EDN Magazine — 11.23.94 Applying basic grounding principles keeps demons at bay (figure)

FIGURE 2

Fig 2—No matter how you create the new reference point for single-supply systems, you must ensure that this reference point doesn't move. The circuit in (a) could have problems if load ground currents mix with those of sensitive circuits. By creating two substitute grounds, the circuit in (b) keeps heavy ground currents from affecting the "clean" ground. (Courtesy Paul Brokaw, Analog Devices Inc)

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