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How to solve the problem of mutual interference from multiple sampling channels in intelligent low-voltage monitoring units?

Time：2025-12-27 Views：509次

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Multi-channel sampling crosstalk is resolved using an independent channel design. Each sampling channel uses an independent ADC channel. An RC filter (1kΩ + 100nF) is added before each analog switch. PCB layout: each sampling input is isolated, with a spacing greater than 8mm and a ground guard ring in between. A separate LDO power supply is used. Time-division sampling is implemented in the software. This design achieves crosstalk between channels of less than -70dB and independent sampling accuracy.

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