Simply paralleling complementary N and P channel MOSFETs might look good but won't work beyond a few hundred mV of |V_A - V_B|

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Other Materials from the Main Document

• Article «Synthesize precision bipolar Dpot rheostats»
• Figure 1. Classic adjustable resistance; R_MAX = R_S + R_R; R_MIN = R_S
• Figure 2. Synthetic Dpot evades problems by using FET shunt, precision fixed resistors, and op-amp
• Figure 3. Simply paralleling complementary N and P channel MOSFETs might look good but won't work beyond a few hundred mV of |V_A - V_B|
• Figure 4. Two complementary anti-series FET pairs connected in parallel allow bipolar operation