The present invention belongs to the technical field of
circuit design, and discloses a low-leakage current gating switch circuit for high-precision measurement of multiple resistors, including: diodes D1 to D7,
triode Q3, MOS transistors Q1, Q4, Q5, Q6, operational amplifiers U1, U2; the standard current input terminal is grounded through
diode D1, MOS
transistor Q1, the source
electrode of MOS
transistor Q1,
diode D3 and the
resistor under test R4, and
diode D3 is also connected to the ADC sampling terminal through MOS transistors Q5, Q4, Q6, the positive terminal of
operational amplifier U2 is connected to the standard current input terminal, the negative terminal is connected to the output terminal, and the negative terminal is also connected to MOS
transistor Q1 through diode D7 and diode D2; the positive terminal of
operational amplifier U1 is connected to the ADC sampling terminal, the negative terminal is connected to the output terminal, the output terminal is connected to diode D2 through diode D6, and the output terminal of
operational amplifier U1 is also connected to the source
electrode of MOS transistor Q6 through diode D4. The present invention can reduce the overall leakage current of the circuit to the picoampere level, greatly improving the measurement accuracy.