| 摘要 |
A system-on chip (SOC) ( 100 ) and method of isolating noise in a SOC, including a plurality of noise sensitive circuit blocks ( 120, 220 ) and ESD protected pads ( 302, 304, 306, 308, 310, 312, and 314 ). A VDD isolation pad ( 302 ) is connected to an N well ring ( 124 ) of the first noise sensitive circuit ( 120 ) to collect noise from the substrate ( 110 ) and isolate the circuit from the P well region ( 112 ). A ground protected pad ( 304 ) is connected to an isolated P well ( 126 ) of a first noise sensitive circuit ( 120 ). The ground pad ( 304 ) collects noise from the isolated P well ( 126 ) and sends it to ground. A dedicated ground isolation pad ( 306 ) is connected to a P well ring ( 224 ) of a second noise sensitive circuit ( 220 ). The dedicated ground isolation pad ( 306 ) collects noise from the P well ring ( 224 ) and sends it to ground. The dedicated ground isolation pad ( 306 ) and the ground pad ( 304 ) collect noise that would normally propagate between the first and second noise sensitive circuits ( 120, 220 ) and additional circuits that share the same substrate ( 110 ).
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