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Based on an in-circuit measurement approach, a systematic EMI filter design procedure is developed to suppress the noise from a digital board to the power supply. The two-probe technique adopted for the in-circuit measurement allows the impedances of the power supply and the PCB to be determined under its actual operating condition. With the measured impedance information, a suitable filter topology...
An accurate measurement method to extract the common mode (CM) and the differential mode (DM) noise source impedances of a switched-mode power supply (SMPS) under its operating condition is developed and validated. With a proper premeasurement calibration process, the proposed method allows extraction of both the CM and the DM noise source impedances with very good accuracy. These noise source impedances...
In the past only critical clock circuits are running at high speed but this is no longer true in today high-speed digital design world. Most of the digital traces on board are running at speed in excess of 200 MHz and drivers output with rise time less than 1 ns. Due to constraints of board size and highly complex designs, trace bends and inter-layer transitions through vias are unavoidable. This...
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