This floating-regulator circuit produces ±5 V floating-power-supply voltages V_CC and V_EE referenced to the test input's forcing voltage

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• Article «Fast-settling picoammeter circuit handles wide voltage range»
• Figure 1. This IVC uses a feedback-ammeter topology, which subtracts an unknown current from a feedback current and delivers an output voltage proportional to the unknown current
• Figure 2. A gain-of-three high-voltage amplifier derives forcing voltages as high as ±22 V from voltages of ±7 V from test equipment
• Figure 3. This floating-regulator circuit produces ±5 V floating-power-supply voltages V_CC and V_EE referenced to the test input's forcing voltage
• Figure 4. Over a ±20 V forcing-voltage span, the circuit produces an unloaded- output current-measurement error of -31 fA/V