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OPA1013 and INA117 constitute of the current detection circu

2015-01-01 22:50  
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OPA1013 and INA117 constitute of the current detection circuit of the input buffer
OPA1013 and INA117 constitute of the current detection circuit of the input buffer as shown: As shown by the input buffer OPA1013 constitute a current detection circuit. In the INA117 inputs plus a buffer amplifier gain errors can make zero or common-mode rejection ratio decreased. OPA1013 can constitute a voltage follower (short R2, omit R1); may also constitute a gain inverting amplifier with a gain can be improved INA117 forward channel SNR and CMR, while allowing the sample may have a lower resistance voltage drop. Select OPA1013 op amp as a buffer allows the input and output voltage swing close to the negative supply. V0 = IRs (1 + R2/R1).