why I Designed My Own Isolated USB-to-UART Adapter A USB-to-UART adapter is one of the most frequently used tools on an electronics engineer’s workbench. Whether I am debugging an MCU, capturing boot logs, flashing firmware, or…
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