To make the sensor’s output signal can be transmitted long distances

a V/I converter that converts 0

5

V input to 4

2

0 mA output is designed.Increasing the voltage follower and bias current amplifier on the basis of Howland current pump circuit.Accurate voltage and current conversion is achieved.The results of simulation and experiment indicate that the circuit can meet the requirements of the sensor’s current output

and has been successfully applied in LVDT displacement sensor conditioning circuit.